Water Hammer Simulation Study Of Xiwu Pumping Station In Shanxi Province

The long-distance pumping station water transfer project is a water conservancy project that uses water pumping stations and pressurized pipelines for water transportation.It plays an important role in water resources allocation,inter-basin water diversion,urban and industrial and agricultural water supply,etc.Necessary engineering measures for differences.Long-distance pressurized water pipelines have the advantages of less water loss,convenient operation and maintenance.However,when a power grid accident or a natural disaster such as lightning,heavy rain or the like causes a sudden shutdown of the pump unit,the hydraulic system is prone to sudden pressure rise and decrease in the pipeline system.A bursting accident occurs when the water supply system is difficult to withstand changes in pressure.Whether as an intake and exhaust and water hammer protection for primary or secondary equipment,air valves are now an important hydraulic component and mainstream product in water supply systems.Therefore,in-depth study of the hydraulic transition process of the pumping station system,the mechanism and effect of the air valve protection water hammer,is essential for the construction of the large water network and the safe and large upgrade of the national large and medium pumping station system.Based on the existing researches at home and abroad,this paper simulates the operation conditions of pumping water hammer accidents in Xiqiao Pumping Station.The main contents of this study include:1.Based on the structure and hydraulic characteristics of the air valve,the system explains its working principle,layout principle and problems that are easy to exist in the actual project;2.Using the basic theory of transient flow and the characteristic line method,the water hammer calculation model of the pressurized water pipeline is deduced.In view of the complexity of the air valve inlet and exhaust process,the air valve model is derived based on the ideal gas state equation.3.Combining the water hammer calculation and the joint control of the liquid control butterfly valve + air valve with the Xinanquan reconstruction and expansion project with typical long-distance water delivery characteristics,the valve control law of the liquid control butterfly valve is optimized,and the installation type,quantity and position of the air valve are determined.Provide theoretical basis for the safe operation of Xiqiao pumping station;4.Conduct sensitivity analysis on key hydraulic parameters(roughness,moment of inertia)of long-distance water transfer project,in order to give reasonable suggestions for engineering design,operation and management;5.Using the mature commercial software-Fluent to simulate the air valve,in order to provide ideas for air valve design and air valve dynamics research;The research results can provide theoretical support for the water hammer protection water hammer of Xiqiao Pumping Station,and can also provide reference for similar long-distance pumping station water supply project.In addition,it can provide ideas for air valve runner design and dynamic characteristics research.The three-dimensional water hammer simulation and air valve flow path improvement have laid the foundation for further research.