Fundamental Study on Next Generation Internal Combustion Engine Applying Hydrogen Flame Jet Igniter

在项目的第一年，研究了NOx的生成量、普通点火与氢火焰喷射点火对置壁面热流密度的差异、氢氧混合火焰喷射代替氢空气混合火焰喷射时对置壁面热流密度的变化。利用快速压缩机对汽车点火和普通点火方式的稀燃极限进行了研究和比较。今年对空腔内的热流进行了实验分析。此外，预测氢气点火方法可能性的计算机程序将成为下一代内燃机的一个强有力的组成部分。作为总结，下面的项目结束。(1)建议对产生氢火焰射流的空腔进行冷却，否则容易被主燃室气体回流加热而发生早燃。(2)甲烷-空气混合物是一种很难自燃的混合物，本实验在压缩比为6 ~ 20的范围内未观察到爆炸现象。(3)在当量比（φ）= 0.4时达到稀燃极限，而在部分道路上要求的φ= 0.33时不能点火。但由于存在一些与装置有关的现象，对装置进行改进后，氢火焰喷射点火器可以点燃更稀薄的混合物。(4)编制了热机循环热力学分析的计算机程序。预测了氢火焰喷射点火用于新一代发动机的可能性。但实验提供的数据基础不充分，目前无法预测。该项目组实验室正在建设数据库，不久就可以进行分析。

First year of this project, amount of NOx generation, difference of heat fluxes at oppsite wall between ordinary ignition and hydrogen flame jet ignition, heat fluxes at above positions with hydrogen-oxygen mixture flame jet instead of hydrogen-air mixture are investigated. With rapid compression machine, lean limits of auto ignition and ordinary ignition method are investigated and compared. This year, heat flux in a cavity is experimentally analysed. Moreover, computer programm which can predict the possibility of hydrogen get ignition method can be a strong part of next generation internal combustin engine. As a summary, next items are concluded.(1) It is suggested that cavity which generate hydrogen flame jet should be cooled, otherwise preignition can be happen because this part can be easily heated by back flow of main chamber gas.(2) Methane air mixuture is originally very hard to be auto-ignited and in this experiment no explosion was observed at compression ratio is from six to twenty.(3) Lean limit of ignition attains at equivalence ratio (φ)= 0.4 and it was impossible to ignite at φ= 0.33 which is required for car engine at partial road. However it might be under some apparatus dependent phenomena and the apparatus is improved at this point, much leaner mixuture can be ignited by hydrogen flame jet igniter.(4) Computer program to analyse the heat engine cycle thermodynamically is established. It can predict the possibility of new generation engine by hydrogen flame jet ignition. However, the data base offered by experiment is not sufficient and it is impossible to predict at present. The data base is undere construction at this project teams laboratory and soon it can be analysed.