Experimental Research And Optimization Of The Main Dam Sluice At Shahe Reservoir

During flood discharge of the main dam sluice at Shahe Reservoir, the upper water level of the sluice is high, and elevation of the sluice baseboard is 14.5 meters, higher than that of flood discharge river bed. Moreover,the max energy dissipation water head is close to 18 meters, so the hydraulic cohesion fall is large.Therefore, the energy dissipation and scour protection of stiller during flood discharge is particularly outstanding. According to the comparison of different design proposals, the design institute adopts the combined two hydraulic energy dissipation principles of" hydraulic drop " and " hydraulic Jump ", and combines the multi-stepped drop and deepen energy dissipater structures, then forms a hydraulic design of compound spillway which fuce the " hydraulic drop energy dissipation" and " hydraulic Jump energy dissipation".In order to prove the rationality in engineering pivot arrangement and the feasibility of project on energy dissipation, a integral model of this sluice is built. Based on the problems aroused in the process of test,some suggestions and countermeasures are porposed for optimum design, considering the safety in the operation of the main dam sluice at Shahe Reservoir.The main task of this paper is described as follows:The advantages and disadvantages of several kinds of energy dissipation patterns are discussed. Furthermore, the current development of energy dissipation patterns in the world is summarized.Some common problems are studied which appears in the design of hydraulic jump dissipaters for small Froude number flow. Besides that,the features and problems to solve of the same kind of building are also studied.Considering the characteristics of release works for the main dam sluice at Shahe Reservoir, the purposes and missions are established. Moreover,according to the gravity similar principle, an integral model is designed and bulit for the testing of six-stepped energy dissipater.The waterflow patterns,water surface profile,pressure and velocity of folw distributing of the energy dissipater under different conditions are observed. Based on the experimental research and comparing several projects, an opitmized body conformation scheme for the configuration of energy dissipater is proposed.At the same time,based on the standard k-εturbulence model respectively, using FLUENT software, the results of simulation agree well with that of tests. The research achievements in this paper have practical values on hyduaulic project,and apply to the main dam sluice at Shahe Reservoir, what's more, those have an important reference value for the same type of release works.