502 lines
13 KiB
C
502 lines
13 KiB
C
#include "NGCal.h"
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#include "Therm.h"
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#include "Detail.h"
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#include "FlowCal.h"
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void OFlowCal(FlowParSTRUCT * ptFlowPar,NGParSTRUCT * ptNGPar)
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{
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//大气压力转换成Pa
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double tempPatm = ptFlowPar->dPatm*1000000;
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//压力转换成Pa
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double tempPf = ptFlowPar->dPf*1000000;
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//差压转换成Pa
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double tempDP = ptFlowPar->dDp*1000;
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//温度转换成K
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double tempTf = ptFlowPar->dTf+273.15;
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if (ptFlowPar->dPfType == 0) //0是表压
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{
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ptFlowPar->dPf = tempPatm + tempPf;
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ptNGPar ->dPf=tempPatm + tempPf;
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} else {
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ptFlowPar->dPf = tempPf;
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ptNGPar->dPf=tempPf;
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}
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ptFlowPar->dDp = tempDP;
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ptFlowPar->dTf = tempTf;
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ptNGPar->dTf = tempTf;
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ptNGPar->dCbtj=ptFlowPar->dCbtj;
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switch (ptNGPar->dCbtj)
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{
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case 2:
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ptNGPar->dPb=101325;
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ptNGPar->dTb= 273.15;
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ptFlowPar->dPb_M=(101325);
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ptFlowPar->dTb_M=(273.15);
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break;
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case 1:
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ptNGPar->dPb=(101325);
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ptNGPar->dTb=( 288.15);
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ptFlowPar->dPb_M=(101325);
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ptFlowPar->dTb_M=(288.15);
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break;
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case 0:
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ptNGPar->dPb=(101325);
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ptNGPar->dTb=( 293.15);
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ptFlowPar->dPb_M=(101325);
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ptFlowPar->dTb_M=(293.15);
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break;
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}
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double ngArray[NUMBEROFCOMPONENTS];
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for (int i = 0; i <NUMBEROFCOMPONENTS; i++) {
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ngArray[i] = ptFlowPar->dNG_Compents[i] / 100;
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ptNGPar->adMixture[i] = ngArray[i];
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}
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Crit(ptNGPar,0); //计算天然气物性参数
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//开始计算孔板流量
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ptFlowPar->dFpv=ptNGPar->dFpv;
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// 1. 计算中间参数
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ptFlowPar->dOrificeD = ptFlowPar->dOrificeD * (1 + 0.000001 * CaiLiaoPzxs(ptFlowPar->dOrificeMaterial) * (ptFlowPar->dTf - 293.15));
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ptFlowPar->dPipeD = ptFlowPar->dPipeD * (1 + 0.000001 * CaiLiaoPzxs(ptFlowPar->dPipeMaterial) * (ptFlowPar->dTf - 293.15));
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ptFlowPar->dBeta = ptFlowPar->dOrificeD / ptFlowPar->dPipeD;
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ptFlowPar->dE = calculateE(ptFlowPar->dBeta);
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ptFlowPar->dFG = calculateFG(ptNGPar->dRD_Real);
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ptFlowPar->dFT = calculateFT(ptFlowPar->dTb_M, ptFlowPar->dTf);
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ptFlowPar->dKappa = calculateKappa(ptNGPar->dZf);
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ptFlowPar->dDViscosity = Dlndjs(ptFlowPar->dPf/1e6, ptFlowPar->dTf);
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ptFlowPar->dDExpCoefficient = calculateEpsilon(ptFlowPar->dPf, ptFlowPar->dDp,
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ptFlowPar->dBeta, ptFlowPar->dKappa);
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double D = ptFlowPar->dPipeD / 1000.0; // 管道内径(m)
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double d = ptFlowPar->dOrificeD / 1000.0; // 孔板孔径(m)
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double beta = ptFlowPar->dBeta;
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double P1 = ptFlowPar->dPf; // 绝对压力(Pa)
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double deltaP = ptFlowPar->dDp; // 差压(Pa)
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double Tf = ptFlowPar->dTf;
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// 2. 初始雷诺数估算（假设初始C=0.6）
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double C_initial = 0.6;
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double Qf_initial = (C_initial * ptFlowPar->dE * ptFlowPar->dDExpCoefficient * M_PI * pow(d, 2) / 4)
