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.