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首页> 外文期刊>International journal of engine research >Combustion stratification study of partially premixed combustion using Fourier transform analysis of OH* chemiluminescence images
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Combustion stratification study of partially premixed combustion using Fourier transform analysis of OH* chemiluminescence images

机译：使用OH *化学发光图像傅立叶变换分析部分预混燃烧的燃烧分层研究

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摘要

A relatively high level of stratification (qualitatively: lack of homogeneity) is one of the main advantages of partially premixed combustion over the homogeneous charge compression ignition concept. Stratification can smooth the heat release rate and improve the controllability of combustion. In order to compare stratification levels of different partially premixed combustion strategies or other combustion concepts, an objective and meaningful definition of "stratification level" is required. Such a definition is currently lacking; qualitative/quantitative definitions in the literature cannot properly distinguish various levels of stratification. The main purpose of this study is to objectively define combustion stratification (not to be confused with fuel stratification) based on high-speed OH* chemiluminescence imaging, which is assumed to provide spatial information regarding heat release. Stratification essentially being equivalent to spatial structure, we base our definition on two-dimensional Fourier transforms of photographs of OH* chemiluminescence. A light-duty optical diesel engine has been used to perform the OH* bandpass imaging on. Four experimental points are evaluated, with injection timings in the homogeneous regime as well as in the stratified partially premixed combustion regime. Two-dimensional Fourier transforms translate these chemiluminescence images into a range of spatial frequencies. The frequency information is used to define combustion stratification, using a novel normalization procedure. The results indicate that this new definition, based on Fourier analysis of OH* bandpass images, overcomes the drawbacks of previous definitions used in the literature and is a promising method to compare the level of combustion stratification between different experiments.
机译：相对高的分层（定性：缺乏均匀性）是在均匀电荷压缩点火概念上部分预混合燃烧的主要优点之一。分层可平滑热释放速率并提高燃烧的可控性。为了比较不同部分预混合燃烧策略或其他燃烧概念的分层水平，需要一个目标和有意义的“分层水平”的定义。目前缺乏这样的定义;文献中的定性/定量定义无法正确区分各种层次。本研究的主要目的是基于高速OH *化学发光成像客观地定义燃烧分层（不与燃料分层混淆），这假设提供关于热释放的空间信息。基本上相当于空间结构的分层，我们基于OH *化学发光照片的二维傅里叶变换的定义。光型光学柴油发动机已用于执行OH *带通成像。评估四个实验点，均匀制度中的注射定时以及分层部分预混燃烧制度。二维傅里叶变换将这些化学发光图像转化为一系列空间频率。频率信息用于使用新颖的归一化过程来定义燃烧分层。结果表明，基于OH *带通图像的傅立叶分析的新定义克服了文献中使用的先前定义的缺点，并且是比较不同实验之间的燃烧分层水平的有希望的方法。

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