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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。
For a high-speed pump system, the inducer wheel cracks occur during the actual operation. The three-dimensional Navier-Stokes equations and the RNG turbulence model are used to establish the interactive interface between the rotating part and the stationary part by using the sliding mesh technique. The three-dimensional unsteady turbulence caused by the multi-stage static and dynamic disturbance in the pump was calculated and the main characteristics of the fluid pressure pulsation in the induced wheel were obtained. The calculated results show that the frequency components of the fluid pressure pulsations in the full runner of induction wheel are consistent, and the frequency components close to the natural frequency of the blade appear within a certain speed range, which is the main reason for the crack in the induced wheel. It shows that using the slip-grid technique and the RNG turbulence model, we can simulate the excitation problem of three-dimensional unsteady turbulence.