Title: Effects of varying air-fuel ratio on the performance of a theoretical Diesel cycle

Authors: Osman Azmi Ozsoysal

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

Abstract: This paper analyses the effects of varying air-fuel ratio on the performance of a theoretical Diesel cycle under a temperature restriction as maximum. Amount of heat addition at constant pressure is defined as a function of fuel|s energy with utilising the combustion efficiency. The amount of released energy into the cylinder restricts the compression ratio. Relations between the combustion efficiency and compression ratio and also their limitations are explained. Variation of the compression ratio and combustion efficiency making the work output to maximise are presented. Utilising the combustion efficiency is found to be more useful to realise the cycle feasibility.

Keywords: excess air; cycle feasibility; exergy; combustion efficiency; fuel conversion efficiency; optimised work; air-fuel ratio; diesel cycle; compression ratio.

DOI: 10.1504/IJEX.2010.035513

International Journal of Exergy, 2010 Vol.7 No.6, pp.654 - 666

Received: 05 Jan 2010
Accepted: 05 Jan 2010
Published online: 30 Sep 2010 *

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