Dynamic Simulation And Analysis Of Press Regulation System In Modern Water And Hydroelectric Engineering

The Press-Regulation facilities have very important function in water and hydraulic engineering.But for the resemble standards of complex flow hard to meet the demand,this limit the method of model experiment,so the method used to demonstrate feasibility of Press-Regulation facility is mainly numeric simulation.According to these, transient simulations of several water and hydraulic engineerings with Press-Regulation facility has been studied. Such as Air-Cushioned Surge Chamber , Inclined Ceiling Tailrace, Siphonic Pump Station. And then some reference conclusions are offered.Transient simulations of several hydropower stations with mixed Free-Surface-Pressure flow such as Xiangjiaba and Xiluodu are studied.Also surge plan is compared with inclined ceiling tailrace plan for Xiangjiaba station.The result declare that when tailrace is short than some length, the surge can be replaced by inclined ceiling tailrace,for this is less investment and better property.The inclination of tailrace has noticeable influence for the max press in tailrace.Enlarge the inclination properly can decrease the max press. Max press appear at the case that when the downstream waterline is about locate the centeral part of the tailrace ceiling. In siphonic pump station system, the state of water flow and the siphonic process is very complex at the section of siphonage,and there is not a satisfactory model untill now.In this paper a new model has been offered.This model is base on the method of simulating the section of siphonage with spilling surge tank.And then dynamic simulate models of the siphonic pump station system was offered. With these models, transient simulation of a pump station of interior diversion work is studied, and results meet the actual in pump station.This has a important reference value in some measure.Transient simulations of hydropower station with Air-Cushioned Surge Chamber declare that the gas in air chamber match heat insulation condition when calculate the max press of system,and match constant temperature condition when calculate the max level of Surge Chamber.The design of air chamber's volume should base on thevolume which system is steady when small wave occur.This has significant influence to design of air chamber's volume.State equation of hydropower station with surge is build in the article.The stability of the turbine regulating system and it's dynamic characters can be determined and analysed,which can provide the basis for readjustment of the regulating parameter.