湍流对磨料水射流中磨料颗粒受力的影响

摘要

The flow over a stationary spherical abrasive particle was studied numerically to analyze the effects of turbulent parameters（turbulence intensity and turbulent viscosity ratio） on the drag force of an abrasive particle.Several turbulence models were verified by using the models to analyze the submerged impinging jet.The Reynolds stress model was chosen to simulate the turbulent flow over the abrasive particle.The turbulence intensity varied from 5% to 70% and the turbulent viscosity ratio varied from 1 to 1200.Conclusions can be drawn from the simulation that with the increase of turbulence intensity,the drag force on the abrasive particle increases and with the increase of turbulent viscosity ratio the drag force on the abrasive particle also increases.%为了弄清磨料水射流中磨料颗粒的受力情况,考察了不同湍流模型对淹没冲击射流计算结果的影响,从中选取表现较优越的雷诺应力模型对球形磨料颗粒附近的湍流流动进行数值模拟。计算中,湍流强度为5%～70%,湍流黏度比为1～1200。计算发现,在该计算范围内,随着湍流强度的增大,固相颗粒所受曳力逐渐增大,颗粒的曳力系数增大;随着湍流黏度比的增大,固相颗粒所受的曳力逐渐增大,相应的曳力系数也增大。