Model Test And Numerical Simulation Of Jishixia Power Station Irragation Water Diversion System

China has met a serious problem of water resource shortage and exists water resourcemisdistribution on space and time. With the rapid development of industry and agriculture,water supply requirement increase rapidly together with water pollution andeco-environmental destruction intensify the supply and demand contradiction of waterresource. Water resource has been a bottleneck factor that restricts human existence and socialsustainable development. In order to avoid the limit, our country has spent substantial amountof financial, material, labor resources on long-distance water supply projects. Water deliveryby gravity flow get extensive application because of its energy saving, and become the firstchoose in long-distance water supply projects..Taking the urban design of gravity-transporting water pipe in Jishixia Power Station asan example, this paper discussed the verification of water conveyance ability, head losses ofheterotypic bifurcated pipe, measures to prevent water hammer. Experimental research,numerical simulation and hydraulic calculations were carried out. The research results canprovide scientific guidance and reference for similar projects.In order to study operation of water supply under different working conditions, this papercarried out model tests. In this study, the author used combination of normality upstream anddownstream of the bifurcated pipe and generalization of the other part. The results showedthat head losses of heterotypic bifurcated pipe with different fluxes are basically stable, whenwater is supplied by Jishishan alone, Minhexian alone, or combination of Jishishan andMinhexian. In addition, water capacity can meet the design requirements whatever the waterlevel is. According to the model test results, it can meet the design requirements under variousforms of water supply, and the design is feasible.Based on the model test, the author applied three-dimensional numerical simulation toresearch water form and head losses of the bifurcated pipe. It shows that the maximumdifference percentage of head loss coefficient between model test and numerical simulation is14.45%. Water form of single-tube water supply is better than the double-barreled watersupply. When Jishi direction is involved, a greater turnout appears with more head loss. On the basis of the local head loss coefficient obtained through model test and numericalsimulation, the author carried out hydraulic calculations to determine the pressure distributionof each pipe section. Water pressures of the pipe fluctuate around the water level of thedownstream reservoir within the margin of error under each characteristic water level. Thewater supply system can meet the water supply requirements.Theoretical analysis of the mechanism of water hammer and water hammer protectiontechnology in gravity flow water system is based on the previous implementation ofprotective measures for water hammer effect studies. Suggestion of adding box two-waysurge tower or pressure relief valve in the original design (exhaust valve installed in theexisting design) is proposed through analogized with similar projects.