Effect of Incident Angle of Wear-Ring Clearance on Pressure Pulsation and Vibration Performance of Centrifugal Pump
Effect of Incident Angle of Wear-Ring Clearance on Pressure Pulsation and Vibration Performance of Centrifugal Pump
复制标题
磨环间隙入射角对离心泵压力脉动和振动性能的影响
DOI：
10.3389/fenrg.2022.861134
复制
发表时间：
2022-03-29
影响因子：
3.4
通讯作者：
Zhu, ZuChao
中科院分区：
文献类型：
--
作者：
Jia, XiaoQi;Yu, Jilin;Zhu, ZuChao
磨环是离心泵的重要部件。磨环间隙内的泄漏流与叶轮入口处的主流形成相互垂直的交叉混合流。由于速度差大、方向不同，在两股水流交汇处产生较大的涡流和激波，造成流动损失、非定常流动，甚至引起流激振动。因此，泵的性能、压力脉动和振动等特性都会受到很大的影响。本文以低比转速离心泵为研究对象，建立了磨环间隙入射截面与叶轮进口圆周方向的5个入射角，即原入射角(90度)、75度、60度、45度和30度。对不同磨环间隙的离心泵进行了非定常流动计算和流固耦合计算，分析了磨环间隙入射角对离心泵压力脉动分布和振动性能的影响。结果表明，改进的磨环间隙出流角可以有效地减弱磨环间隙泄漏流对进口主流的冲击扰动。从而改善了离心泵进口的流动状况，减少了流动损失，提高了离心泵的效率，降低了泵的振动幅值和振动能量。
A wear-ring is an important part of the centrifugal pump. The leakage flow in the wear-ring clearance and main flow at the impeller inlet form crossed mixed flows perpendicular to each other. Large eddies and shocks are produced at the intersection of the two flows due to great velocity difference and different directions, resulting in flow losses, unsteady flow, and even flow-induced vibration. Consequently, the pump performance, pressure pulsation and vibration, and other characteristics will be greatly affected. In this paper, 5 incident angles between the incident section of the wear-ring clearance and the circumferential direction of impeller inlet, i.e., the original angle (90 degrees), 75 degrees, 60 degrees, 45 degrees, and 30 degrees, were formed with a low-specific-speed centrifugal pump as the study object. Unsteady flow calculation and fluid-structure interaction calculation were performed on centrifugal pumps with different wear-ring clearances; the effect of the incident angle of the wear-ring clearance on the distribution of pressure pulsation and vibration performance of centrifugal pump was analyzed. The results showed that the improved efflux angle of the wear-ring clearance could effectively weaken the impact disturbance of the leakage flow in the wear-ring clearance to the main flow at the inlet. Accordingly, the flow status at the inlet of the centrifugal pump was improved, flow losses were reduced, the efficiency of the centrifugal pump was improved, and the vibration amplitude and vibration energy of the pump were also reduced.