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The Effect of Piston Motion on Time Loss in a Spark Ignition Engine
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English
Abstract
Combustion of a spark ignition engine is often idealized by a constant volume process. However, due to piston motion, constant volume combustion can not be realized in an actual engine cycle, and this leads to a loss in thermal efficiency when compared to an ideal Otto cycle. In this paper, such a loss associated with piston motion, termed as time loss, is rigorously studied for spark ignition engines of different piston motion mechanisms. It is found that the time loss of a conventional slider crank engine amounts to maximum 9 % of the total loss depending upon operating conditions. Especially, in the limit of long crankshaft, where piston motion follows a perfect sinusoid, it is shown that the time loss decreases by 2 - 5 %. To determine the dominant factors affecting the time loss, also investigated are the effects of major performance parameters such as compression ratio, combustion start and duration.
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Authors
Citation
Oh, H. and Lee, K., "The Effect of Piston Motion on Time Loss in a Spark Ignition Engine," SAE Technical Paper 891675, 1989, https://doi.org/10.4271/891675.Also In
References
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