Title: First and second law analysis of a gasoline engine for various compression ratios

Authors: Adnan Parlak, Yavuz Erbas, Halit Yasar, Hakan Soyhan, Cengiz Deniz

Addresses: Technical Education Faculty, Sakarya University, Esentepe 54187, Sakarya, Turkey. ' Technical Education Faculty, Sakarya University, Esentepe 54187, Sakarya, Turkey. ' Department of Mechanical Engineering, Sakarya University, Esentepe 54187, Sakarya, Turkey. ' Department of Mechanical Engineering, Sakarya University, Esentepe 54187, Sakarya, Turkey. ' Maritime Faculty, Marine Engineering, Istanbul Technical University, Tuzla, Turkey

Abstract: This article presents a comparative energy and exergy analyses of a single cylinder, four-stroke spark-ignition engine for three compression ratios. A Petter engine with variable compression ratio and ignition timing was used to obtain the experimental data at full load conditions for six engine speeds between 1,300 and 2,800 rpm. It was found that the first and the second law efficiencies increased with increasing compression ratio. The maximum extractable power was obtained at the compression ratio 6.2 and observed inversely proportional to the compression ratio.

Keywords: compression ratio; energy analysis; exergy analysis; gasoline engines; spark ignition engines; thermodynamics.

DOI: 10.1504/IJVD.2009.024243

International Journal of Vehicle Design, 2009 Vol.49 No.1/2/3, pp.111 - 124

Available online: 30 Mar 2009 *

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