He Zhixia  Li Detao  Wang Qian

(School of Energy Resources and Power Engineering, Jiangsu University, Zhenjiang 212013)

Yuan Jianping

(Research Center of Fluid Machinery and Engineering, Jiangsu University, Zhenjiang 212013)

Hu Linfeng

(Wuxi Fuel Injection Equipment Research Institute, Wuxi 214063)

Abstract: The multi-dimensional two-phase mathematical model of cavitating nozzle flow is developed for the developed cavitating flow. Thus the three-dimensional numerical simula- tion of cavitating flow in nozzle holes of a vertical multi-hole injector is dealt with . The hole exit boundary of the computational area is extended to outside the nozzle holes for the first time to decrease the effect of the nozzle holes exit on the inside of computational area. At the same time the cavita- ting flow in the various nozzle holes under needle eccentricity is analyzed and studied in detail. Thus it is pointed out clearly  that the cavitating flow in nozzle holes and the effect of the cavitating flow on the flow of the nozzle holes exit and on the fuel spray atomization.

Key words: Multi-hole nozzle  Nozzle holes  Cavitating flow  Three-dimensional numerical simulation   Needle eccentricity

CLC No: TK421.5

江苏省自然科学基金资助项目(BK2003048). Received 20040630, received in revised form 20041020