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+//Calculations on 2 stroke IC engine

+clc,clear

+//Given:

+n=2 //Number of cylinders

+N=4000 //Angular speed of engine in rpm

+eta_v=0.77 //Volumetric efficiency

+eta_m=0.75 //Mechanical efficiency

+V_f=10 //Fuel consumption in l/hr

+s=0.73 //Specific gravity

+h=10500 //Enthalpy of fuel in kcal/kg

+A_F=18 //Air-fuel ratio

+v_p=600 //Speed of piston in m/min

+imep=5 //Indicated mean effective pressure in atm 

+T=298,P=1.013 //Standard temperature and pressure in K and bar

+//Solution:

+R=0.287 //Specific gas constant in kJ/kgK

+m_f=V_f*s //Fuel consumption in kg/hr

+m_a=A_F*m_f //Air consumption in kg/hr

+m_c=m_f+m_a //Mass of total charge in kg/hr

+m=round(m_c/eta_v) //Mass of charge corresponding to the swept volume in kg/hr

+V=(m/2)*R*T/(P*100) //Volume of charge consumed in m^3/hr

+V_s=V*10^6/(60*N) //Swept volume by piston per stroke in cc

+L=v_p*100/(2*N) //Stroke length of cylinder in cm

+d=sqrt(4*V_s/(%pi*L)) //Bore of cylinder in cm

+IHP=round(imep*V_s*N*n/450000) //Indicated horse power in metric HP

+BHP=IHP*eta_m //Brake horse power in metric HP

+eta_t=BHP*736*3600/(V_f*s*h*4187) //Thermal efficiency

+//Results:

+printf("\n The engine dimensions\n\t Stroke length, L = %.1f cm\n\t Bore, d = %.1f cm",L,d)

+printf("\n The brake power output, BHP = %.1f metric HP",BHP)

+printf("\n The thermal efficiency, eta_t = %.1f percent\n\n",eta_t*100)