Experimental Study on Operational Stability of Centrifugal Pumps of Varying Impeller Types Based on External Characteristic, Pressure Pulsation and Vibration Characteristic Tests
Experimental Study on Operational Stability of Centrifugal Pumps of Varying Impeller Types Based on External Characteristic, Pressure Pulsation and Vibration Characteristic Tests
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基于外特性、压力脉动和振动特性试验的不同叶轮型式离心泵运行稳定性试验研究
DOI：
10.3389/fenrg.2022.866037
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发表时间：
2022-03
影响因子：
3.4
通讯作者：
ZuChao Zhu
中科院分区：
文献类型：
--
作者：
XiaoQi Jia;Qingyang Chu;Li Zhang;ZuChao Zhu
本研究分别对闭式叶轮模型、半开式叶轮模型和开式叶轮模型进行了外特性、动压和振动试验，以研究叶轮结构对泵运行稳定性的影响。研究结果表明，三种叶轮的外特性在低流量下均具有较好的稳定性，外特性曲线较为平缓。随着流量的增加，外特性的稳定性减弱，开式叶轮的稳定性最差，而闭式叶轮在大流量下的稳定性最好。此外，由于叶片与机舌之间的动静干涉，机舌附近产生强烈的压力波动，导致机舌附近和泵出口处出现较大幅度的压力脉动。可以看出，闭式叶轮在机匣舌部区域的压力脉动稳定性最好，开式叶轮的压力脉动稳定性最差。闭式叶轮机匣振动最小，半开式叶轮次之，开式叶轮机匣振动最大。此外，在转子振动稳定性相似的闭式叶轮、半开式叶轮和开式叶轮中，转子振动稳定性最佳。
This study performed external characteristics, dynamic pressure, and vibration tests on the closed impeller model, semi-open type impeller model, and open impeller model in order to study the influence of the impeller structure on the operational stability of the pump. According to the research findings, the external characteristics of the three impellers enjoyed favorable stability with flat curves under low flow rates. As the flow increases, the stability of the external characteristics weakens, and the poorest stability can be observed in the open impeller, while the enclosed impeller has the best stability under a large flow rate. In addition, intense pressure fluctuations arise near the casing tongue due to the dynamic and static interference between the blade and the casing tongue, causing a large amplitude of pressure pulsation near the casing tongue and the pump outlet. It can be seen that the stability of pressure pulsation of the closed impeller in the casing tongue area was the best, whereas the stability of pressure pulsation of the open impeller was the poorest. The minimum casing vibration can be found in the closed impeller, followed by the semi-open impeller, and the open impeller, with the maximum vibration. In addition, the optimum stability of rotor vibration can be observed in the closed impeller, semi-open impeller, and open impeller with similar stability of rotor vibration.
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