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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Studies of the Combustion Process with Simultaneous Formaldehyde and OH PLIF in a Direct-Injected HCCI Engine
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Studies of the Combustion Process with Simultaneous Formaldehyde and OH PLIF in a Direct-Injected HCCI Engine

机译：直接喷射HCCI发动机中同时甲醛和OH PLIF燃烧过程的研究

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This paper presents simultaneous laser based measurements of formaldehyde and OH-radical distributions in a 0.5 liter optical HCCI engine with direct injection. Formaldehyde is formed as an intermediate species when combusting hydrocarbons. The formation occurs through low temperature reactions in an early phase of the combustion process. Later in the process formaldehyde is being consumed. Formaldehyde is, therefore, used as indicator of the first stage of combustion and a marker of zones with low-temperature reactions. The OH radical is formed as an intermediate during the high temperature reactions, and is used as a marker of zones where the combustion is ongoing. The purpose of the investigation was to study how the combustion process is affected by the change in homogeneity that arises from early and late injection, respectively. The measurement technique used was planar laser-induced fluorescence where formaldehyde was excited at 355 nm and OH at 283 nm.
机译：本文介绍了在直接喷射的0.5升光学HCCI发动机中基于激光的同时测量甲醛和OH自由基分布的方法。燃烧碳氢化合物时，甲醛是作为中间物质形成的。形成是通过在燃烧过程的早期阶段发生的低温反应而发生的。在此过程的后期，甲醛被消耗掉。因此，甲醛被用作燃烧第一阶段的指示剂和低温反应区域的标志。 OH自由基在高温反应过程中作为中间体形成，并用作正在进行燃烧的区域的标记。研究的目的是研究分别由早期和晚期喷射引起的均匀性变化如何影响燃烧过程。使用的测量技术是平面激光诱导的荧光，其中在355 nm处激发甲醛，在283 nm处激发OH。

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