Research Of Transient Process And Pipe Network Optimization Of Gravity Conduits With Long Distance And Presure

With the rapid development of the national economy and social progress, it is necessary to construct lots of water conveyance project with and large capacity to supply the needs of agriculture, industry and life. For long-distance water conveyance project,analysis for the transient process and protection of piping system is an important technical problems needs to solve;Meanwhile, it is of significance to optimize the design proposal to improve water pressure and water quality as well as save investment, reduce energy use and improve social economic benefits. This article proceeded from analysis and optimization for the transient process of piping system. The main works are summarized as follows:1.This paper discussed the water hammer equations in calculating transition process. Then derived the motion equations and continuity equations based on equations and assumptions for one-dimensional steady flow without water attack.2.Introduced characteristic curve method and computation model of computating boundary conditions in transition process, and discussed the characteristic curve equations. Furter more, The similarity of water transition process were studied and the conclusion were reached that is:without considering friction force inwater transition process, to increase pipeline and the accommodation time with the same proportion would get the same characters as its original state, including flow velocity and pressure rise.3.Combined with the project of gravity irrigation engineering in the south-to-north water diversion project from Xinzhuang harbor entrance to Zhoukou, this paper established a computation model under different boundary conditions by common characteristic line method,then a program is developed with MATLAB.Through the transition process calculation and analysis, protective measures were proposed.4. Finally, this study proposed an optimization method in the design of piping system to build a nonlinear mathematical model by a function about pipe diameter aim at minimum section and enough water supply.then calculation and comparative analysis are made by this model with a gravity irrigation engineering in the south-to-north water diversion project.