供油压力和滑油温度对某航空齿轮润滑喷嘴射流特性的影响

为了研究供油压力和滑油温度对喷嘴射流扩散角和射流流量的影响，采用基于FLUENT软件的大涡数值模拟方法对喷嘴三维射流流场进行了两相流仿真和单相流仿真，分别通过高速可视化和喷射滑油称重的方法测量了喷嘴射流扩散角和射流流量，并用测量结果对两相流仿真和单相流仿真进行了合理性验证.当供油压力和滑油温度作为多因素单变量分别在0.1~1.0MPa，50~110℃范围内增加时，射流扩散角在沿喷孔轴线距喷孔出口100mm范围内近似为零，并且射流流量非线性增加.结果表明:在喷嘴实际使用工况范围内，供油压力和滑油温度的变化对射流扩散角的影响很小；供油压力和滑油温度的交互作用对射流流量的影响较大；射流流量等值线上存在使供油压力和滑油温度的波动对射流流量的影响最小的供油压力和滑油温度组合. 

Effects of supply pressure and temperature of oil on jet characteristics of lubricating nozzles for an aviation gears

In order to study the effects of supply pressure and temperature of oil on the diffusion angle and volume flow of jet oil sprayed by nozzles, both the two phase flow model and single phase flow model of the jet flow field of three dimensional nozzles were simulated by employing the large eddy simulation based on the FLUENT software. The rationality of the simulation results was demonstrated by the diffusion angle and volume flow of jet oil measured by the method of high speed visualization and weighting jet oil, respectively. The diffusion angle of jet was approximately zero within the scope of 100 millimeters along the axis apart from exit of nozzle and the volume flow of jet oil sprayed by nozzle increased nonlinearly when the supply pressure and temperature of oil varied between 0.1MPa and 1.0MPa, 50℃and 100℃, respectively.Results indicate that the diffusion angle of jet varies very little when the supply pressure and temperature of oil are varying under actual working conditions. The interaction between supply pressure and temperature has a significant effect on the volume flow of jet. There is a combination of the supply pressure and temperature of oil in contour line of volume flow of jet causing the least effect on volume flow of jet when the supply pressure and temperature of oil fluctuate in a small rage.