抽水蓄能电站同发同抽工况下漩涡特性的研究

Study on Vortex Characteristics of Pumped Storage Power Station under Simultaneous Generation and Pumping Conditions

为探究抽水蓄能电站同发同抽工况的可行性,对某抽水蓄能电站进行物理模型试验研究发现,当电站最低淹没深度满足Gordon公式的要求时,在同发同抽工况下侧向进水口前观测到尺度和强度较大的立轴漩涡。通过分析对比单个水力单元单向发电工况与同发同抽工况的库区流态,得出在同发同抽工况下,抽水侧水体形成的沿岸回流与发电侧表面横流相互挤压后汇聚,对涡核区域水体施加附加剪切力,从而导致回流流速持续增大,产生吸气漩涡。针对产生漩涡的水动力学条件,提出抬高死水位和在进/出水口上方平台加设隔墙两种方案,达到消除同发同抽工况下的吸气漩涡的目的。研究成果可为抽水蓄能电站同发同抽工况研究提供参考。

In order to explore the feasibility of the same pumping condition of the pumped storage power station, a physical model test of a pumped storage power station was carried out. During the test, it was found that when the minimum submerged depth of the power station meets the requirements of the Gordon formula, a vertical axis vortex with a large scale and strength is observed before the lateral inlet in the same pumping condition. By analyzing and comparing the one-way power generation condition of a single hydraulic unit with the flow state of the same area with the same pumping condition, it is concluded that the coastal return flow formed by the pumping side water body and the lateral flow of the power generation side are mutually squeezed under the same pumping conditions. After the convergence, an additional shear force is applied to the water body in the vortex core region, resulting in a continuous increase in the reflux flow rate, producing an inhalation vortex. In view of the hydrodynamic conditions for generating vortices, two schemes of raising the dead water level and adding a partition wall to the platform above the inlet/outlet are proposed to eliminate the inhalation vortex under the same pumping condition. The research results can provide reference for the study of the same pumping conditions of pumped storage power stations.