Title: Effects of combustion efficiency on an Otto cycle

Authors: Osman Azmi Ozsoysal

Addresses: Naval Architecture and Marine Engineering Department, Istanbul Technical University, Ayazaga Campus, TR-34469, Istanbul, Turkey

Abstract: This paper explains how the combustion efficiency influence the performance of an irreversible Otto cycle under conditions of varying fuel-air ratio. The irreversibility of Otto cycle comes exclusively from the expansion and compression processes. It is assumed that some fraction of the fuel|s chemical energy cannot be fully released inside the engine because of incomplete combustion. Amount of the released energy from fuel into the cylinder restricts the compression ratio. Thermal efficiency-work curves cannot have a closed loop shape because of the relationships between the fuel energy, air-fuel mass ratio, combustion efficiency, maximum temperature and heat losses.

Keywords: irreversible Otto cycle; air-fuel mass ratio; waste energy; combustion efficiency; fuel conversion efficiency.

DOI: 10.1504/IJEX.2010.031242

International Journal of Exergy, 2010 Vol.7 No.2, pp.232 - 242

Available online: 26 Jan 2010 *

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