GasFlowMeter/User/NG/OFlowCal.c

#include "NGCal.h" 
#include "Therm.h" 
#include "Detail.h"
#include "FlowCal.h"
#include "math.h"

void OFlowCal(FlowParSTRUCT * ptFlowPar,NGParSTRUCT * ptNGPar)
{	

		//<2F><><EFBFBD><EFBFBD>ѹ<EFBFBD><D1B9>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>Pa
		double tempPatm =  ptFlowPar->dPatm*1000000;
		//ѹ<><D1B9>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>Pa
		double tempPf =  ptFlowPar->dPf*1000000;

		//<2F><>ѹת<D1B9><D7AA><EFBFBD><EFBFBD>Pa
		double tempDP = ptFlowPar->dDp*1000;
		//<2F>¶<EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>K
		double tempTf = ptFlowPar->dTf+273.15;

		if (ptFlowPar->dPfType == 0)  //0<>DZ<EFBFBD>ѹ
		{
			ptFlowPar->dPf = tempPatm + tempPf;
			ptNGPar ->dPf=tempPatm + tempPf;
		} else {
			ptFlowPar->dPf = tempPf;
			ptNGPar->dPf=tempPf;
		}

		ptFlowPar->dDp = tempDP;
		ptFlowPar->dTf = tempTf;
		ptNGPar->dTf = tempTf;
		ptNGPar->dCbtj=ptFlowPar->dCbtj;
				
		  switch (ptNGPar->dCbtj)
        {
            case 2:
                ptNGPar->dPb=101325;
                ptNGPar->dTb= 273.15;
                ptFlowPar->dPb_M=(101325);
                ptFlowPar->dTb_M=(273.15);
                break;
            case 1:

                ptNGPar->dPb=(101325);
                ptNGPar->dTb=( 288.15);
                ptFlowPar->dPb_M=(101325);
                ptFlowPar->dTb_M=(288.15);
                break;
            case 0:

                ptNGPar->dPb=(101325);
                ptNGPar->dTb=( 293.15);
                ptFlowPar->dPb_M=(101325);
                ptFlowPar->dTb_M=(293.15);
                break;
        }
				
				double ngArray[NUMBEROFCOMPONENTS];
				
			 for (int i = 0; i <NUMBEROFCOMPONENTS; i++) {
          
          ngArray[i] = ptFlowPar->dNG_Compents[i] / 100;
				 	ptNGPar->adMixture[i] =	ngArray[i];
           
        }
			 Crit(ptNGPar,0);  //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><C8BB><EFBFBD><EFBFBD><EFBFBD>Բ<EFBFBD><D4B2><EFBFBD>  
				
				//<2F><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>װ<EFBFBD><D7B0><EFBFBD><EFBFBD><EFBFBD>
				ptFlowPar->dFpv=ptNGPar->dFpv;
				
				// 1. <20><><EFBFBD><EFBFBD><EFBFBD>м<EFBFBD><D0BC><EFBFBD><EFBFBD>
				
		ptFlowPar->dOrificeD = ptFlowPar->dOrificeD * (1 + 0.000001 * CaiLiaoPzxs(ptFlowPar->dOrificeMaterial) * (ptFlowPar->dTf - 293.15));
		ptFlowPar->dPipeD = ptFlowPar->dPipeD * (1 + 0.000001 * CaiLiaoPzxs(ptFlowPar->dPipeMaterial) * (ptFlowPar->dTf - 293.15));
		ptFlowPar->dBeta = ptFlowPar->dOrificeD / ptFlowPar->dPipeD;
				
    ptFlowPar->dE = calculateE(ptFlowPar->dBeta);
    ptFlowPar->dFG = calculateFG(ptNGPar->dRD_Real);
    ptFlowPar->dFT = calculateFT(ptFlowPar->dTb_M, ptFlowPar->dTf);

    ptFlowPar->dKappa = calculateKappa(ptNGPar->dZf);
    ptFlowPar->dDViscosity = Dlndjs(ptFlowPar->dPf/1e6, ptFlowPar->dTf);
    ptFlowPar->dDExpCoefficient = calculateEpsilon(ptFlowPar->dPf, ptFlowPar->dDp, 
                                                 ptFlowPar->dBeta, ptFlowPar->dKappa);
				
		 double D = ptFlowPar->dPipeD / 1000.0;   // <20>ܵ<EFBFBD><DCB5>ھ<EFBFBD>(m)
    double d = ptFlowPar->dOrificeD / 1000.0; // <20>װ<EFBFBD>׾<EFBFBD>(m)
    double beta = ptFlowPar->dBeta;
    double P1 = ptFlowPar->dPf;             // <20><><EFBFBD><EFBFBD>ѹ<EFBFBD><D1B9>(Pa)
    double deltaP = ptFlowPar->dDp;         // <20><>ѹ(Pa)
    double Tf = ptFlowPar->dTf;    
		
