Lip Bottom - Flow Dissipation Structure Different Studies Aeration Flow Characteristics

In recent years, along with the progress of science and technology, construction of the high dam in the world is increasing. The common traits of these project flood discharge are, high head, large flow, and large velocity. Because of high head, flow rate, plus the topographic, geologic conditions are complex, Dam flood discharge and energy dissipation issues become particularly prominent. Based on the step-down bottom energy dissipater, is a way to adapt to the new energy dissipation with high head and large discharge, has a higher efficiency rate.In the underflow energy dissipation, Discharge structures when they crossed the stream, because of high head, flow, or water surface or abrupt flow boundary, Cause a lot of air mixed with the water in the formation of aerated water flow. In this case, strong flow and gas mass exchange between the bubbles, the air bubble has contributed the majority of gas delivery quality. In strong turbulence in aerated water, air bubble coalescence occurs constantly, such as split and dissolved. Based on stream at the end of the step-down bottom energy dissipater, after the aeration of water flow, stilling pool depth increased, in the design of stilling pool size (for example, stilling basin base plate thickness, height of the side-wall of stilling) should take into account effects of aeration, if aerated flow and aerated water depth point location underestimated, it will directly affect the project investments, also threatens the safety of buildings; In addition, when the aerification current of water approaches bottom aerification density is bigger than7%may reduce the cavitations’erosion destruction; water aeration can also improve downstream erosion, and so on. Therefore the ridge undercurrent of research of aerification current of water to falling disappears to be able the design of labor to have the important meaning.This paper bases on hydraulics experiment, observe and record the data in the stilling pool, focusing on flood flow patterns at the end of air entrainment characteristics of different flow structure within the pool under study.Includes ground roller, impact area, the wall-attached jet area, free turbulent Jet rolled dough flow area. Obtained the concentration of aerated water flow distribution within the partition under the different experimental conditions, relocation diffusion mechanism of mixed gas, several conclusions.