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+// scilab Code Exa 12.2 Calculation on a centrifugal air compressor 

+T01=288;  // in Kelvin

+p01=1.02; //  Initial Pressure in bar

+dh=0.10; // hub diameter in m

+dt=0.25; // tip diameter in m

+m=5; //  in kg/s

+gamma=1.4;

+n=(gamma-1)/gamma;

+N=7.2e3; // rotor Speed in RPM

+d2=0.45; // Impeller diameter in m

+cp=1005; // Specific Heat at Constant Pressure in J/(kgK)

+u2=%pi*d2*N/60;

+pr0=((1+(u2^2/(cp*T01)))^(1/n));

+disp(pr0,"pressure ratio developed pr0=")

+w=u2^2;

+disp("kW/(kg/s)",w*1e-3,"Power required to drive the compressor P=")