Combustion Augmentation of Low Quality Fuel by Small Amount of Hydrogen

低质量燃料的少量氢气助燃

基本信息

批准号：
03650180
负责人：
WAKAI Kazunori
金额：
$ 1.34万
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 General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650180/
关键词：
Combustion Ignition Lean Mixture Low Quality Fuel Limit of Inflammability Methanol Flame Jet Radicals パルスジェットプラズマジェット水素燃焼促進

项目摘要

The first year, next items were made clear using lean propane-air and methanol-air mixture as a low quality fuels with constant volume combustion chamber. (1) The combustion duration of mixture whose equivalence ratio is 0.6 can be reduced to the same duration as stoichiometric mixture by a hydrogen-air flame jet from a very small cavity whose volume is only 1% of main chamber. (2) Moreover, the combustion duration of very lean mixture (a little leaner than the lean limit of in-flammability) can be reduced to the same duration as mentioned above by a hydrogen-oxygen flame jet from the smaller cavity whose volume is only 0.5% of main chamber.Those results were discussed at the 1992-IPEC(International Power Engineering Conference).In the first half of this year, the effect of ignition location in the cavity was studied. The objective of the research was to make clear the effect of radicals in hydrogen jet flames. When it is ignited at the nozzle, most of jet is composed by burnt gas and the concentrations of radicals are expected much less than that ignited at the bottom of the cavity. The results were presented at the JSME/KSME joint thermal engineering conference and it was concluded that the tendency of reduction of combustion could be explained by the radical effect but it is easier to explain by a effect of jet strength, namely turbulence in a main chamber generated by the strong jet.In the last half of this year, the effect of radical concentrations in jet flame was investigated under the same jet flame speeds. It was performed to make clearer the main factor (radicals or turbulence) of combustion augmentation done by a kind of jet flame. The plasma jet was also added into the hydrogen flame jet. The result showed that the effects of radicals are minor factors and the strength of the hydrogen jet flame is the main factor that can reduce combustion duration. The results will be presented at the 7th IPC (International Pacific Congress on Automotive Engineering).

第一年，明确了使用贫丙烷空气和甲醇空气混合物作为定容燃烧室的低质量燃料的下一个项目。 (1)当量比为0.6的混合物的燃烧持续时间可以通过从体积仅为主室1%的非常小的腔体喷射氢空气火焰喷射而缩短至与化学计量混合物相同的持续时间。 (2) 此外，通过从体积仅为主腔室的0.5%。这些结果在1992-IPEC（国际电力工程会议）上进行了讨论。今年上半年，研究了腔体内点火位置的影响。该研究的目的是明确氢喷射火焰中自由基的影响。当它在喷嘴处点燃时，大部分射流由燃烧气体组成，并且自由基的浓度预计远低于在腔底部点燃的浓度。结果在 JSME/KSME 联合热工会议上公布，得出的结论是，燃烧减少的趋势可以用自由基效应来解释，但用射流强度的效应（即主燃烧室中的湍流）更容易解释。今年下半年，在相同的射流火焰速度下，研究了射流火焰中自由基浓度的影响。进行它是为了更清楚由一种喷射火焰实现燃烧增强的主要因素（自由基或湍流）。等离子射流也被添加到氢火焰射流中。结果表明，自由基的影响是次要因素，氢喷射火焰的强度是缩短燃烧持续时间的主要因素。研究结果将在第七届IPC（国际太平洋汽车工程大会）上公布。