论文部分内容阅读
竖井式进出水口是抽水蓄能电站采用的一种型式,但在抽水工况下出水口底板附近出现的反向流速对水头损失和结构物安全影响目前仍是一个亟待解决的难点。基于三维k-ε双方程紊流模型,采用数值模拟技术对其进行了研究,分析了水平方向扩散程度、垂直方向扩散程度(孔口高度)及进水口流速(抽水流量)三种因素对反向流速的影响,结果表明:水平方向的扩散程度越大,在出水口拦污栅处出现的反向流速的高度和流速值也越大,且在竖井扩散段内的分离范围也越大;降低盖板高度可以改善出水口拦污栅处的流速分布情况;进水口流速较大时,在出水口拦污栅底部的反向流速区较低。
Shaft inlet and outlet is a type of pumped storage power station. However, the reverse flow velocity near the outlet of pumping station on the head loss and structural safety is still an urgent problem to be solved. Based on the three-dimensional k-ε two-equation turbulence model, numerical simulation was used to study the effects of horizontal diffusion, vertical diffusion (orifice height) and water inlet velocity The results show that the larger the horizontal diffusion, the higher the velocity and velocity of the reverse flow velocity appeared at the trash rack at the outlet and the larger the separation range in the shaft diffusion section. Lowering the height of the cover can improve the distribution of flow velocity at the trash rack of the water outlet. When the flow velocity of the water inlet is large, the reverse flow velocity area at the bottom of the trash rack at the water outlet is low.