Engine intake and exhaust valves are closed during sequence 1-2-3-4-5, the cylinder can be…

Engine intake and exhaust valves are closed during sequence 1-2-3-4-5, the cylinder can be modelled as a closed system. Compression ratio rc is rc=(Vs+Vc)/Vc,for this engine rc=10:1 and Vs =2*10^-3. Working fluid is air, which can be treated as perfect gas. volume at point 5 is Vc+Vs. Process 1-2 is isentropic compression. Process 2-3 is heat addition at constant volume. Heat transferred to the working fluid is Q2-3=mf*QLHV where QLHV is 44MJ/kg and mf=ma/AFR where AFR=30 and ma= mass of trapped air at point 1. Process 3-4 is isentropic expansion. Process 4-5 is heat rejection at constant volume. Pressure p5=p6 is always 1 bar during exhaust stroke 5-6. P7=p1 varies, Temperature at 1 , T1 is always 300K. Find mass of trapped air at point 1, m1 and pressures and temperatures at points 2,3,4,5.

 

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