高速泵内三维非定常湍流激振计算  

Impact of three-dimensional unsteady turbulence flow in high-speed pumps

作　　者：徐朝晖[1] 吴玉林[1] 陈乃祥[1] 刘宇[1] 张梁[1] 吴玉珍 

机构地区：[1]清华大学热能工程系,北京100084 [2]航天科技集团公司第十一研究所,北京100079

出　　处：《清华大学学报（自然科学版）》2003年第10期1428-1431,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50179018)

摘　　要：针对某一高速泵系统的诱导轮叶片在实际运行时出现裂纹断裂现象,利用三维Navier-Stokes方程和RNG湍流模型,并在转动部件与静止部件间采用滑移网格技术建立交互界面,对高速泵内多级动静干扰引起的三维非定常湍流进行了计算,得到了诱导轮内部流体压力脉动的主要特征。计算结果表明,诱导轮全流道内流体压力脉动的频率成分一致,在某一转速范围内出现与叶片固有频率接近的频率成分,它是造成诱导轮叶片出现裂纹的主要原因。说明利用滑移网格技术及RNG湍流模型,可以模拟三维非定常湍流的激振问题。Cracks in highspeed pump blades were thought to be due to pressure fluctuation in the turbulent flow. Therefore, turbulence flow in a pump was analyzed using the threedimensional NavierStokes equations and the RNG kε model with a sliding interface between the rotor and the stator. Significant pressure fluctuations were observed in the numerical results. The results showed that the frequency of the pressure fluctuations in the pump coincided with rotational speed of the pump. Furthermore, the pressure fluctuation had a frequency component in a range similar to the natural frequency of the pump blade. Therefore, the cracks in the pump blades are thought to be caused by resonance of the fluid pressure fluctuation with the blade vibrations. In general, the impact of the threedimensional turbulent flow on the pump blades can be calculated using the sliding interface and the RNG turbulent model. 

关 键 词：高速泵 三维非定常湍流 动静干扰 叶片裂纹 激振 数值计算 流体机械 

分 类 号：TH310.23[机械工程—机械制造及自动化]