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diff --git a/3751/CH11/EX11.18/Ex11_18.sce b/3751/CH11/EX11.18/Ex11_18.sce new file mode 100644 index 000000000..f4fdce99e --- /dev/null +++ b/3751/CH11/EX11.18/Ex11_18.sce @@ -0,0 +1,51 @@ +//Fluid Systems - By - Shiv Kumar +//Chapter 11- Centrifugal Pumps +//Example 11.18 +//To Find (a)Manometric Efficiency. (b)Inlet Vane Angles. (c)Loss of Head at Inlet of Impeller + + clc + clear + +//Given Data:- + Q=0.21; //Discharge, m^3/s + Af=0.085; //Cross-sectional Area of Flow, m^2 + Di=300; //Inner Diameter of the Impeller, mm + Do=600; //Outer Diameter of the Impeller, mm + N=600; //Speed, rpm + Hm=19; //Manometric Head, m + beta_o=35; //degrees + Q_per=30; //Percentage by which Discharge is reduced + + +//Data Used: - + g=9.81; //Acceleration due to gravity, m/s^2 + + +//Computations:- + Di=Di/1000; //m + Do=Do/1000; //m + + ui=%pi*Di*N/60; //Tangential Velocity of Impeller at Inlet, m/s + uo=%pi*Do*N/60; //Tangential Velocity of Impeller at Outlet, m/s + Vfo=Q/Af; //Velocity of Flow, m/s + Vfi= Vfo; + Vwo=uo-Vfo/tand(beta_o); //m/s + + //(a)Manometric Efficiency, eta_man + eta_man=g*Hm/(Vwo*uo)*100; //In Percentage + + //(b)Inlet Vane Angle, beta_i + beta_i=atand(Vfi/ui); //degrees + + //(c)Loss of Head at inlet, H_L + Q_dash=Q-Q_per/100*Q; //m^3/s + Vfi_dash=Q_dash/Af; //m/s + H_L=(ui-Vfi_dash*cotd(beta_i) )^2/(2*g); // m of water + +//Results + printf("(a)Manometric Efficiency, eta_man =%.2f Percent \n",eta_man) //The answer vary due to round off error + printf ("(b)Inlet Vane Angle, beta_i =%.2f Degrees \n",beta_i) //The answer vary due to round off error + printf ("(c)Loss of Head at Inlet to the Impeller =%.3f m of water", H_L) //The answer vary due to round off error + + + |