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* sqrt(2 * deltaP / (ptNGPar->dRhof * (1 - pow(beta, 4))));
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ptFlowPar->dVFlowf = Qf_initial; // 初始工况流量(m3/s)
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// 3. 迭代参数
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double tolerance = 1e-6;
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int maxIter = 100;
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double currentC = C_initial;
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double currentReD = calculateReD(Qf_initial, D, ptNGPar->dRhof, ptFlowPar->dDViscosity);
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int iter = 0;
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double prevC = 0;
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// 4. 迭代循环
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do {
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prevC = currentC;
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// 4.1 计算流出系数C（GB/T 21446-2008 附录A）
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currentC = calculateCd(beta, currentReD, ptFlowPar->dPipeD, ptFlowPar->dPtmode);
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// 4.2 更新流量
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double Qf = (currentC * ptFlowPar->dDExpCoefficient * M_PI * pow(d, 2) / 4)
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* sqrt(2 * deltaP / (ptNGPar->dRhof * (1 - pow(beta, 4))));
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ptFlowPar->dVFlowf = Qf;
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// 4.3 更新雷诺数
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currentReD = calculateReD(Qf, D, ptNGPar->dRhof, ptFlowPar->dDViscosity);
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iter++;
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if (iter > maxIter) {
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fprintf(stderr, "迭代未收敛，超过最大迭代次数！\n");
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}
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} while (fabs(currentC - prevC) / currentC > tolerance);
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// 5. 保存最终结果
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// 在迭代计算流出系数后，添加粗糙度修正
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double K = calculateK(ptFlowPar->dPipeType); // 根据实际管道类型选择
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double G_me = calculateRoughnessFactor(ptFlowPar->dPipeD, K, currentC);
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double C_corrected = currentC * G_me;
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ptFlowPar->dCd = C_corrected;
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ptFlowPar->dRoughNessPipe = G_me;
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ptFlowPar->dRnPipe = currentReD;
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// 6. 计算标况流量（GB/T 21446-2008 式(1)）
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double Qn = ptFlowPar->dVFlowf * (ptFlowPar->dFpv * ptFlowPar->dFpv * P1 / ptFlowPar->dPb_M)
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* (ptFlowPar->dTb_M) / Tf;
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ptFlowPar->dVFlowb = Qn;
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// 标况质量流量
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ptFlowPar->dMFlowb = ptFlowPar->dVFlowb * ptNGPar->dRhob;
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// 标况能量流量
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ptFlowPar->dEFlowb = ptFlowPar->dVFlowb * ptNGPar->dHhvMol;
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// 管道内天然气流速
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ptFlowPar->dVelocityFlow = ptFlowPar->dVFlowf / (M_PI * pow((ptFlowPar->dPipeD / 2000), 2));
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}
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/// <summary>
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/// 材料膨胀系数计算
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/// </summary>
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/// <param name="tempCaiLiao"></param>
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/// <returns></returns>
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double CaiLiaoPzxs(int tempCaiLiao)
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{
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double CaiLiaoPzxs = 0;
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// 孔板和管道材料的膨胀系数
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// 0 A3、15号钢
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// 1 10 号钢
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// 2 20 号钢
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// 3 45 号钢
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// 4 1 Cr13?2Cr13
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// 5 Cr17
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// 6 12 CrMoV
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// 7 10 CrMo910
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// 8 Cr6SiMo
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// 9 X20CrMoV121
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// 10 1 Cr18Ni9Ti
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// 11 普通碳钢
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// 12 工业用铜
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// 13 黄铜
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// 14 红铜
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switch (tempCaiLiao)
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{
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case 0:
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CaiLiaoPzxs = 11.75;
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break;
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case 1:
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CaiLiaoPzxs = 11.6;
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break;
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case 2:
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CaiLiaoPzxs = 11.16;
