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Diffstat (limited to '3751/CH11/EX11.6/Ex11_6.sce')
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diff --git a/3751/CH11/EX11.6/Ex11_6.sce b/3751/CH11/EX11.6/Ex11_6.sce new file mode 100644 index 000000000..7c8c9871e --- /dev/null +++ b/3751/CH11/EX11.6/Ex11_6.sce @@ -0,0 +1,59 @@ +//Fluid Systems - By - Shiv Kumar +//Chapter 11- Centrifugal Pumps +//Example 11.6 +//To Calculate the Blade angle at Outlet, Power Required and Overall Efficiency of Pump. + + clc + clear + +//Given Data:- + Do=80; //Outer Diameter of the Impeller, cm + Q=1; //Discharge, m^3/s + H=80; //Head, m + N=1000; //Speed, rpm + bo=8; //Width at Outlet, cm + Delta_Q_per=3; //Percentage of Leakage Loss(of the Discharge) + Delta_P=10; //Mechanical Loss, kW + eta_H=80/100; //Hydraulic Efficiency + + +//Data Used:- + rho=1000; //Density of water, kg/m^3 + g=9.81; //Acceleration due to gravity, m/s^2 + +//Computations:- + Do=Do/100; //m + bo=bo/100; //m + + uo=%pi*Do*N/60; //m/s + Vfo=Q/(%pi*Do*bo); //m/s + Vwo=g*H/(uo*eta_H); //m/s + Vrwo=uo-Vwo; //m/s + + //(a) + beta_o=atand(Vfo/Vrwo); //Blade Angle at Outlet, degrees + + //Result1 + printf(" Blade Angle at Outlet, beta_o=%.2f Degrees \n",beta_o) //The answer vary due to round off error + + //(b)Power Required + Pi=rho*(1+Delta_Q_per/100)*Q*Vwo*uo; //Power delivered by the Impeller, W + P=Pi/1000+Delta_P; //Power required, kW + + //Result2 + printf(" Power Required, P =%.3f kW \n",P) //The answer vary due to round off error + + //(c)Overall Efficiency, eta_o + eta_V=1/(1+Delta_Q_per/100); //Volumetric Efficiency + eta_m=(P-Delta_P)/P; //Mechanical Efficiency + eta_o=eta_H*eta_V*eta_m*100; //In Percentage + + //Result3 + printf(" Overall Efficiency, eta_o =%.2f Percent \n",eta_o) //The answer vary due to round off error + + //Also, Overall Efficiency + eta_o=rho*Q*g*H/(P*1000)*100; //In Percentage + + printf("Also, Overall Efficiency, eta_o=%.2f Percent\n",eta_o) + + |