【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，严重时会影响系统的可靠性。该研究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；在阀瓣运动过程中，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。更多还原

【Abstract】 In practical applications, when the system is operating at low flow rate, a 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 were 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 were emphasized, and it shows 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.更多还原