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break;
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case 3:
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CaiLiaoPzxs = 11.59;
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break;
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case 4:
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CaiLiaoPzxs = 10.5;
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break;
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case 5:
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CaiLiaoPzxs = 10.0;
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break;
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case 6:
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CaiLiaoPzxs = 10.2;
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break;
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case 7:
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CaiLiaoPzxs = 15.5;
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break;
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case 8:
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CaiLiaoPzxs = 11.5;
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break;
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case 9:
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CaiLiaoPzxs = 10.8;
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break;
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case 10:
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CaiLiaoPzxs = 16.6;
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break;
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case 11:
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CaiLiaoPzxs = 11.4;
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break;
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case 12:
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CaiLiaoPzxs = 16.55;
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break;
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case 13:
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CaiLiaoPzxs = 17.8;
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break;
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case 14:
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CaiLiaoPzxs = 17.2;
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break;
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}
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return CaiLiaoPzxs;
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}
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/**
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* 计算管道绝对粗糙度 K (GB/T 21446-2008 附录C)
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* @param dPipeType 管道类型
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* @return 粗糙度修正系数 K (保留4位小数)
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*/
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double calculateK(int dPipeType) {
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double Jdccd;
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switch (dPipeType) {
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case 0:
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Jdccd = 0.029;
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break;
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case 1:
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case 2:
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case 3:
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Jdccd = 0.075;
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break;
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case 4:
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Jdccd = 0.1;
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break;
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case 5:
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Jdccd = 0.15;
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break;
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case 6:
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Jdccd = 1;
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break;
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case 7:
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Jdccd = 2.1;
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break;
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case 8:
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Jdccd = 0.04;
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break;
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case 9:
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Jdccd = 0.15;
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break;
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case 10:
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Jdccd = 0.13;
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break;
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case 11:
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Jdccd = 0.25;
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break;
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default:
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// 处理未知类型（可选）
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fprintf(stderr, "未知的管道类型: %d\n", dPipeType);
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return FLOW_CALC_ERROR;
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}
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return Jdccd;
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}
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/**
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* 计算管道粗糙度修正系数 G_me (GB/T 21446-2008 附录C)
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* @param D_pipe 管道内径 (mm)
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* @param K 绝对粗糙度 (mm)
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* @param C 未修正的流出系数
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* @return 粗糙度修正系数 G_me (保留4位小数)
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*/
