音速喷嘴流出系数曲线对比图

import math
import matplotlib.pyplot as plt

# list=[0.001,0.002,0.003,0.004,0.005,0.006,0.007,0.008,0.009];
# for i in list:
#     re = 1/i**2;
#     print(str(i)+":"+str(re));
#
# Re=2.09*10**6;
# res =1/math.sqrt(Re);
# print(res)

#MODEL 1 2 3
#1 ISO
#2 NMIJ-2013
#3 NIM-2016
# MODEL = 3;
#test point
p1Re = 1.06*math.pow(10,6);
p2Re = 3.5*math.pow(10,6);

Cd1 = [];
Cd2 = [];
Cd3 = [];
Cd4 = [];
Cd5 = [];

stepLen = 1000;

start = math.pow(10,5);
end = math.pow(10,7);

start2 = 2.1*math.pow(10,4);
end2 = 1.2*math.pow(10,6);
count = (end - start)/stepLen;  # len = 9900000  count = 9900
print("count="+str(count));

count2 = (end2 - start2)/stepLen;  # len = 9900000  count = 9900
print("count2="+str(count2));

Re2 = [];
for i in range(int(count2)):
    reVal = start2 + i * stepLen;

    Re2.append(reVal);

    a = 0.9985;
    b = 3.412;
    n = 0.5;
    value = a - b / math.sqrt(Re2[i]);  # ISO 9300-n  JJG6202008 临界流文丘里喷嘴
    Cd4.append(value);

Re3 = [];
start3 = 1.5*math.pow(10,4);
end3 = 2.0*math.pow(10,6);
count3 = (end3 - start3)/stepLen;  # len = 9900000  count = 9900
print("count3="+str(count3));

for i in range(int(count3)):
    reVal = start3 + i * stepLen;

    Re3.append(reVal);

    value = 1.0118 - 0.5476* math.pow(reVal,-0.2) + 5.5616 * math.pow(reVal,-0.4) - 25.795 * math.pow(reVal,-0.6);
    Cd5.append(value);

for MODEL in range(1,5):
    print(MODEL)
    Re = [];
    reVal = 0;
    for i in range(int(count)):
        reVal = start + i * stepLen;
        Re.append(reVal);

        if MODEL == 1:
            a = 0.9959;
            b = -2.7200;
            value = a + b / math.sqrt(Re[i]);  #ISO 9300-n
            Cd1.append(value);
            # yp11  = a + b / math.sqrt(p1Re);  #ISO 9300-n

            x_10664_nmi = 6.7 * math.pow(10, 5);
            y_10664_nmi9300 = a + b / math.sqrt(x_10664_nmi);  # ISO 9300-n
            x_10664_cq = 2.09 * math.pow(10, 6);
            y_10664_cq9300 = a + b / math.sqrt(x_10664_cq);  # ISO 9300-n
        elif MODEL == 2:
            a = 0.99845;
            b = -3.412;
            c = -0.00255;
            d = 0.692;
            e = 19.3;
            f = 70000;
            partA = a + b / math.sqrt(Re[i]);
            partB = (c+d/math.sqrt(Re[i]))/(1+math.exp(e - Re[i]/f));
            value = partA+partB;  #NIMJ-2013
            Cd2.append(value);

            partA2 = a + b / math.sqrt(p1Re);
            partB2 = (c + d / math.sqrt(p1Re)) / (1 + math.exp(e - p1Re / f));
            yp12 = partA2 + partB2;

            partA3 = a + b / math.sqrt(p2Re);
            partB3 = (c + d / math.sqrt(p2Re)) / (1 + math.exp(e - p2Re / f));
            yp13 = partA3 + partB3;

            x_10664_cq = 2.09*math.pow(10,6);
            partA4 = a + b / math.sqrt(x_10664_cq);
            partB4 = (c + d / math.sqrt(x_10664_cq)) / (1 + math.exp(e - x_10664_cq / f));
            y_10664_cq_nimj = partA4 + partB4;

            x_10664_nmi = 6.7*math.pow(10,5);
            partA5 = a + b / math.sqrt(x_10664_nmi);
            partB5 = (c + d / math.sqrt(x_10664_nmi)) / (1 + math.exp(e - x_10664_nmi / f));
            y_10664_nmi_nimj = partA5 + partB5;
        elif MODEL == 3:
            a = 0.99982;
            b = -4.45681;
            c = -0.0041;
            d = 1.08767;
            e = 7.34612;
            f = 120000;
            partA = a + b / math.sqrt(Re[i]);
            partB = (c + d / math.sqrt(Re[i])) / (1 + math.exp(e - Re[i] / f));
            value = partA + partB;  #NIM-2016
            Cd3.append(value);


            partA2 = a + b / math.sqrt(p1Re);
            partB2 = (c + d / math.sqrt(p1Re)) / (1 + math.exp(e - p1Re / f));
            yp14 = partA2 + partB2;

            partA3 = a + b / math.sqrt(p2Re);
            partB3 = (c + d / math.sqrt(p2Re)) / (1 + math.exp(e - p2Re / f));
            yp15 = partA3 + partB3;

            x_10664_cq = 2.09*math.pow(10,6);
            partA4 = a + b / math.sqrt(x_10664_cq);
            partB4 = (c + d / math.sqrt(x_10664_cq)) / (1 + math.exp(e - x_10664_cq / f));
            y_10664_cq_nim = partA4 + partB4;

            x_10664_nmi = 6.7 * math.pow(10, 5);
            partA5 = a + b / math.sqrt(x_10664_nmi);
            partB5 = (c + d / math.sqrt(x_10664_nmi)) / (1 + math.exp(e - x_10664_nmi / f));
            y_10664_nmi_nim = partA5 + partB5;
        # print(Re)
print("5.55"+str(yp12));
print("5.55"+str(yp13));
plt.plot(Re,Cd1,color="green",label = "curve 1");
plt.plot(Re,Cd2,color="purple",label = "curve 2");
plt.plot(Re,Cd3,color="orange",label = "curve 3");
plt.plot(Re2,Cd4,color="black",label = "curve 4");
plt.plot(Re3,Cd5,color="red",label = "curve 5");
x_10664_nmi = 6.7*math.pow(10,5);
y_10664_nmi = 0.9955;
plt.plot(x_10664_nmi,y_10664_nmi,'o');

x_10664_cq = 2.09*math.pow(10,6);
y_10664_cq = 0.9869;
plt.plot(x_10664_cq,y_10664_cq,'s');

plt.plot(x_10664_cq,y_10664_cq_nimj,'s',color="green");

plt.plot(x_10664_cq,y_10664_cq_nim,'s',color="green");

plt.plot(x_10664_cq,y_10664_cq9300,'s',color="gold");

plt.plot(x_10664_nmi,y_10664_nmi_nimj,'o',color="red");

plt.plot(x_10664_nmi,y_10664_nmi_nim,'o',color="red");

plt.plot(x_10664_nmi,y_10664_nmi9300,'o',color="red");

plt.plot(p1Re,yp12,'p',color="green");
plt.plot(p2Re,yp13,'D',color="green");

plt.plot(p1Re,yp14,'p',color="purple");
plt.plot(p2Re,yp15,'D',color="purple");

plt.legend(["ISO 9300-n","NIMJ-2013","NIM-2016","ISO 9300 GM","Ishibashi-t"])

plt.show();