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

很难阐明不稳定混合物过程的机制，因为它在很短的时间内进行了很短的时间，并具有简单的物理和化学变化。但是，如果这种机制是通过实验捕获的，并且预计利用该机制的工具的开发也可以在现象上进行建模。从这个角度来看，该项目是通过使用带有透明活塞的Di柴油发动机作为应用机制的代表仪器进行的。并且客观项目是通过激光诱导的荧光方法检测[OH]根部作为化学物种的代表，该方法与ND：YAG激光和染色激光的系统，以及与[OH]与[OH]造成的烟灰的同时应用于弹性散射方法以及激光诱导的Insands YND的主要应用。串联源是从这两年的实验i…中得出的：（1）可以通过激光诱导的荧光来捕获[OH]自由基在非稳定喷雾剂中的2D空间分布。在这种情况下，没有任何例子检测到根本。（2）[OH]在混合物初始阶段在组合室的宽区域中进行了根本分布，也就是说，在预混合的燃烧期间。（5）在结合室的初始阶段不稳定喷雾剂的信封上连续存在烟灰。（6）在组合室壁附近，烟灰总是在组合期间出现。对于不稳定喷雾的组合机制模型的构建非常有用，以将上述实验结果作为数据库。较少的