超高压燃油喷雾特性及诱导激波传播特性的试验研究

Experimental Investigation on the Diesel Spray and Induced Shock Waves Characteristics Under Super High Injection Pressure

在现代柴油机的研究中,提高喷射压力对于改善射流雾化效果及燃烧性能具有重要意义。本文通过自主搭建的超高压燃油喷雾系统,对超高喷射压力条件下射流雾化宏观特性(喷雾贯穿距、喷雾锥角)进行研究。采用纹影系统和高速摄影仪相结合的实验系统,得到超高喷射压力条件下的喷雾图像,并在喷雾体前端捕捉到激波现象。本文主要研究在超高喷射压力下的激波传播特性,包括激波角、多重激波现象等。通过本实验研究,得到超高喷射压力下的激波传播特性,探索超高压对诱导激波的影响规律。

In accordance with the goal of further enhancing of modern diesel engine,increasing injection pressure has important implications for the improvement of atomization effect and combustion performance.The macroscopic characteristics of diesel spray（spray penetration,spray cone angle） under super high injection pressure are investigated via a super high injection system in this paper.The diesel spray images are recorded by the high speed camera,and the induced shock waves generated around the spray is captured by the Schlieren system.The results of propagation characteristics of induced shock waves,such as shock wave angle and multiple shock waves are obtained.Through this experimental investigation,the effects of super high injection pressure on the diesel spray characteristics and induced shock waves are discussed.