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Clarification of Mechanism of Unsteady Combustion Phenomena by means of Luminescent Measurement of Chemical Species

通过化学物质的发光测量阐明非稳态燃烧现象的机理

基本信息

批准号：
06650268
负责人：
FUJIMOTO Hajime
金额：
$ 1.22万
依托单位：
Doshisha University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650268/
关键词：
Unsteady combustion [OH] radical Laser induced fluorescence method Soot Elastic scattering method Laser induced incandescence method DI diesel engine スワールサイクル変動

项目摘要

It is very difficult to clarify the mechanism of the unsteady combustion process, because it is proceeding during very short period with simultaneous physical and chemical changes. However, it is capable of modeling on the phenomena, if this mechanism is caught by experiments, and it is expected moreover the development of instruments utilizing the mechanism. From this standpoint, this project was carried out by use of a DI diesel engine with a transparent piston as the representative instrument applying the mechanism. And the objective items were the detection of 2-D statistical spatial distribution of [OH] radical as the representative of chemical species by the method of laser induced fluorescence with the system of Nd : YAG laser and Dye laser, and that of soot relating to [OH] radical owing to the simultaneous application of the elastic scattering method and the laser induced incandescence method with Nd : YAG 1 aser.The following main conlusions are derived from the experiments i … More n these two years :(1) It is possible to catch the 2D spatial distribution of [OH] radical in the flame of unsteady spray by means of the laser induced fluorescence. There was no example of the detection of the radical in this situation.(2) [OH] radical distributes in the wide region of the combustion chamber at the initial stage of combustion, that is, during the period of the pre-mixed burning.(3) [OH] radical shows the high density at the region of soot existence during the period of diffusion burning.(4) The 2D spatial distribution of soot by means of the laser induced incandescence method is corresponding well to that of the elastic scattering method.(5) Soot exists continuously at the envelope of the flame of unsteady spray at the initial stage of combustion.(6) Near the wall of combustion chamber, soot appears always through the combustion period.(7) The re-combustion of soot is active mainly during the period of diffusion burning.(8) There is almost the linear relation between the mean soot diameter and the time passing.It is useful for the construction of model of combustion mechanism of the unsteady spray to apply the experimental results mentioned above as the data base. Less

由于非稳态燃烧过程是在很短的时间内进行的，同时发生物理和化学变化，因此很难阐明其机理。然而，它能够对现象进行建模，如果这种机制被实验捕获，并且预计还将开发利用该机制的仪器。从这个角度来看，这个项目是通过使用具有透明活塞的直喷式柴油发动机作为应用该机制的代表性仪器来进行的。目标项目是用Nd：YAG激光器和染料激光器系统的激光诱导荧光法检测作为化学物种代表的[OH]自由基的二维统计空间分布，以及同时应用弹性散射法和Nd：YAG激光诱导白炽法检测与[OH]自由基有关的烟尘的二维统计空间分布。YAG 1激光器的工作原理，并从实验中得出以下主要结论： ...更多信息（1）利用激光诱导荧光技术可以捕捉到非稳态喷雾火焰中[OH]自由基的二维空间分布。在这种情况下，没有发现激进分子的例子。(2)[OH]自由基在燃烧初期即预混燃烧期间分布在燃烧室的较宽区域。(3)在扩散燃烧过程中，[OH]自由基在碳烟存在区浓度较高。(4)激光诱导白炽法和弹性散射法得到的烟尘二维空间分布有较好的对应关系。(5)在燃烧初期，碳烟在非稳态喷雾火焰的包络线处连续存在。(6)在整个燃烧过程中，碳烟始终出现在燃烧室壁面附近. (7)碳烟的再燃烧主要发生在扩散燃烧阶段。(8)烟粒平均直径与时间的变化几乎呈线性关系，以上述实验结果为基础，可用于建立非稳态喷雾燃烧机理模型。少