Plotting graphs with changing values for variables

Question

Marie Cor Cruz 2022-3-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1660720-plotting-graphs-with-changing-values-for-variables

回答： Pavan Sahith 2023-10-16

So I'm trying to plot 4 different graphs. Each graph will have 2 plots. However, is there a way for me to change the value of the variable down the line? For example, for #4 graph, I only want to change Ma to linspace and not use the original Ma=0.92 value that was inputted in the very beginning of my code. I've attached my code below. Not sure what I'm doing wrong but I'm sure I may be missing some commands. Thank you for the help.

%% Problem 2.10
alt=0;
Ma=0.92;
deltaH=18100;
Pa=14.69;
mdot=100;
T_t4=2450;
T_a=518.7;
gamma=1.4;
g=gamma-1;
R=53.35;
Cp=0.2399565;
rho_8=1.308126E-03;
pi_c=2.223813 
%Diffuser
aa=sqrt(gamma*R*32.17*T_a);
ua=Ma*aa;
T_ta=(1+0.5*(gamma-1)*Ma^2)*T_a;
P_ta=Pa*(T_ta./T_a).^(gamma/g);
T_t2=T_ta;
P_t2=P_ta;
pi_c=linspace(5,20);
%Compressor
P_t3=pi_c.*P_t2;
tau_c=pi_c.^((gamma-1)./gamma);
T_t3=tau_c.*T_t2;
%Primary Combustor
P_t4=P_t3;
m_dotf=(mdot.*Cp.*(T_t4-T_t3))./deltaH;
%Turbine
T_t5=([(m_dotf.*Cp.*(T_t3-T_t2))./(mdot.*Cp)]-T_t4).*-1;
tau_t=T_t5./T_t4;
tau_t=T_t5./T_t4;
pi_t=0.2827511;
P_t5=pi_t.*P_t4;
%Primary Nozzle
T_t6=T_t5;
P_t6=P_t5;
P_8= 14.69; %exit pressure matches ambient pressure
T_8=T_t6.*((P_8./P_t6).^((gamma-1)/gamma));
u_8=[2*Cp.*(T_t6-T_8)*32.17*778.16].^0.5;
a_8=(gamma*R*T_8.*32.17).^0.5;
M_8=u_8./a_8;
A_8=m_dotf.*144./(rho_8.*u_8*32.17);
%Total Thrust and TSFC
F=mdot.*u_8-mdot.*ua;
nDF=(F.*32.17)./(mdot.*aa);
TSFC=mdot.*3600./F; 
TSFCaa=TSFC.*aa;
%%% Graphs
%% 1. 
pi_c=linspace(5,20)
f1=figure(1);clf;
plot (pi_c,TSFCaa,'k')
title('Figure 1. TSFC_a vs. \pi_c');
xlabel('\pi_c')
ylabel('TSFC_a_a')
f2=figure(2);clf;
plot(pi_c,nDF,'k')
title ('Figure 2. nDF_a vs. \pi_c');
xlabel('\pi_c')
ylabel('F/m_a_a')
%% 2.
T_a=linspace(0.5,1.2);
f3=figure(3);clf;
plot(T_a,TSFCaa,'k')
title ('Figure 3. TSFC_a_a vs. T_a/T_s_t_p');
xlabel('T_a/T_s_t_p')
ylabel('TSFC_a')
f4=figure(4);clf;
plot(Ta_Tstp,nDF,'k')
title ('Figure 4. nDF_a vs. T_a/T_s_t_p');
xlabel('T_a/T_s_t_p')
ylabel('F/m_a_a')
%% 3.
T_t4=linspace(4,8);
f5=figure(5);clf;
plot(T_t4,TSFCaa,'k')
title('Figure 5. TSFC_a_a vs (T_t_4/T_a)')
xlabel('T_t_4/T_a')
ylabel('TSFC_a_a')
f6=figure(6);clf;
plot(T_t4,nDF,'k')
title('Figure 5. nDF vs (T_t_4/T_a)')
xlabel('T_t_4/T_a')
ylabel('F/m_a_a')
%% 4 
Ma=linspace(0,5);
f7=figure(7);clf;
plot(Ma, TSFCaa,'k')
title('Figure 6. TSFC_a_a vs Ma')
xlabel('Ma')
ylabel('TSFC_a_a')
f8=figure(8);clf;
plot(Ma,nDF,'k')
title('Figure 6. nDF vs Ma')
xlabel('Ma')
ylabel('F/m_a_a')