Development and droplet size characteristics of wall impinging diesel fuel spray at high injection pressure

作     者：龚允怡 李理光 黄叶舟 

作者机构：China National Engine Combustion Laboratory Tianjin 300072 Tianjin University 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：1997年第5期

页      面：97-105页

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Project supported by the National Natural Science Foundation of China 

主　　题：diesel fuel spray droplet size wall impinging high injection pressure. 

摘      要：The characteristics of droplet size and concentration distribution of diesel spray with wall impingement at high injection pressure have been studied experimentally. Two nozzles with different hole diameters in a fuel supply system that consists of pump, pipe and nozzle have been researched. The experiment was carried out under the condition that the air density is similar to that in the engine cylinder. The spray impinges to a flat plate vertically. The temperature of the plate surface is variable. The droplet size was measured by a Malvern particle sizer based on the principle of laser diffraction. When the spray impinges on a room-temperature wall, much of the fuel will accumulate on the wall surface. While in the space over the wall, the smaller the nozzle hole, the smaller the SMD and the droplet density. When the wall temperature is high enough, the droplet of the impinging spray will be rebounded and evaporated. The optimum surface temperature for rebounding and evaporating is about 573 K.