16 April 2017

Comparison of air standard and actual cycles

The actual cycles for internal combustion engines differ from air-standard cycles in many respects. 

The differences are following below :

  • The change in the chemical composition of the working substance.
  • The variation of specific heat with temperature.
  • The change in composition, temperature and the actual amount of fresh charge is because of the residual gases.
  • The working substance is a mixture of air and fuel vapor or finely atomized liquid fuel in the air combined with the products of combustion left from the previous cycle.
  • Progressive combustion rather than instantaneous combustion.
  • The heat transfer to and from the working medium.
  • Gas leakage, fluid friction etc.
  • The substantial exhaust blows down loss.
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