摘要
Abstract
In order to study and optimize the shape of the inlet and outlet and forebay of pumped storage power station,the three-dimensional numerical simulation of the inlet and outlet flow field is carried out by using the Realizable k-ε turbulence model,and the influence of the elevation of the inlet and outlet floor and the forebay shape on the hydraulic characteristics such as flow pattern,velocity distribution and flow distribution between channels is studied and analyzed.The numerical simulation results show that properly lowering the elevation of the bottom plate of the inlet and outlet and increasing the submerged depth can increase the thickness of the water body,thus enhancing the regulation ability,limiting the development of the surface vortex on the water surface to the inside of the flow channel,thus weakening the influence of the surface vortex on the internal flow field,optimizing the flow field and flow pattern,and avoiding the influence caused by the suction vortex;optimizing the shape of the forebay outside the inlet and outlet,increasing the turning radius of the forebay's turning section,making the transition of the external boundary smooth,and reducing the constraint and blocking effect of the boundary can significantly improve the flow pattern of the forebay,and the mainstream of the flow field can be automatically adjusted without being blocked,thus ensuring that the flow direction does not deviate greatly,reducing the formation and development of harmful vortex in the forebay to a certain extent,and further reducing the impact on the inside of the inlet and outlet flow channel due to poor flow field in the forebay.It can effectively reduce the uneven coefficient of velocity distribution in each channel,so that the velocity distribution is more uniform,and at the same time,it can improve the balance of flow distribution among channels,so that its related hydraulic characteristics can be controlled within the range of specifications and design requirements.关键词
进出水口/数值模拟/流态/流速分布/流量分配Key words
inlet and outlet/numerical simulation/flow state/distribution of velocity/flow distribution分类
建筑与水利
