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(Cp/Cv)

The cut-off ratio can be expressed in terms of temperature as shown below:
:

:

:

:

can be approximated to the flame temperature of the fuel used. The flame temperature can be approximated to the adiabatic flame temperature of the fuel with corresponding air-to-fuel ratio and compression pressure, . can be approximated to the inlet air temperature.

This formula only gives the ideal thermal efficiency. The

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