柴油机喷雾激波研究

摘要

随着电控共轨喷油系统的广泛应用,喷射压力成倍增长,喷雾速度大于气缸内环境音速,由此产生的激波(shock wave)现象引起国内外学者的浓厚兴趣.本文介绍了激波的基础理论,现阶段激波试验的研究成果,指出当喷油油束速度高于介质环境音速时,激波就会产生,提高介质温度和密度都会抑制激波的产生,最后提出利用弹道光子成像技术应用于激波研究的设想,并对激波的产生机理及如何利用激波改善燃烧性能作进一步的研究.%With the widespread use of electronic control common rail diesel injection system, the jet speed is faster than the speed of sound as the injection pressure increases several fold. The shockwave along with it was studied by researchers at home and abroad. In this paper, we introduce the fundamental theory of shockwave, and the experiment academic achievements during this present period. The experiment results indicate that shock waves are generated when the fuel injection speed exceeds the ambient sonic speed and results also show that increasing ambient temperature and density both inhibit shock wave generation. The paper also points out the assumption of using ballistic photons image technology in shock wave study. We will further study the shock wave generation mechanism and the way to utilize it actively for combustion.