Comparison between Air standard cycles and actual cycles.
|Air Standard Cycle
|Pure air is used.
|Working fluid is a combination of air fuel
and residual gas in the cylinder.
|Composition of working fluid remains
|Composition of working fluid changes
at every instant of time.
|Specific heat of working fluid is
considered as constant.
|Specific heat of working fluid changes
at every instant during combustion
|Constant $C_p$ and $C_v$.
|$C_p$ and $C_v $ changes.
|It consists of reversible processes.
|It consists of irreversible processes.
|Ideal gas equation ie, PV=mRT is valid
in each point.
|Not valid in actual cycles.
|No loss of work.
|Loss of work due to friction and leakage.
|Losses are not considered.
|Time loss factor,heat loss factor,exhaust
blow down,piping loss all are considered.