	// 2. <20><>ʼ<EFBFBD><CABC>ŵ<EFBFBD><C5B5><EFBFBD><EFBFBD><EFBFBD>㣨<EFBFBD><E3A3A8><EFBFBD><EFBFBD><EFBFBD>ʼC=0.6<EFBFBD><EFBFBD>
    double C_initial = 0.6;
    double Qf_initial = (C_initial * ptFlowPar->dE * ptFlowPar->dDExpCoefficient * M_PI * pow(d, 2) / 4)
            * sqrt(2 * deltaP / (ptNGPar->dRhof * (1 - pow(beta, 4))));
    ptFlowPar->dVFlowf = Qf_initial; // <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(m3/s)

    // 3. <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    double tolerance = 1e-6;
    int maxIter = 100;
    double currentC = C_initial;
    double currentReD = calculateReD(Qf_initial, D, ptNGPar->dRhof, ptFlowPar->dDViscosity);
    int iter = 0;
    double prevC = 0;

    // 4. <20><><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD>
    do {
        prevC = currentC;

        // 4.1 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><CFB5>C<EFBFBD><43>GB/T 21446-2008 <20><>¼A<C2BC><41>
        currentC = calculateCd(beta, currentReD, ptFlowPar->dPipeD, ptFlowPar->dPtmode);

        // 4.2 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        double Qf = (currentC * ptFlowPar->dDExpCoefficient * M_PI * pow(d, 2) / 4)
                * sqrt(2 * deltaP / (ptNGPar->dRhof * (1 - pow(beta, 4))));
        ptFlowPar->dVFlowf = Qf;

        // 4.3 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD><C5B5>
        currentReD = calculateReD(Qf, D, ptNGPar->dRhof, ptFlowPar->dDViscosity);

        iter++;
        if (iter > maxIter) {
            fprintf(stderr, "<EFBFBD><EFBFBD><EFBFBD><EFBFBD>δ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>\n");             
        }
    } while (fabs(currentC - prevC) / currentC > tolerance);

    // 5. <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ս<EFBFBD><D5BD>
    // <20>ڵ<EFBFBD><DAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><CFB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӵֲڶ<D6B2><DAB6><EFBFBD><EFBFBD><EFBFBD>
    double K = calculateK(ptFlowPar->dPipeType); // <20><><EFBFBD><EFBFBD>ʵ<EFBFBD>ʹܵ<CAB9><DCB5><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><D1A1>
    double G_me = calculateRoughnessFactor(ptFlowPar->dPipeD, K, currentC);
    double C_corrected = currentC * G_me;

    ptFlowPar->dCd = C_corrected;
    ptFlowPar->dRoughNessPipe = G_me;
    ptFlowPar->dRnPipe = currentReD;

    // 6. <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>GB/T 21446-2008 ʽ(1)<29><>
    double Qn = ptFlowPar->dVFlowf * (ptFlowPar->dFpv * ptFlowPar->dFpv * P1 / ptFlowPar->dPb_M)
            * (ptFlowPar->dTb_M) / Tf;
    ptFlowPar->dVFlowb = Qn;

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    ptFlowPar->dMFlowb = ptFlowPar->dVFlowb * ptNGPar->dRhob;
    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    ptFlowPar->dEFlowb = ptFlowPar->dVFlowb * ptNGPar->dHhvMol;
    // <20>ܵ<EFBFBD><DCB5><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><C8BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    ptFlowPar->dVelocityFlow = ptFlowPar->dVFlowf / (M_PI * pow((ptFlowPar->dPipeD / 2000), 2));
    
