Experimental study on HCCI combustion using composite fuel of n-heptane and alkenes

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  • ノルマルヘプタンとアルケン類の複合燃料を用いたHCCI 燃焼に関する実験的研究

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In this study, in order to determine the effect of double bonds in fuel molecule on ignition and combustion of nheptane, HCCI combustion experiments were performed using n-heptane/air mixture in co-existence with three kind of alkenes with different carbon number of 2 – 4, ethylene, propylene and 1-butene. A single cylinder research engine with compression ratio of 14.7:1 was used for the experiments at a constant speed of 960 rpm. When these alkenes co-exist, the low temperature oxidation was delayed and the low temperature oxidation heat release was almost equally reduced compared with n-heptane alone, regardless of carbon number of alkenes. This is unlike in the case of alkane co-existence, in which the effect of the low temperature oxidation differs widely depending on the carbon number.

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