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double calculateRoughnessFactor(double D_pipe, double K, double C) {
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// 计算相对粗糙度 K/D
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double K_over_D = K / D_pipe;
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// 判断是否需要修正
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if (K_over_D <= 0.0004) {
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return 1.0000;
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}
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// 计算修正项
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double term = (K_over_D * 1e6) - 400; // 转换为无量纲项
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if (term < 0) {
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fprintf(stderr, "K/D 超出修正公式适用范围\n");
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return FLOW_CALC_ERROR;
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}
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double G_me = 1 + (0.011 / C) * sqrt(term);
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return G_me; // 保留四位小数
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}
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/**
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* 计算渐近速度系数E（GB/T 21446-2008 式(8)）
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* @param beta 直径比
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* @return 渐近速度系数E
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*/
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double calculateE(double beta) {
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return 1 / sqrt(1 - pow(beta, 4));
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}
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/**
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* 计算相对密度系数FG（GB/T 21446-2008 式(9)）
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* @param dRD_Real 真实相对密度
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* @return 相对密度系数FG
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*/
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double calculateFG(double dRD_Real) {
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return 1 / sqrt(dRD_Real);
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}
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/**
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* 计算流动温度系数FT（GB/T 21446-2008 式(10)）
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* @param dTb_M 参比温度(K)
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* @param dTf 工况温度(K)
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* @return 流动温度系数FT
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*/
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double calculateFT(double dTb_M, double dTf) {
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return sqrt(dTb_M / dTf);
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}
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/**
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* 计算可膨胀系数ε（GB/T 21446-2008 式(11)）
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* @param dPf 上游绝对压力(Pa)
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* @param dDp 差压(Pa)
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* @param beta 直径比
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* @param dKappa 等熵指数
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* @return 可膨胀系数ε
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*/
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double calculateEpsilon(double dPf, double dDp, double beta, double dKappa) {
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double tau = (dPf - dDp) / dPf; // 压力比
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double epsilon = 1 - (0.351 + 0.256 * pow(beta, 4) + 0.93 * pow(beta, 8)) * (1 - pow(tau, 1/dKappa));
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return epsilon;
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}
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/**
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* 计算等熵指数κ（GB/T 21446-2008 推荐方法）
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* @param dZf 工况压缩因子
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* @return 等熵指数κ
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*/
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double calculateKappa(double dZf) {
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// 近似公式：基于理想气体比热比和压缩因子修正
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double gamma = 1.3; // 天然气典型比热比（Cp/Cv≈1.3）
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double Z = dZf; // 工况压缩因子
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// 修正公式（经验关系）
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double kappa = gamma / (1 - (gamma - 1) * (1 / Z - 1));
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return kappa;
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}
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/**
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* 计算雷诺数ReD（GB/T 21446-2008 式(5)）
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* @param Qf 工况流量(m3/s)
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* @param D 管道内径(m)
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* @param rho 密度(kg/m3)
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* @param mu 动力粘度(Pa·s)
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* @return 雷诺数
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*/
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double calculateReD(double Qf, double D, double rho, double mu) {
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return (4 * Qf * rho) / (M_PI * D * mu);
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}
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/**
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* 计算流出系数C（GB/T 21446-2008 附录A）
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* @param beta 直径比
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* @param ReD 雷诺数
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* @param D_mm 管道内径(mm)
