Many diesel engines can be approximated by a dual (limited-pressure) cycle. In a

Question

Many diesel engines can be approximated by a dual (limited-pressure) cycle. In a limited pressure cycle, a fraction of the fuel is burnt at constant volume and the remaining fuel is burnt at constant pressure. Use this cycle approximation with Gamma = Cp/Cv = 1.35 to analyse the following problem: Inlet conditions: P_1, = 1.0 bar, T_1 = 289K Compression ratio: 15:1 Heat added during combustion: 43,000 kJ/kg of fuel Overall air/fuel ratio: 20 kg air/kg fuel Half of the fuel is burnt at constant volume, then half at constant pressure. Draw a p-V diagram and compute the thermal efficiency of the cycle. Compare the efficiency and peak pressure of the cycle with the efficiency and peak pressure that would be attained if all the fuel were burnt at constant volume.

Explanation / Answer

Since, data relating to pressure ratio, expansion ratio, Qin)V , Qin)P , Qout are missing. Hence problem can't be solved.

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