Knoch-Suppression Effect and Performance in Biogas and Gasoline Fuelled Spark Ignition Engine

概要

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The experimental study was made to investigate the knock-suppression effect and the performance in biogas and gasoline fuelled spark ignition engine. Using a CFR engine, this investigation was carried out to obtain the optimum engine performance operated under given biogas/gasoline ratios. The effects of various operating parameters related to compression ratio, spark timing and equivalence ratio on the engine performance data such as power output, fuel consumption and tendency to knock, were determined. The main results of this work may be summarized as folloes;(1) In the case where the calorific ratio of biogas in a biogas-gasoline is about 30%, the antiknock effectiveness of the fuel is increased remarkably and knock-free operation is possible even with a compression ratio of 16:1.(2) For biogas calorific ratio of 30%, and equivalence ratio of 1.05, both maximum power output and minimum fuel consumption are obtained at the compression ratio of 11-12, and the spark timing of 15° BTDC.(3) Under engine operating conditions described above, the maximum power output decreases about 5%, however, the minimum fuel consumption is improved about 10%, than those for same engine using gasoline.
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