
ECOLOGICAL OPTIMIZATION OF AN IRREVERSIBLE OTTO CYCLE WITH VARIABLE SPECIFIC HEATS OF WORKING FLUID
Yanlin Ge Institute of Thermal Science and Power Engineering, Naval University of Engineering,
Wuhan, 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering,
Wuhan, 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China
Lingen Chen Institute of Thermal Science and Power Engineering, Naval University of Engineering,
Wuhan, 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering,
Wuhan, 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China
Xiaoyong Qin Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033, China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033, China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
Zhihui Xie Institute of Thermal Science and Power Engineering, Naval University of Engineering,
Wuhan, 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering,
Wuhan, 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China
DOI: 10.1615/TFEC2017.fna.018308 pages 16691679
ResumoConsidering internal irreversibility loss (IIL), friction loss (FL) and heat transfer loss (HTL), an irreversible Otto
cycle model is built up by using air standard (AS) assumption. Based on finite time thermodynamics (FTT),
computing entropy generation rate (EGR) by using the irreversible losses in cycle, the ecological function (EF)
performance of cycle is optimized when the specific heat (SH) of the working fluid (WF) varies with
temperature with linear relation. Some important expressions, including efficiency, power output, EGR and EF,
are obtained. Moreover, the effects of variable SH of WF and three losses on cycle performance are investigated.
The research conclusion can provide some guidelines for the actual Otto cycle engine performance optimization.

