Second-Law Analysis of Diesel Engine Combustion

[+] Author and Article Information
J. H. Van Gerpen, H. N. Shapiro

Department of Mechanical Engineering, Iowa State University, Ames, IA 50011

J. Eng. Gas Turbines Power 112(1), 129-137 (Jan 01, 1990) (9 pages) doi:10.1115/1.2906467 History: Received July 22, 1988; Online April 24, 2008


A second-law analysis of the combustion process in a diesel engine is presented for a single-zone model. Expressions for availability and the availability balance are developed in detail from the energy and entropy balances and applied in a manner that allows the irreversibility due to combustion to be separated from that associated with heat transfer to the walls. Availability is divided into two components: thermomechanical and chemical availability. For the first time, chemical availability of the cylinder contents is dealt with rigorously, which allows for a correct determination of combustion irreversibilities. The analysis is applied in a parametric study of the effects of combustion timing, mass burning rate, and heat transfer rate on the irreversibility and system availability.

Copyright © 1990 by The American Society of Mechanical Engineers
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