Effect of Expansion-Compression Ratio on Performance of the Miller cycle

• Authors: R. Ebrahimi
• Languages of publication: EN

Abstracts

EN

The objective of this study is to analyze the effect of expansion-compression ratio on the performance of dual cycle. Using finite-time thermodynamics, the relations between thermal efficiency, power output and compression ratio for an air standard Miller cycle have been derived. In the model, the nonlinear relation between the specific heats of working fluid and its temperature, the frictional loss computed according to the mean velocity of the piston, and heat transfer loss are considered. The results show that the power output first increases with the increasing expansion-compression ratio and then starts to decrease. Comparisons of the power output of the Miller, Otto, and Atkinson cycles show that if compression ratio is less than certain value, the power output for Otto cycle is higher, while if compression ratio exceeds certain value, the power output for the Miller cycle is higher. With further increase in compression ratio, the power output for Atkinson cycle is higher. In high compression ratio, the power output of the Miller cycle is higher. The results obtained in the present study provide guidance to the performance evaluation and improvement for practical internal combustion engines.

Keywords

EN

05.70.Ln; 82.60.Fa; 88.05.-b; 88.20.td

Discipline

• 82.60.Fa: Heat capacities and heats of phase transitions
• 05.70.Ln: Nonequilibrium and irreversible thermodynamics(see also 82.40.Bj Oscillations, chaos, and bifurcations in physical chemistry and chemical physics)
• 88.20.td: Heat
• 88.05.-b: Energy analysis

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 4
• Pages: 645-649

Dates

published

2012-10

received

2011-06-10

Contributors

author

R. Ebrahimi

• Department of Agriculture Machine Mechanics, Shahrekord University, P.O. Box 115, Shahrekord, Iran

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Identifiers

DOI

10.12693/APhysPolA.122.645