悬臂式离心泵流固耦合特性研究

Research on fluid-structure interaction characteristics of cantilever centrifugal pump

针对悬臂式离心泵流固耦合问题,采用单向耦合方法,在不同悬臂比、不同工况下,分析叶轮应力、应变的变化规律,获取离心泵在运转过程中最容易发生强度破坏和刚度破坏的位置,并在有预应力和无预应力下,对不同悬臂比离心泵的转子动力学特性进行研究。结果表明:在一定工况下,悬臂比越小,叶轮的变形越小,叶轮后盖板中间流道处最有可能发生刚度破坏,叶片出口边缘与前、后盖板交接处最有可能发生强度破坏;悬臂比越小,离心泵转子系统的固有频率越大,流固耦合作用会降低转子系统的前三阶固有频率。

To address cantilever centrifugal pump fluid-structure interaction problems, we used the one-way cou-pling method to analyze the stress and strain distribution of the impeller with different cantilever ratios and working conditions. We then determined the positions of the centrifugal pump that are most likely to be associated with rigid-ity and strength failure during operation. We also studied the prestressed and non-prestressed centrifugal pump ro-tor’ s dynamic characteristics at different cantilever ratios. The results show that, under a certain condition, the smaller the cantilever ratio, the smaller the deformation of the impeller. In addition, the maximum total deformation usually occurs in the middle flow channel of the hub, the maximum equivalent stress usually occurs in the outlet of the blade and impeller cover junction, and the smaller the cantilever ratio, the greater the natural frequency of the centrifugal pump rotor system. Lastly, the first three natural frequencies of the rotor system are reduced by fluid-structure interaction.