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在水库开闸泻水过程中,高速水流掺气以及消能过程中水流的强烈碰撞会卷吸大量气体形成溶解气体过饱和现象,进而引起鱼类患气泡病死亡。此文引入气体向气泡界面和水体表面传质的机理,利用坐标变换对自由水表面边界进行特殊处理,在三维紊流两相流模型的基础上模拟气泡在水中的运动和溶解,从而计算过饱和气体的浓度分布,并将此模型运用在对葛洲坝饱和气体模拟预测中,还和实测值进行了比较。结果表明:运用坐标变换方法后的模型能更准确地模拟饱和气体浓度。
During the process of open sluicing of reservoirs, the high-speed water flow entrained and the strong collision of water flow in the process of energy dissipation can entrain a large amount of gas to form a dissolved gas supersaturation, which in turn causes the death of fish suffering from air bubble disease. In this paper, the mechanism of gas mass transfer to bubble interface and water surface is introduced, and the surface of free water is treated by coordinate transformation. Based on the three-dimensional turbulent two-phase flow model, the movement and dissolution of bubbles in water are calculated Saturated gas concentration distribution, and the model used in the Gezhouba saturated gas simulation prediction, but also with the measured values were compared. The results show that the model after the coordinate transformation method can simulate the saturated gas concentration more accurately.