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| 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 |
1.College of Power and Energy Engineering, Harbin Engineering University, Harbin 150000, China;
2.College of Energy, Xiamen University, Xiamen 361000, China;
3.Science and Technology on Thermal Energy and Power Laboratory, Wuhan Second Ship Design and Research Institute, Wuhan 430205, China |
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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.
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Received: 08 November 2021
Published: 28 February 2023
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