The Study Of Water Flow Modeling Methods Which Adjusted By Valves In City Water Distribute System

As the urbanizing process is accelerating in china, the size of water supply system, which is one of the important infrastructures, becomes larger and larger. It is imperative for the water supply system to take measures of optimal dispatch and regulation. In past it was almost totally depend experience to repair , operate and management, surely can't satisfied the require of modernize for operate and distribute in water supply system. Then in the process of found micro model that needed to found math model of optimal distribute and management of water supply network by theory, thus may truly to do distribute and management for nodes pressure and water flow in network. Base to it, the paper main include under several factors:First: the calculate losses and waterpower character of water pipes.It detail exclaimed the flow character of network and distinguish layer and random flow through Neon's. Introduced thecalculate methods of pipeline water loss and loss coefficient of different regions in network. Detail analysis the speeds pressure> rough water in pipe that affected the change of flow character, while the open degree of valve which in the connected pipe among regions, the decided methods for operate strengths of flow, transfer to flow character by valve after calculate resistance of whole connected pipe. Then to do layer different calculate for whole pipe. Second: water modeling of water supply network Simply introduce the traditional layer different methods of branch ^ circle and mix network. Detail analyses the open degrees of valves while node pressure needed change in the optimal distribute operate of network. Those main included the methods of sensitive degree analysis to decide the valves, which need regulate in network. They use advanced layer different calculate methods to calculate the value of node pressure which after network pressure changed. That may founded the relationship between node pressure and open degree of valves, and then decided the open degree of them.The most important contents focused in this paper1. For irrational distribute of actuality water supply networkthat make micro model can't solved whole problems which exist inwater supply systems, it must to do necessary arrangement formodern network. According to use node pressure to arrangementnetwork, realized regional management, through regions pipe connect among each regional, there are valves in connect pipes through regular the open degree of valves to adjust the water flow and pressure of each regional. The paper main researches the affect of valves open degree to the flow of water supply network system.2.The calculate methods of partial resistance in actuality water supply network, which main choice ways as ignored or added in lines resistance, it will produced some difference for layer different results of network. The paper use some methods or hydraulics to decided the changed flow while open degree changed of valves andthe calculate the resistance of whole connected pipe.3. Add the calculate methods of valve resistance coefficientand disturber range in circle pipe network. Use improved network layer different methods to calculate the pressure of each nodes that after optimal operate of network building the relationship among node pressure and valve open degree then reality to calculated the open degree of valves then revised whole network, then founded the theory basis for actuality realized valve optimal schedule.