}

/// <summary>
/// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><CFB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
/// </summary>
/// <param name="tempCaiLiao"></param>
/// <returns></returns>
 double CaiLiaoPzxs(int tempCaiLiao)
{
  double CaiLiaoPzxs = 0;
  // <20>װ<EFBFBD>͹ܵ<CDB9><DCB5><EFBFBD><EFBFBD>ϵ<EFBFBD><CFB5><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><CFB5>
  // 0 A3<41><33>15<31>Ÿ<EFBFBD>
  // 1 10 <20>Ÿ<EFBFBD>
  // 2 20 <20>Ÿ<EFBFBD>
  // 3 45 <20>Ÿ<EFBFBD>
  // 4 1 Cr13?2Cr13
  // 5 Cr17
  // 6 12 CrMoV
  // 7 10 CrMo910
  // 8 Cr6SiMo
  // 9 X20CrMoV121
  // 10 1 Cr18Ni9Ti
  // 11 <20><>̼ͨ<CDA8><CCBC>
  // 12 <20><>ҵ<EFBFBD><D2B5>ͭ
  // 13 <20><>ͭ
  // 14 <20><>ͭ
  switch (tempCaiLiao)
  {
    case 0:
      CaiLiaoPzxs = 11.75;
      break;

    case 1:
      CaiLiaoPzxs = 11.6;
      break;

    case 2:
      CaiLiaoPzxs = 11.16;
      break;

    case 3:
      CaiLiaoPzxs = 11.59;
      break;

    case 4:
      CaiLiaoPzxs = 10.5;
      break;

    case 5:
      CaiLiaoPzxs = 10.0;
      break;

    case 6:
      CaiLiaoPzxs = 10.2;
      break;

    case 7:
      CaiLiaoPzxs = 15.5;
      break;

    case 8:
      CaiLiaoPzxs = 11.5;
      break;

    case 9:
      CaiLiaoPzxs = 10.8;
      break;

    case 10:
      CaiLiaoPzxs = 16.6;
      break;

    case 11:
      CaiLiaoPzxs = 11.4;
      break;

    case 12:
      CaiLiaoPzxs = 16.55;
      break;

    case 13:
      CaiLiaoPzxs = 17.8;
      break;

    case 14:
      CaiLiaoPzxs = 17.2;
      break;
  }
  return CaiLiaoPzxs;
}
/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դֲڶ<EFBFBD> K (GB/T 21446-2008 <EFBFBD><EFBFBD>¼C)
 * @param dPipeType <EFBFBD>ܵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * @return <EFBFBD>ֲڶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD> K (<EFBFBD><EFBFBD><EFBFBD><EFBFBD>4λС<EFBFBD><EFBFBD>)
 */
double calculateK(int dPipeType) {
    double Jdccd;
    switch (dPipeType) {
        case 0:
            Jdccd = 0.029;
            break;
        case 1:
        case 2:
        case 3:
            Jdccd = 0.075;
            break;
        case 4:
            Jdccd = 0.1;
            break;
        case 5:
            Jdccd = 0.15;
            break;
        case 6:
            Jdccd = 1;
            break;
        case 7:
            Jdccd = 2.1;
            break;
        case 8:
            Jdccd = 0.04;
            break;
        case 9:
            Jdccd = 0.15;
            break;
        case 10:
            Jdccd = 0.13;
            break;
        case 11:
            Jdccd = 0.25;
            break;
        default:
            // <20><><EFBFBD><EFBFBD>δ֪<CEB4><D6AA><EFBFBD>ͣ<EFBFBD><CDA3><EFBFBD>ѡ<EFBFBD><D1A1>
            fprintf(stderr, "δ֪<EFBFBD>Ĺܵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: %d\n", dPipeType);
          return FLOW_CALC_ERROR;
    }
    return Jdccd;
}


/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܵ<EFBFBD><EFBFBD>ֲڶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD> G_me (GB/T 21446-2008 <EFBFBD><EFBFBD>¼C)
 * @param D_pipe <EFBFBD>ܵ<EFBFBD><EFBFBD>ھ<EFBFBD> (mm)
 * @param K <EFBFBD><EFBFBD><EFBFBD>Դֲڶ<EFBFBD> (mm)
 * @param C δ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD>
 * @return <EFBFBD>ֲڶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD> G_me (<EFBFBD><EFBFBD><EFBFBD><EFBFBD>4λС<EFBFBD><EFBFBD>)
 */
double calculateRoughnessFactor(double D_pipe, double K, double C) {
    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Դֲڶ<D6B2> K/D
    double K_over_D = K / D_pipe;

