Study On Gas Migration And Diffusion Characteristics Under The Interaction Of Water - Flow Structure Of Plunge Pool

At present, the water conservancy and hydropower project design thought is still of pursuing the high energy dissipation and energy dissipation work their own security and no serious damage to the downstream riverbed topography and geological main design goal.Especially with the improvement of social environmental protection consciousness, is not only energy dissipation downstream of the dam flood discharge energy dissipation and building security issue, but a higher ecological and environmental protection request, solve the discharge of large power and high speed hydraulics and water environment problem is one of the key to the sustainable development of water resources and hydropower technology in our country.Have been built, under construction in the river basin development and constructing the high dam water conservancy and hydropower engineering, ultra high dam is more, the proportion of super high dam is larger, the discharge energy dissipation caused by the downstream river water, total dissolved gas super saturation effect on the ecological problem is the development of water resources and water ecological environment is one of the key issues of sustainable development.From reservoir flood operation combined with the energy dissipation method and its engineering caused by the drainage of the structure of flow formed by the combination of total dissolved gas research for reservoir flood operation strategies, thus reduce the concentrations of total dissolved gas downstream water protection of river water ecology and water environment, has been built, under construction of water resources and hydropower engineering to reduce flood discharge energy dissipation caused by total dissolved gas super saturation problem looming for operation control strategies.This needs under different fluid flow structure for gas migration, proliferation and release mechanism and the movement mechanism of gas under different fluid flow structure research, to develop different ways of energy dissipation and its combination of flood discharge in guarantee under the premise of building its own security strategy to control and reduce the downstream water dissolved gas concentration research lay the foundation.And the water cushion pond belongs to common energy dissipation downstream of high dam facilities, research the water cushion pond water structure under gas diffusion characteristics has important practical significance and application prospect.Based on the hydraulic model test was carried out on the water cushion pond water partition, research from the flow structure in different section into the pond, tail energy under the condition of height, Angle, flow rate and time of the pressure distribution and the water cushion pond aeration concentration flow structure and the distribution of gas diffusion along the release of the law.The specific research methods are as follows:(1) Within the water cushion pond of observation, flow, water flow inside the pond structure partition;(2) On each flow structure in the water cushion pond area measurements at a velocity, floor when all the pressure, it is concluded that the water flow structure when the velocity distribution of the pressure distribution law;(3) The research into the pond, tail energy, height, Angle on each flow structure in the water cushion pond area, the influence of the aeration consistency specific operation method is:change the energy into the pond, tail height, Angle, any hydraulic conditions, structure zone speed measurement in the water cushion pond water, when all the pressure, the mixed gas density.