Optimal Research On The Hydraulic Characteristics Of The Water Supply Pumping Stations For Shanxi Great Water-Network

With the rapid development of social economy,people’s demand for water is getting higher and higher.In the process of urban and rural life and industrial and agricultural production,water plays an indispensable role.The distribution of water resources in China is uneven in time and space,pumping stations is an important water transfer project,which plays an important role and has a great benefits in the process of water transmission and distribution.A large number of water supply pumping stations projects have been built in our country,such as South-to-North water transfer project,Luanhe-Tianjin water diversion project,Dongjiang-Shenzhen water supply project,Jingtaichuan pumping irrigation project.It generally has many characteristics: large flow,high head,long distance,complex water delivery,power consumption and so on.Once water hammer accident occurs,which will cause a great loss to the country and people’s lives and property.we need to study the hydraulic characteristics of water supply pumping stations,which was not only an important task,but also had an important theoretical and practical significance for the safe-economic operation and the development of automation system of pumping stations.At home and abroad,there were some achievements in the research of pumping stations optimal operation,hydraulic transition and water hammer protection.Based on the results of previous studies,this paper had carried out the optimal research on the hydraulic characteristics of pumping stations by combing with the Xin’An Quan water supply system in Shanxi Great Water-Network,the main research contents were as follows:(1)Established the steady-state mathematical models of the same-type pumps under constant speed operation and same-type pumps under variable speed operation and different-type pumps under constant speed operation and different-type pumps under variable speed operation.(2)According to the operation characteristics of Xin’An Quan water supply system,the hydraulic transient mathematical model of the pumps was established.Based on the basic principle of the characteristic line method,which was used to solve the hydraulic transient mathematical model.(3)Established the boundary conditions of the hydraulic control butterfly valve,over-pressure relief valve,air inlet and vent valve,which working principles and characteristics were analyzed,and the corresponding mathematical model were established,which provided the bases for the realization of computer simulation of hydraulic transient calculation underdifferent protective measures.(4)According to the established steady-state mathematical models and hydraulic transition mathematical models and the initial and the boundary conditions,the water supply pumping stations project hydraulic characteristics analysis system software was developed by using Visual Basic 6.0 program language and Microsoft SQL Server 2000 database.(5)Took Hanjiayuan pumping stations of the Xin’An Quan water supply system in Shanxi Great Water-Network as an example,and applied the software to simulate the steady-state and hydraulic transition in order to provide the technical support for the optimal operation and the safe operation and the development of automation system of water supply pumping stations project.The results of this study have been used in the trial operation of Xin’An Quan water supply system,which provide the technical support for the optimal operation and the safe operation and the development of automation system of water supply system,and has a strong practical application value and extension significance.It should be noted that the second water hammer caused by the over-pressure relief valve in the opening and closing process under water hammer conditions in the water supply system need further study.