I'm plotting the thermal efficiency vs. pressure ratio of an engine based on varying pressure ratio and turbine inlet temperature. I'm coming up with multiple lines of constant temperature on my plot. They're all coming out in blue because of the way I coded it however. If anyone knows how I can change their colors automatically instead of changing my code and going through one by one, that would be awesome.
clear all; close all; clc;%Defining known values
T3=1100;nT=0.89;nC=0.84;T1=290;P1=101.325;k=1.4;% Overall Efficiency: nth=1-(T1/T3)*((rp)^((k-1)/k))
%%Varying Only Pressure Ratio
rp(1)=0;i=1;while rp<=30 nth(i)=1-(T1/T3)*((rp(i)^((k-1)/k))); i=i+1; rp(i)=rp(i-1)+0.1;endnth(i)=1-(T1/T3)*((rp(i)^((k-1)/k)));plot(rp,nth);%%Varying Pressure Ratio and Turbine Inlet Temperature
figure;T3=800;while T3<=1500 rp=0; nth=0; i=1; while rp<=30 nth(i)=1-(T1/T3)*((rp(i)^((k-1)/k))); i=i+1; rp(i)=rp(i-1)+0.1; end nth(i)=1-(T1/T3)*((rp(i)^((k-1)/k))); plot(rp,nth); hold on; T3=T3+100;endgrid on;title('Varying Turbine Inlet Temperature');xlabel('Pressure Ratio, r_p');ylabel('Thermal Efficiency, \eta_t_h');legend('800K','900K','1000K','1100K','1200K','1300K','1400K','1500K');
The "Varying Turbine Inlet Temperature" is the plot I am interested in.
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