基于流固耦合的液环泵转子动力学特性分析

Dynamic characteristics analysis of liquid ring pump rotor based on fluid-structure interaction

为了分析液环泵内非稳态气液两相流引起的转子结构响应特性,基于数值模拟与试验测试相结合的方法,对液环泵转子部件进行流固耦合应力应变分析,分析了叶轮不同叶片的应力及变形量分布特征、旋转角引起的非稳态特性、转子部件的模态特性。结果表明:当叶片尖部与壳体内壁距离最小时,其最大等效应力为最大值,随着旋转角的增大,叶片的最大等效应力先减小后增大,叶片的最大变形量随着转角与最大等效应力的变化趋势完全一致,当α=0°,Qm=0.05 kg/s时,叶片最大变形量与最大等效应力分别为1.381 mm、180.96 MPa;叶轮沿圆周方向18枚叶片上的最大应力分布各不相同,且随着叶轮旋转角的逐渐增大,叶片的最大变形量整体上先减小后增大;叶片上的变形量分布沿径向由轮毂到叶尖近似呈线性逐渐增大,应力沿径向方向先急剧增加后缓慢减少,且在0.1r2位置处达到最大值。研究结果可为液环泵的优化设计提供参考。

In order to analyze the response characteristics of rotor structure caused by unsteady gas-liquid two-phase flow in liquid ring pump,the fluid-solid coupling stress-strain analysis of the rotor part of the liquid ring pump was carried out based on the numerical simulation and experimental test.The stress and deformation distribution characteristics of different impeller blades and the unsteady characteristics caused by the rotation angle were analyzed.The modal characteristics of the rotor part were analyzed.The results show that the maximum equivalent stress is the maximum when the distance between the tip of the blade and the inner wall of the casing is the smallest.With the increase of rotation angle,the maximum equivalent stress of the blade decreases first and then increases.The change trend of the maximum deformation of the blade with the angle is completely consistent with that of the maximum equivalent stress,whenα=0°and Qm=0.05 kg/s,the maximum deformation and the maximum equivalent stress are 1.381 mm and 180.96 MPa,respectively.The maximum stress distributions of the 18 blades along the circumferential direction of the impeller are different,and the maximum deformation of the blade decreases first and then increases as the impeller rotation angle increases.The deformation distribution of the blade increases linearly along the radial direction from the hub to the tip.The stress increases sharply first and then decreases slowly along the radial direction,and reaches the maximum at 0.1r2.The research results can provide reference for the optimization design of liquid ring pumps.