    // <20>ж<EFBFBD><D0B6>Ƿ<EFBFBD><C7B7><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>
    if (K_over_D <= 0.0004) {
        return 1.0000;
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    double term = (K_over_D * 1e6) - 400; // ת<><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    if (term < 0) {
        fprintf(stderr, "K/D <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD><CABD><EFBFBD>÷<EFBFBD>Χ\n");
     return FLOW_CALC_ERROR;
    }

    double G_me = 1 + (0.011 / C) * sqrt(term);
    return G_me; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λС<CEBB><D0A1>
}



/**
 * <EFBFBD><EFBFBD><EFBFBD>㽥<EFBFBD><EFBFBD><EFBFBD>ٶ<EFBFBD>ϵ<EFBFBD><EFBFBD>E<EFBFBD><EFBFBD>GB/T 21446-2008 ʽ(8)<EFBFBD><EFBFBD>
 * @param beta ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ٶ<EFBFBD>ϵ<EFBFBD><EFBFBD>E
 */
double calculateE(double beta) {
    return 1 / sqrt(1 - pow(beta, 4));
}

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܶ<EFBFBD>ϵ<EFBFBD><EFBFBD>FG<EFBFBD><EFBFBD>GB/T 21446-2008 ʽ(9)<EFBFBD><EFBFBD>
 * @param dRD_Real <EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܶ<EFBFBD>
 * @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܶ<EFBFBD>ϵ<EFBFBD><EFBFBD>FG
 */
double calculateFG(double dRD_Real) {
    return 1 / sqrt(dRD_Real);
}

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¶<EFBFBD>ϵ<EFBFBD><EFBFBD>FT<EFBFBD><EFBFBD>GB/T 21446-2008 ʽ(10)<EFBFBD><EFBFBD>
 * @param dTb_M <EFBFBD>α<EFBFBD><EFBFBD>¶<EFBFBD>(K)
 * @param dTf <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¶<EFBFBD>(K)
 * @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¶<EFBFBD>ϵ<EFBFBD><EFBFBD>FT
 */
double calculateFT(double dTb_M, double dTf) {
    return sqrt(dTb_M / dTf);
}

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD>ţ<EFBFBD>GB/T 21446-2008 ʽ(11)<EFBFBD><EFBFBD>
 * @param dPf <EFBFBD><EFBFBD><EFBFBD>ξ<EFBFBD><EFBFBD><EFBFBD>ѹ<EFBFBD><EFBFBD>(Pa)
 * @param dDp <EFBFBD><EFBFBD>ѹ(Pa)
 * @param beta ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * @param dKappa <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>
 * @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 */
double calculateEpsilon(double dPf, double dDp, double beta, double dKappa) {
    double tau = (dPf - dDp) / dPf;         // ѹ<><D1B9><EFBFBD><EFBFBD>
    double epsilon = 1 - (0.351 + 0.256 * pow(beta, 4) + 0.93 * pow(beta, 8)) * (1 - pow(tau, 1/dKappa));
    return epsilon;
}

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ʣ<EFBFBD>GB/T 21446-2008 <EFBFBD>Ƽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * @param dZf <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 */
double calculateKappa(double dZf) {
    // <20><><EFBFBD>ƹ<EFBFBD>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȱȺ<C8B1>ѹ<EFBFBD><D1B9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    double gamma = 1.3; // <20><>Ȼ<EFBFBD><C8BB><EFBFBD><EFBFBD><EFBFBD>ͱ<EFBFBD><CDB1>ȱȣ<C8B1>Cp/Cv<43><76>1.3<EFBFBD><EFBFBD>
    double Z = dZf; // <20><><EFBFBD><EFBFBD>ѹ<EFBFBD><D1B9><EFBFBD><EFBFBD><EFBFBD><EFBFBD>

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><CFB5>
    double kappa = gamma / (1 - (gamma - 1) * (1 / Z - 1));
    return kappa;
}

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD><EFBFBD>ReD<EFBFBD><EFBFBD>GB/T 21446-2008 ʽ(5)<EFBFBD><EFBFBD>
 * @param Qf <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(m3/s)
 * @param D <EFBFBD>ܵ<EFBFBD><EFBFBD>ھ<EFBFBD>(m)
 * @param rho <EFBFBD>ܶ<EFBFBD>(kg/m3)
 * @param mu <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ճ<EFBFBD><EFBFBD>(Pa<EFBFBD><EFBFBD>s)
 * @return <EFBFBD><EFBFBD>ŵ<EFBFBD><EFBFBD>
 */
double calculateReD(double Qf, double D, double rho, double mu) {
    return (4 * Qf * rho) / (M_PI * D * mu);
}

