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+clc

+clear

+//Input data

+mf=(6/3600);//The mass flow rate of fuel in kg/s

+df=750;//The density of fuel in kg/m^3

+Z=0.003;//The level in the float chamber below the top of the jet in m

+p=1.013;//The ambient pressure in bar

+T=294;//The ambient temperature in K

+dj=0.0012;//The jet diameter in m

+Cdf=0.65;//The discharge coefficient of the jet 

+Cda=0.8;//The discharge coefficient of air 

+A=15.3;//The air fuel ratio 

+pi=3.141;//The mathematical constant of pi

+g=9.81;//The gravitational constant in m/s^2

+R=287;//Real gas constant in J/kgK

+dh=1000;//The density of water in kg/m^2

+

+//Calculations

+da=(p*10^5)/(R*T);//The density of air in kg/m^3

+Ca2=Cda*((2*g*Z*df)/da)^(1/2);//The critical air velocity at the throat

+Aj=(pi/4)*dj^2;//The area of the jet in m^2

+P=[(mf^2/(Cdf^2*Aj^2*2*df))+(g*Z*df)]/10^5;//The dipression at the throat in bar

+h=(P*10^5)/(dh*g);//In meter of water

+h1=(P*10^5)/g;//In mm of water

+ma=mf*A;//The mass flow rate of air in kg/s

+A2=[ma/((Cda*(2*da*(P*10^5))^(1/2)))]*10^4;//The area of the throat in cm^2

+d2=[(A2*4/pi)^(1/2)]*10;//The effective throat diameter in mm

+

+//Output 

+printf('The critical air velocity = %3.3f m/s \n The depression at the throat in mm of H2O = %3.2f mm of H2O \n The effective throat diameter  %3.2f mm ',Ca2,h1,d2)