竖井壁面掺气坎布设位置的数值模拟研究 Numerical Simulation on the Position of the Aeration Step of a Shaft

Abstract

实验表明，采用竖井直段壁面掺气坎的方式对旋流竖井进行掺气保护是可行的。本文对不同位置壁面掺气坎进行数值模拟计算，并对比分析了各种情况下的水流流态、壁面压强和掺气空腔长度。结果表明：在不同位置布设壁面掺气坎对竖井内部水流流态和壁面压强影响不大；布设对称掺气坎时始终有一侧难以形成明显空腔，在进口来流方向近入口断面一侧壁面逆时针旋转90˚的位置布设一道掺气坎时，空腔长度最长并且全程均可形成稳定贯通的空腔。 Experiments show that it is feasible to carry out aerosol protection on the vortex shaft by the way of the aeration step of the shaft. In this paper, numerical simulation is carried out on the different positions of the aeration step, and the flow regime, wall pressure and aeration cavity length in each case are analyzed and compared. The results show that there are few effects on the flow and wall pressure of the shaft in different locations. It is difficult to form a clear cavity on the side of the symmetrical aeration. At the inlet flow direction, when the clock is rotated by 90˚, the cavity is the longest and the whole can form a stable cavity.