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* @param ptMode 取压方式
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* @return 流出系数C
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*/
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double calculateCd(double beta, double ReD, double D_mm, int ptMode) {
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double L1, L2;
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// 根据取压方式确定L1/L2（角接取压）
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switch (ptMode) {
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case 1: // 角接取压
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L1 = L2 = 0; // D单位为mm
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break;
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case 0: // 法兰取压
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L1 = L2 = 25.4 / D_mm;
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break;
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case 2: // D-D/2取压
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L1 = 1.0;
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L2 = 0.47;
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break;
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default:
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fprintf(stderr, "不支持的取压方式: %d\n", ptMode);
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return FLOW_CALC_ERROR;
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}
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double term1 = 0.5961 + 0.0261 * pow(beta, 2) - 0.216 * pow(beta, 8);
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double term2 = 0.000521 * pow(1e6 * beta / ReD, 0.7);
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double A = pow(19000 * beta / ReD, 0.8);
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double term3 = (0.0188 + 0.0063 * A) * pow(beta, 3.5) * pow(1e6 / ReD, 0.3);
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double term4 = (0.043 + 0.08 * exp(-10 * L1) - 0.123 * exp(-7 * L1))
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* (1 - 0.11 * A) * pow(beta, 4) / (1 - pow(beta, 4));
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double term5 = -0.031 * (2 * L2 / (1 - beta) - 0.8 * pow(2 * L2 / (1 - beta), 1.1))
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* pow(beta, 1.3);
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double Cd = term1 + term2 + term3 + term4 + term5;
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// 孔径<71.12mm修正
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if (D_mm < 71.12) {
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Cd += 0.011 * (0.75 - beta) * (2.8 - D_mm / 25.4);
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}
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return Cd;
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}
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/**
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* 查表计算粘度μ
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* @param tempP_jy 压力(MPa)
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* @param tempT 温度(K)
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* @return 动力粘度(Pa·s)
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*/
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double Dlndjs(double tempP_jy, double tempT) {
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double Dlndjs_Dlnd_Data[8][11] = {
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{976, 991, 1014, 1044, 1073, 1114, 1156, 1207, 1261, 1331, 1405},
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{1027, 1040, 1063, 1091, 1118, 1151, 1185, 1230, 1276, 1331, 1389},
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{1071, 1082, 1106, 1127, 1149, 1180, 1211, 1250, 1289, 1335, 1383},
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{1123, 1135, 1153, 1174, 1195, 1224, 1253, 1289, 1324, 1366, 1409},
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{1167, 1178, 1196, 1216, 1236, 1261, 1287, 1318, 1350, 1385, 1421},
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{1213, 1224, 1239, 1257, 1275, 1297, 1320, 1346, 1373, 1403, 1435},
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{1260, 1270, 1281, 1297, 1313, 1333, 1352, 1374, 1396, 1424, 1451},
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{1303, 1312, 1323, 1338, 1352, 1372, 1391, 1412, 1432, 1456, 1482}
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};
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double Dlndjs_Dlnd_T[8] = {
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-15 + 273.15, 0 + 273.15, 15 + 273.15, 30 + 273.15,
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45 + 273.15, 60 + 273.15, 75 + 273.15, 90 + 273.15
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||
};
|
||
|
||
double Dlndjs_Dlnd_P[11] = {0.1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
|
||
|
||
double s1, s2, ky, kx;
|
||
int i, m = 0, n = 0;
|
||
|
||
if (tempT < Dlndjs_Dlnd_T[0]) {
|
||
tempT = Dlndjs_Dlnd_T[0];
|
||
}
|
||
if (tempT > Dlndjs_Dlnd_T[7]) {
|
||
tempT = Dlndjs_Dlnd_T[7];
|
||
}
|
||
if (tempP_jy < Dlndjs_Dlnd_P[0]) {
|
||
tempP_jy = Dlndjs_Dlnd_P[0];
|
||
}
|
||
if (tempP_jy > Dlndjs_Dlnd_P[10]) {
|
||
tempP_jy = Dlndjs_Dlnd_P[10];
|
||
}
|
||
|
||
for (i = 0; i <= 6; i++) {
|
||
if (tempT >= Dlndjs_Dlnd_T[i] && tempT <= Dlndjs_Dlnd_T[i + 1]) {
|
||
m = i;
|
||
break;
|
||
}
|
||
}
|
||
|
||
for (i = 0; i <= 9; i++) {
|
||
if (tempP_jy >= Dlndjs_Dlnd_P[i] && tempP_jy <= Dlndjs_Dlnd_P[i + 1]) {
|
||
n = i;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (Dlndjs_Dlnd_P[n + 1] - Dlndjs_Dlnd_P[n] != 0) {
|
||
ky = (tempP_jy - Dlndjs_Dlnd_P[n]) / (Dlndjs_Dlnd_P[n + 1] - Dlndjs_Dlnd_P[n]);
|
||
} else {
|
||
ky = 0;
|
||
}
|
||
|
||
if (Dlndjs_Dlnd_T[m + 1] - Dlndjs_Dlnd_T[m] != 0) {
|
||
kx = (tempT - Dlndjs_Dlnd_T[m]) / (Dlndjs_Dlnd_T[m + 1] - Dlndjs_Dlnd_T[m]);
|
||
} else {
|
||
kx = 0;
|
||
}
|
||
|
||
s1 = Dlndjs_Dlnd_Data[m][n] + (Dlndjs_Dlnd_Data[m][n + 1] - Dlndjs_Dlnd_Data[m][n]) * ky;
|
||
s2 = Dlndjs_Dlnd_Data[m + 1][n] + (Dlndjs_Dlnd_Data[m + 1][n + 1] - Dlndjs_Dlnd_Data[m + 1][n]) * ky;
|
||
return (s1 + (s2 - s1) * kx) / 100000.0;
|
||
}
|