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| Long-distance water hammer protection of pipeline after pump being first lowered and then raised |
| DU Chang1, LIU Xiyuan2, ZHANG Jian1*, Wang Baoluo3, CHEN Xuyun1, YU Xiaodong1 |
| 1. College of Water Resources andHydropower, Hohai University, Nanjing, Jiangsu 210098, China; 2. Management Service Center of Hangjiahu South Drainage Project, Jiaxing, Zhejiang 314000, China; 3. Zhejiang Provincial Water Conservancy and Hydropower Survey and Design Institute, Hangzhou, Zhejiang 310002, China |
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Abstract The long-distance water transmission system of the long-distance water transmission system after the pump is prone to negative pressure when the pump is de-energized. a pump-stop water hammer protection scheme of pressure regulating tower combined with end regulator valve was proposed, and a mathematical model of the hydraulic transition process was established based on the characteristic line method of transient flow calculation to simulate the whole process of pump-stopping water hammer. Combined with the actual project, the minimum area of the pressure regulating tower of the conventional pressure regulating tower protection scheme was explored, and the parameter selection principle of the water hammer protection scheme of the pressure regulating tower set after the pump combined with the end regulator valve linkage was given, and the influence of the water hammer protection scheme of the conventional scheme and the water hammer protection scheme of the pressure regulating tower set behind the pump combined with the end regulator valve linkage closure on the water hammer of the pump was stopped. The results show that the area of the conventional scheme voltage regulating tower is 1 100 m2. The protection scheme of the pressure regulating tower combined with the lin-kage closing of the end regulator valve will cause the pipeline positive pressure to be too large, while it closes so slow as to lead to insufficient water flow return capacity of the pipeline, select the appropriate end regulator closing time, under the premise of meeting the system water hammer protection standards, the area of the pressure regulating tower can be effectively reduced.
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Received: 27 April 2022
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