20506 ノッキング時における低温酸化反応の分光学的解析(エネルギー・環境問題に対応するエンジン・燃料技術(1),OS.11 エネルギー・環境問題に対応するエンジン・燃料技術)

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An increase of the compression ratio is enumerated as one of the methods of improving thermal efficiency in the internal combustion engine. However, when the compression ratio is only increased, the knocking is generated. With the aim of understanding a knocking better, we paid attention to preflame reactions before the autoignition. And we tested it with spectroscopic measurement. We measured a wavelength of the light emission of 306.4nm (characteristic spectrum of OH) and 395.2nm (HCHO). And we measured a wavelength of the light absorption of 293.1 nm (HCHO). The results revealed that the dependence of the time of autoignition on the fuel octane number varies depending on differences in the state of flame progression under a cool flame condition.
2009-03-05