Effect of Jet Ignition on the Flame Propagation Process of Premixed Compressed by Piston

射流点火对活塞预混压缩火焰传播过程的影响

基本信息

批准号：
07650249
负责人：
WAKAI Kazunori
金额：
$ 1.47万
依托单位：
Faculty of Engineering, Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650249/
关键词：
combustion ignition compressed gas jet ignition cool flame radical knocking jet ignition

项目摘要

Jet igniters have been thought to have a big potential to ignite very lean mixtures in the engine cylinder. However the mechanism of the enhancement is not made clear and the radical's effect is anticipated that it might induce the engine knocking. This research project is done to make clear this point. In the first year, Rapid Compression Machine and Livengood-Wu integral was employed to prove the effect. Next items are the result.1) Rate constants like activation energy are obtained first. The accuracy is much better than those values presented in the previous repots.2) Integrated amount of rate equation (which corresponds Livengood-Wu integral) from the compression start to the cool flame onset along the combustion history of the jet ignition doesn't differ from that of normal ignition case, namely, the radical doesn't affected on the cool flame onset.3) There appears a roll-up vortex and the ignition seems to start from it.In the second year, the same experiment was performed for w … More ide range of jet condition, moreover the temperature distribution is measured using resistance wire CT which was developed by this research team.1) Radical effect was increased to make plasma jet energy bigger and to make jet nozzle diameter bigger, however the Livengood-Wu integral didn't differ from conventional ignition cases, namely, the radical effect on the cool flame onset was denied.2) Resistance wire CT method was developed to easily measure transient two dimensional temperature distribution in a closed chamber. It was applied to measure temperature distribution of roll-up vortex which was generated in the rapid compression machine.3) Temperature distribution of roll-up vortex was detected but is was not strong distribution and the bulk temperature was a good approximation for the real temperature.Results of first year were presented on the 3rd Asia-pacific International Symposium on Combustion and Energy Utilization and the results of second year are going to be presented on the symposium of internal combustion held by JSME in Sept. '97. They are also going to be submitted to JSME transactions. Less

喷射点火器被认为具有点燃发动机气缸中非常稀薄的混合物的巨大潜力，但是其增强的机制尚不清楚，并且预计其激进的效果可能会引起发动机爆震。明确这一点，第一年采用快速压缩机和Livengood-Wu积分来证明效果。1）首先获得活化能等速率常数，精度比这些值好得多。提出于2）从压缩开始到冷焰开始沿喷射点火燃烧历史的积分速率方程（对应于Livengood-Wu积分）与正常点火情况没有什么不同，即根式不影响冷火焰的开始。3）出现卷起涡流，点火似乎从它开始。第二年，在宽范围的射流条件下进行了相同的实验，而且温度分布使用本研究团队开发的电阻丝CT进行测量。1）增加自由基效应，使等离子体射流能量更大，喷嘴直径更大，但Livengood-Wu积分与传统点火情况没有什么不同，即2)提出了电阻丝CT法，可以方便地测量封闭室内的瞬态二维温度分布，并应用于测量封闭室内产生的卷绕涡流的温度分布。快速压缩3）检测到卷绕涡的温度分布，但分布不强，整体温度很好地逼近真实温度。第一年的结果在第三届亚太燃烧与能源利用国际研讨会上公布第二年的结果将在97年9月JSME召开的内燃机研讨会上公布，并提交JSME交易。