alexa Irreversible Performance Characteristics of Air Standard Otto Cycles with Polytropic Processes
ISSN: 2168-9873

Journal of Applied Mechanical Engineering
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Review Article

Irreversible Performance Characteristics of Air Standard Otto Cycles with Polytropic Processes

Mahmoud Huleihil1,2* and Gedalya Mazor2
1Academic Institute for Training Arab Teachers (AITAT), Beit Berl College, Doar Beit Berl, 44905, Israel
2Department of Mechanical Engineering, The Sami Shamoon College of Engineering, 84 Jabotinsky St. Ashdod 77245, Israel
Corresponding Author : Mahmoud Huleihil
Academic Institute for Training Arab Teachers (AITAT)
Beit Berl College, Doar Beit Berl, 44905, Israel
Tel: 09-7476333
Fax: 09-7454104
E-mail: [email protected]
Received June 27, 2012; Accepted August 30, 2012; Published September 03, 2012
Citation: Huleihil M, Mazor G (2012) Irreversible Performance Characteristics of Air Standard Otto Cycles with Polytropic Processes. J Appl Mech Eng 1:111. doi:10.4172/2168-9873.1000111
Copyright: © 2012 Huleihil M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

In this study, the standard Otto cycle is reconsidered, leading to the replacement of its reversible adiabatic processes by polytropic processes. Two models were proposed, the sub-k polytropic model and the super-k polytropic model, in order to account for the losses encountered in the real Otto engine. The performance characteristics of the Otto engine were presented via plots of power vs. efficiency curves. The results, based on the two models, predict a slightly higher than 30% reduction in the net power output. The results also show that the efficiency of the real Otto engine lies at approximately 70% of the efficiency obtained from the standard Otto cycle. The current study’s value is generally educational, and may also serve as guidance for engineers performing detailed simulations or conducting expensive experiments in the field.

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