多级离心泵多工况压力脉动数值模拟

发布时间：2018-04-24 05:12

本文选题：多级离心泵 + 非定常流动　；参考：《中国农村水利水电》2016年10期

【摘要】：为了研究多级泵中叶轮和导叶的动静干涉现象,采用Ansys CFX软件对某一5级离心泵不同流量工况下非定常流动进行数值模拟,获得并分析了叶轮和导叶内4个典型位置的流动压力脉动分布特性。通过与外特性试验和振动试验结果的对比,验证了数值模拟的可信性。结果表明:各监测点脉动主频560 Hz左右,为2倍叶频处,且振动幅值较大,动静干涉现象强烈;叶轮与导叶交界面的压力脉动强度最大;导叶内压力脉动受叶轮的影响,离叶轮出口越远,压力脉动幅值越小;导叶内在叶频处存在较大峰值,说明叶频是其出口压力脉动的主要成分,流量越小,脉动强度越大。通过掌握压力脉动分布特性,能够为多工况运行的低压力脉动多级离心泵水力设计提供重要的理论依据。
[Abstract]:In order to study the dynamic and static interference of impeller and guide vane in a multistage pump, the unsteady flow of a 5-stage centrifugal pump under different flow conditions was numerically simulated by Ansys CFX software. The distribution characteristics of flow pressure pulsation in four typical locations of impeller and guide vane are obtained and analyzed. The credibility of the numerical simulation is verified by comparing with the external characteristic test and vibration test. The results show that the main pulsation frequency is about 560 Hz, which is about 2 times of the blade frequency, and the vibration amplitude is larger, the dynamic and static interference is strong, the pressure pulsation intensity at the interface between the impeller and the guide vane is the largest, and the pressure pulsation in the guide vane is influenced by the impeller. The farther away from the outlet of the impeller, the smaller the amplitude of pressure pulsation, and the larger the peak value of the frequency of the impeller, which indicates that the frequency of the impeller is the main component of the pressure pulsation at the outlet, and the smaller the flow rate, the greater the pulsation intensity. By mastering the characteristics of pressure pulsation distribution, it can provide an important theoretical basis for hydraulic design of low pressure pulsating multistage centrifugal pump with multiple operating conditions.
【作者单位】：江苏大学流体机械工程技术研究中心;
【基金】：国家自然科学基金(51009072) 江苏省优势学科资助
【分类号】：TH311

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