Diesel engines can be approximated by a dual cycle.

Diesel engines can be approximated by a dual cycle.

Diesel engines can be approximated by a dual cycle. In dual
cycle, a fraction of the fuel is burnt at constant volume and the
remaining fuel is burnt at constant pressure. Use this cycle
approximation to analyze the following problem: Inlet conditions:
Compression ratio: Heat added during combustion: Fuel-­‐to-­‐air
ratio: Υ = Cp/Cv P1 = 1 bar, T1=289K 15:1 43 MJ/kg of fuel 0.045
1.35 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

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