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clc
D=0.25; //m
r=9;
L=0.3; //m
cv=0.71; //kJ/kg K
cp=1; //kJ/kg K
p1=1; //bar
T1=303; //K
p3=60; //bar
p4=p3;
n=3; //number of working cycles/ sec
y=1.4;
R=287;
disp("(i) Air standard efficiency")
Vs=%pi/4*D^2*L;
Vc=Vs/(r-1);
V1=Vs+Vc;
p2=p1*(r)^y;
T2=T1*r^(y-1);
T3=T2*p3/p2;
rho=4/100*(r-1)+1;
T4=T3*rho;
T5=T4*(rho/r)^(y-1);
p5=p4*(r/rho)^(y);
Qs=cv*(T3-T2)+cp*(T4-T3)
Qr=cv*(T5-T1);
n_airstandard=(Qs-Qr)/Qs;
disp("efficiency =")
disp(n_airstandard)
disp("(ii) Power developed by the engine")
m=p1*10^5*V1/R/T1;
W=m*(Qs-Qr);
P=W*n;
disp("P=")
disp(P)
disp("kW")
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