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.
International Journal of Exergy, 2010 Vol.7 No.2, pp.232 - 242
Available online: 26 Jan 2010 *Full-text access for editors Access for subscribers Purchase this article Comment on this article