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD>C<EFBFBD><EFBFBD>GB/T 21446-2008 <EFBFBD><EFBFBD>¼A<EFBFBD><EFBFBD>
 * @param beta ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * @param ReD <EFBFBD><EFBFBD>ŵ<EFBFBD><EFBFBD>
 * @param D_mm <EFBFBD>ܵ<EFBFBD><EFBFBD>ھ<EFBFBD>(mm)
 * @param ptMode ȡѹ<EFBFBD><EFBFBD>ʽ
 * @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><EFBFBD>C
 */
double calculateCd(double beta, double ReD, double D_mm, int ptMode) {
    double L1, L2;
    // <20><><EFBFBD><EFBFBD>ȡѹ<C8A1><D1B9>ʽȷ<CABD><C8B7>L1/L2<4C><32><EFBFBD>ǽ<EFBFBD>ȡѹ<C8A1><D1B9>
    switch (ptMode) {
        case 1: // <20>ǽ<EFBFBD>ȡѹ
            L1 = L2 = 0; // D<><44>λΪmm
            break;
        case 0: // <20><><EFBFBD><EFBFBD>ȡѹ
            L1 = L2 = 25.4 / D_mm;
            break;
        case 2: // D-D/2ȡѹ
            L1 = 1.0;
            L2 = 0.47;
            break;
        default:
            fprintf(stderr, "<EFBFBD><EFBFBD>֧<EFBFBD>ֵ<EFBFBD>ȡѹ<EFBFBD><EFBFBD>ʽ: %d\n", ptMode);
            return FLOW_CALC_ERROR;
    }

    double term1 = 0.5961 + 0.0261 * pow(beta, 2) - 0.216 * pow(beta, 8);
    double term2 = 0.000521 * pow(1e6 * beta / ReD, 0.7);
    double A = pow(19000 * beta / ReD, 0.8);
    double term3 = (0.0188 + 0.0063 * A) * pow(beta, 3.5) * pow(1e6 / ReD, 0.3);
    double term4 = (0.043 + 0.08 * exp(-10 * L1) - 0.123 * exp(-7 * L1))
            * (1 - 0.11 * A) * pow(beta, 4) / (1 - pow(beta, 4));
    double term5 = -0.031 * (2 * L2 / (1 - beta) - 0.8 * pow(2 * L2 / (1 - beta), 1.1))
            * pow(beta, 1.3);

    double Cd = term1 + term2 + term3 + term4 + term5;

    // <20>׾<EFBFBD><71.12mm<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    if (D_mm < 71.12) {
        Cd += 0.011 * (0.75 - beta) * (2.8 - D_mm / 25.4);
    }
    return Cd;
}

/**
 * <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ճ<EFBFBD>Ȧ<EFBFBD>
 * @param tempP_jy ѹ<EFBFBD><EFBFBD>(MPa)
 * @param tempT <EFBFBD>¶<EFBFBD>(K)
 * @return <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ճ<EFBFBD><EFBFBD>(Pa<EFBFBD><EFBFBD>s)
 */
double Dlndjs(double tempP_jy, double tempT) {
    double Dlndjs_Dlnd_Data[8][11] = {
        {976, 991, 1014, 1044, 1073, 1114, 1156, 1207, 1261, 1331, 1405},
        {1027, 1040, 1063, 1091, 1118, 1151, 1185, 1230, 1276, 1331, 1389},
        {1071, 1082, 1106, 1127, 1149, 1180, 1211, 1250, 1289, 1335, 1383},
        {1123, 1135, 1153, 1174, 1195, 1224, 1253, 1289, 1324, 1366, 1409},
        {1167, 1178, 1196, 1216, 1236, 1261, 1287, 1318, 1350, 1385, 1421},
        {1213, 1224, 1239, 1257, 1275, 1297, 1320, 1346, 1373, 1403, 1435},
        {1260, 1270, 1281, 1297, 1313, 1333, 1352, 1374, 1396, 1424, 1451},
        {1303, 1312, 1323, 1338, 1352, 1372, 1391, 1412, 1432, 1456, 1482}
    };
    
    double Dlndjs_Dlnd_T[8] = {
        -15 + 273.15, 0 + 273.15, 15 + 273.15, 30 + 273.15,
        45 + 273.15, 60 + 273.15, 75 + 273.15, 90 + 273.15
    };
    
    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;
}