水平旋转空腔环流的壁面应力

通过对典型的水平旋转内消能泄洪洞空腔环流的试验观测，研究了其壁面应力的变化规律。空腔环流的壁面压强在水平洞的起始段壁面压强急剧减小然后回升，具有过渡段的性质，沿程波状减小，符合对数变化规律，但不同的流态，对数律的参数的变化是不同的：内界面相对压强Po/Pwz。在淹沿流流态时，随(H-h)/h的变化率显著不同，在吸允流流态时却基本相同；壁面切应力沿z的变化规律为先急剧减小，随后缓慢减小至零，主要与环流特性有密切的关系。

Wall Stress of Horizontal Rotary Cavity Flow

The variation rule of wall stress of horizontal rotary cavity flow in an intemal energy dissipating tunnel is researched based on the experimental observation. In the initiative part of tunnel, the wall pressure stress drops rapidly and recovers after reaching the minimum, known as a transition state, and along tunnel, the wall pressure tends to reduce in a wave manner, and can be described by a law of logarithm with different parameters for the corresponding flow patterns. The relative pressure on internal boundary to wall pressure of free flow pattern, p 0/p wz , increases in submerged flow pattern with (H-h)/h and reduces in absorbing one. The variation ratio of p 0/p wz to (H-h)/h is obviously different in submerged flow pattern, when the relative position of z/D changes, but that almost keeps unchanged in submerged one. The wall shear stress drops rapidly in initiative part of tunnel and then decreases gradually along the tunnel following a close relation with the characteristics of rotary cavity flow.