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

• 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

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

人们认为喷射点火器具有点燃发动机气缸中非常稀薄的混合物的巨大潜力。然而，增强的机制尚不清楚，预计自由基的作用可能会引起发动机爆震。本研究项目就是为了明确这一点而进行的。第一年，采用快速压缩机和Livengood-Wu积分来证明效果。接下来的几项是结果。1）首先获得活化能等速率常数。精度比以前报告中给出的值要好得多。2）从压缩开始到冷焰开始沿喷射点火的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区别，即自由基对冷焰开始没有影响。3）出现卷起涡流，点火似乎从它开始。第二年，同样的情况 实验针对宽射流条件进行，并且使用本研究团队开发的电阻丝CT测量温度分布。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区别，即否认了冷焰起始的自由基效应。2）开发了电阻丝CT方法，可以轻松测量瞬态二 封闭室内的空间温度分布。应用于测量快速压缩机中产生的卷绕涡流的温度分布。3）检测到卷绕涡流的温度分布，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发表，第二年的结果将在亚太地区燃烧与能源利用研讨会上发表 JSME，97 年 9 月。它们还将提交给 JSME 交易。较少的

项目成果

K.Wakai, H. Yamasaki, S. Kitoa and I. Sumida: "Effect of Plasma Jet Ignition on the Proflame Reaction at Cool Flame Region" 3rd Asian Pacific International Symposium or Conbustion and Energy Utilization. 1. 883-888 (1995)

K.Wakai、H. Yamasaki、S. Kitoa 和 I. Sumida：“等离子射流点火对冷焰区域 Proflame 反应的影响”第三届亚太国际燃烧与能源利用研讨会。

K.Wakai,et al.: "Effect of Plasma Jet Ignition on the Preflame Reaction at Cool Flame Region" 3rd Asian-Pacific International Symposium on Combustion and Energy Utilization. 1. 883-888 (1995)

K.Wakai等人：“等离子射流点火对冷焰区域预燃反应的影响”第三届亚太燃烧与能源利用国际研讨会。

K.Wakai, H.Yamasaki, S.Kitou, I.Sumida: "Effect of Plasma Ignition on the Preflame Reaction at Cool Flame Region." 3rd Asian pacific International Symposium on Combustion and Energy Utilization. 1. 883-888 (1995)

K.Wakai、H.Yamasaki、S.Kitou、I.Sumida：“等离子体点火对冷焰区域预燃反应的影响”。

K.Wakai and et al: "Effect of Plasma Jet Ignition on the Preflame Reaction at Cool Flame Region" 3rd Asian-Pacific International Symposium on Combustion and Energy Utilization. 1. 883-888 (1995)

K.Wakai等人：“等离子射流点火对冷焰区域预燃反应的影响”第三届亚太燃烧与能源利用国际研讨会。