Compression ratio and mean effective pressure, Mechanical Engineering

Compression Ratio:

It is calculated as shown below

2309_Compression Ratio and Mean Effective Pressure.png

Mean Effective Pressure (P_m or P_mef):

Mean effective pressure is the hypothetical constant pressure that is assumed to be acting on the piston during its expansion stroke producing the same work output as from the actual cycle.

We can say that

2092_Compression Ratio and Mean Effective Pressure1.png

The constant depends on mechanism used to get the indicator diagram and has units bar/m.

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