摘要
利用多相流空穴模型对喷油嘴稳定喷射时喷孔内的空穴流动现象进行了三维数值模拟,分析了空穴在喷油嘴内的形成机理及其分布情况,,基于此模型进一步研究了喷油压力、背压及喷孔入口圆角半径与喷孔k系数对喷孔内部空穴分布的影响。通过模拟计算可知,喷射压力降低和背压增加、增大喷孔入口圆角半径及喷孔k系数后,喷孔内空穴将减小。
In this paper , using multiphase cavitation flow model, 3D numerical simulation was done to the fully developed cavitation flow in a nozzle at steady spray. The formation mechanism and distribution of cavitation inside the nozzle were analyzed using multi. phase flow model coupled with cavitation model. Based on this model, the effects of injection pressure, back pressure, inlet round angleradius ratio and k-factor of nozzle, on the distribution of the cavitation inside the nozzle are analyzed. Simulation results show that less cavitations intensity can be realized by decreasing the injection pressure, enhancing back pressure or enhancing the nozzle inlet round angle-radius ratio and k-factor.
出处
《现代车用动力》
2011年第4期29-35,49,共8页
Modern Vehicle Power
关键词
喷油嘴
空穴流动
数值模拟
nozzle
cavitation flow
numerical simulation
