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Mathematical and Computational Applications is published by MDPI from Volume 21 Issue 1 (2016). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on as a courtesy and upon agreement with the previous journal publisher.
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Math. Comput. Appl. 2007, 12(3), 161-171;

Mathematical Modeling of a SI Engine Cycle with Actual Air-Fuel Cycle Analyses

Department of Mechanical Education, Technical Education Faculty, Karabuk University, Karabuk, Turkey
Department of Automotive, Vocational College, Karabuk University, Karabuk, Turkey
Author to whom correspondence should be addressed.
Published: 1 December 2007
PDF [244 KB, uploaded 30 March 2016]


The performance of an engine whose basic design parameters are known can be predicted with the assistance of simulation programs into the less time, cost and near value of actual. However, inadequate areas of the current model can guide future research because the effects of design variables on engine performance can be determined before. In this study, thermodynamic cycle and performance analyses were simulated for various engine speeds (1800, 2400 ve 3600 1/min) and various excess air coefficients (EAC) (0.95-1.05) to crank shaft angle (CA) with 1 degree increment at full load and 8:1 constant compression ratio (CR) of a SI engine with four stroke, single cylinder and natural aspirated. Brake mean effective pressure, power, thermal efficiency, specific fuel consumption (sfc), etc engine performance parameters were calculated; the values of peak cylinder pressures and temperatures and positions of them were determined by the present program. Variations of these parameters with crank angle, engine speed and excess air coefficient were presented graphically. The calculated results show good agreement with literature. Simulation program is usable to set for varies load, compression ratios, and engine sizes.
Keywords: Spark Ignition (SI) engine; Air-fuel cycle; Excess Air Coefficient (EAC) Spark Ignition (SI) engine; Air-fuel cycle; Excess Air Coefficient (EAC)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sekmen, P.; Sekmen, Y. Mathematical Modeling of a SI Engine Cycle with Actual Air-Fuel Cycle Analyses. Math. Comput. Appl. 2007, 12, 161-171.

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