小流量工况泵阀耦合系统失稳机理研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (4) : 137-144.

论文

小流量工况泵阀耦合系统失稳机理研究

于涛1，率志君1，王曦1，简洁1，李玩幽1，姜晨醒2，肖颀3

作者信息 +

A study on instability mechanism of a pump-valve coupling system in low flow rate

YU Tao1，SHUAI Zhijun1，WANG Xi1，JIAN Jie1，LI Wanyou1，JIANG Chenxing2，XIAO Qi3

Author information +

文章历史 +

摘要

在实际应用中，当泵阀耦合系统在小流量偏工况下运行时，系统容易发生流动失稳，并伴有剧烈的结构振动，严重时影响系统的可靠性。本文基于动网格和滑移网格技术，对泵阀耦合系统在小流量工况下的非稳态流致激励特性进行了数值模拟，并进行了试验验证。结果表明：由于离心泵导叶区域的周期性堵塞，流场内部出现低频压力脉动；离心泵的出口压力波动直接影响阀瓣所受流体力，导致弹簧止回阀发生颤振现象；阀瓣运动过程中，阀杆处的节流作用是引起泵阀耦合系统流量脉动的主要原因。综上分析表明离心泵和弹簧止回阀之间存在强烈的耦合作用，该研究可为泵阀系统耦合设计与优化提供理论指导。

Abstract

In practical applications, when the system is operating at low flow rate, the pump-valve system is prone to instability along with severe structural vibration, which affects system reliability in serious cases. The unsteady excitations of the pump-valve coupling system in low flow rate are studied by using dynamic grid and sliding grid technology, and validated by experiments. Research shows that due to the periodic blockage of the guide vane area, low-frequency pressure pulsation appears. The movement and force of the valve disc are emphasized, and it showed that the pressure fluctuation of the outlet directly affects the fluid force on the valve disc, making it to flutter. The throttling effect at the hollow stem is the main cause of flow pulsation in the pump-valve coupling system. The above analysis shows that there is a strong coupling effect between the centrifugal pump and the spring check valve. This research can provide theoretical guidance for the design and optimization of the pump-valve coupling system.

导出引用

于涛1，率志君1，王曦1，简洁1，李玩幽1，姜晨醒2，肖颀3. 小流量工况泵阀耦合系统失稳机理研究[J]. 振动与冲击, 2023, 42(4): 137-144

YU Tao1，SHUAI Zhijun1，WANG Xi1，JIAN Jie1，LI Wanyou1，JIANG Chenxing2，XIAO Qi3. A study on instability mechanism of a pump-valve coupling system in low flow rate[J]. Journal of Vibration and Shock, 2023, 42(4): 137-144

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