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The performance of an air standard Miller cycle is analyzed using nite-time thermodynamics. The relations between the power output and the compression ratio and between the power output and the thermal e ciency are derived by detailed numerical examples. The results show that, throughout the compression ratio range, the power output decreases with increasing residual gases. The results also show that if compression ratio is less than certain value, the power output decreases with increasing equivalence ratio, while if compression ratio exceeds certain value, the power output rst increases and then starts to decrease with increasing equivalence ratio. The conclusions of this investigation are of importance when considering the designs of actual Miller engines.

Power Optimization of a Miller Thermal Cycle with respect to Residual Gases and Equivalence Ratio