Comparison between Air standard cycles and actual cycles.
|Air Standard Cycle||Actual 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.