Thermal Science 2010 Volume 14, Issue 4, Pages: 887-896
https://doi.org/10.2298/TSCI090128034G
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Finite time thermodynamic modeling and analysis for an irreversible Atkinson cycle
Ge Yanlin
Chen Lingen
Sun Fengrui
Performance of an air-standard Atkinson cycle is analyzed by using
finite-time thermodynamics. The irreversible cycle model which is more close
to practice is founded. In this model, the nonlinear relation between the
specific heats of working fluid and its temperature, the friction loss
computed according to the mean velocity of the piston, the internal
irreversibility described by using the compression and expansion
efficiencies, and heat transfer loss are considered. The relations between
the power output and the compression ratio, between the thermal efficiency
and the compression ratio, as well as the optimal relation between power
output and the efficiency of the cycle are derived by detailed numerical
examples. Moreover, the effects of internal irreversibility, heat transfer
loss and friction loss on the cycle performance are analyzed. The results
obtained in this paper may provide guidelines for the design of practical
internal combustion engines.
Keywords: finite-time thermodynamics, Atkinson cycles, heat resistance, friction, internal irreversibility, performance optimization