泄水建筑物水流掺气复氧数值模拟

为了深入地认识泄水建筑物掺气水流的复氧过程,该文应用水气两相流混合模型计算了包括水垫塘在内的泄水建筑物水体的掺气浓度、流速、紊动粘性系数等特征参数。应用气泡界面传质理论建立了掺气水流的溶解氧对流扩散方程。不同试验工况的结果验证了掺气复氧数学模型的合理性和可靠性,表明该模型符合坝身泄流的特点,充分体现了过坝水流对大气的卷吸与紊动混掺。

Numerical simulation of air-entrainment for re-aeration of flow through a sluicing structure

A mixture model for air-water two phase flows was used to predict the air concentration,velocities and turbulent viscosity distributions of flow through a sluicing structure including a stilling basin to study the re-aeration of air-entrained flow.The convection of dissolved oxygen in the air-entrained flow included analysis of the mass transfer across the bubble-water interface.The numerical results for the air-entrained flow agree well with experimental data for various conditions.The results show that the re-aeration model can accurately simulate the flow characteristics through the sluicing structures,especially the rapid air entrainment into the flow.