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Experimental investigation for optimum compression ratio of single cylinder spark ignition engine

机译：单缸火花点火发动机最佳压缩比的实验研究

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The present experimental investigation is intended to find the optimum compression ratio (CR) of single cylinder-spark ignition engine (SIE). In order to improve the performance characteristics of SIE includes improving brake thermal efficiency (BTE) and reducing brake specific fuel consumption (BSFC) which represents the main targets of this study. The volume of combustion chamber was altered by changing the thickness of cylinder head gasket, and keeping other components, that form the geometry shape of combustion chamber, constant to obtain various clearance volume and consequently variable compression ratios (VCRS). This altering permitted to have different values of CRS of 7, 7.5, 8, 8.5, and 8.7 at engine speeds of 2600 and 2800 rpm at different loads. The results showed that BTE was increased by an average of 13 % with increase of CR from 8.5 to 8.7 and it was decreased by an average of 7.5 % with decrease of CR from 8.5 to 7 at an average speed. Also, it was found that BSFC was decreased with an average of 11 % as CR was increased from 8.5 to 8.7, whereas BSFC was increased with an average of 4.5 % as CR was decreased from 8.5 to 7 at an average speed. Based on these results, it is clearly obvious that the optimum CR is 8.7.
机译：本实验研究旨在找到单缸火花点火发动机（SIE）的最佳压缩比（CR）。为了提高筛子的性能特征，包括提高制动热效率（BTE）并减少制动特定的燃料消耗（BSFC），其代表该研究的主要目标。通过改变气缸盖垫圈的厚度，保持其他部件，形成燃烧室的几何形状，恒定以获得各种间隙，并且因此通过改变其他部件来改变燃烧室的体积，以获得各种间隙体积并因此可变压缩比（VCR）。这种改变允许在不同载荷的发动机速度下具有7,7,5,8,8.5和8.7的CRS的不同值。结果表明，随着8.5至8.7的增加，BTE平均增加了13％，平均降低了7.5％，但平均速度降低了8.5至7。此外，发现BSFC平均下降11％，因为Cr从8.5增加到8.7，而BSFC平均增加4.5％，因为Cr以平均速度从8.5降至7.5％。根据这些结果，显然是最佳CR为8.7。

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