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+clc;funcprot(0);//EXAMPLE 12.7

+// Initialisation of Variables

+n=6;...............//No of cylinders

+afr=20;...........//Air fuel ratio

+d = 0.1;...............//cylinder bore in mm

+l=0.14;..............//Cylinder length in mm

+etav=0.8;............//Volumetric Efficiency

+pa=1;.................//Pressure at the beginning of the compression in bar

+ta = 300;.............//Temperature at the beginning of the compression in Kelvin

+theta = 20;...............//Crank travel in degree for injection

+N = 1500;...................//engine rpm

+rhof=960;.................//Fuel density in kg/m^3

+cf=0.67;................//Co efficient of discharge for injector

+pi=150;....................//injection pressure in bar

+pc=40;....................//combustion pressure in bar

+R=287;........................//gas constant for air in kJ/kg.K

+//calculations

+V=(%pi/4)*d^2*l*etav;......................//Volume of air supplied per cylinder per cycle in m^3

+ma=(pa*10^5*V)/(R*ta);.....................//Mass of this air at suction conditions in kg/cycle

+mf=ma/afr;............................//Mass of fuel in kg/cycle

+fipc = (theta*60)/(360*N);...........//Time taken for fuel injection per cycle in seconds

+MF = mf/fipc;........................//Mass of fuel injected into each cylinder per second

+disp(MF,"The mass of fuel injected into each cylinder per second in kg/s :")

+vf=cf*sqrt((2*(pi-pc)*10^5)/rhof);.............//fuel velocity injection in m/s

+d0=sqrt((MF*4)/(%pi*vf*rhof));..................//diameter of fuel orifice in m

+disp(d0*1000,"Diameter of the fuel orifice in mm :")