Title: Second law analysis of a spark ignition engine under high values of ignition retard

Authors: Hakan Ozcan; Mustafa Özbey; M. Sait Söylemez; Bahattin Topaloglu

Addresses: Department of Mechanical Engineering, Ondokuz Mayis University, Samsun 55139, Turkey. ' Department of Mechanical Engineering, Ondokuz Mayis University, Samsun 55139, Turkey. ' Department of Mechanical Engineering, University of Gaziantep, 27310, Turkey. ' Department of Mechanical Engineering, Ondokuz Mayis University, Samsun 55139, Turkey

Abstract: The availability analysis of an SI (spark-ignition) engine under HVIR (high values ignition retard) was investigated. LPG (liquefied petroleum gas) was used as fuel. The results obtained in this paper may provide guidance to determine the proper ignition retard timing for cold-start emissions control. Results showed that cylinder pressure, availability transfer by heat and availability transfer by work significantly decreased as the spark timing was changed from normal to most retarded timing. Finally, as the spark timing was changed from normal timing to the most retarded timing, the availability transfer due to net exhaust flow and availability destruction due to combustion were significantly increased.

Keywords: exergy anaysis; availability; LPG; liquefied petroleum gas; SI engine; ignition retard; cold start combustion; second law; thermodynamics; spark ignition engines; cylinder pressure; heat transfer; spark timing.

DOI: 10.1504/IJVD.2012.045924

International Journal of Vehicle Design, 2012 Vol.58 No.1, pp.79 - 92

Received: 24 May 2010
Accepted: 21 Jan 2011
Published online: 23 Apr 2013 *

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