旋流阻塞与旋流扩散复合内消能泄洪洞的壁面压强特性

结合雅砻江两河口水电站3#导流洞改建的水工模型试验,研究了新型旋流阻塞和旋流扩散复合内消能泄洪洞的壁面压强特性。研究结果表明:在淹没堰流流态时,壁面压强在进口的堰面、竖井段和旋流洞段因阻塞的顶托作用整体增大;在起旋器出口下游侧的旋流洞的顶部仍然存在局部范围的低压区或负压区;在旋流阻塞段,流速增大,壁面压强减小,水流空化数降低;在旋流扩散段,壁面压强略大于或小于大气压。

Wall pressure characteristics of the inner energy dissipation tunnel with the spiral flow barrage and diffusion

Based on the model test of the 3~# diversion tunnel's reconstruction of Yalongjiang-Lianghekou hydropower station,the wall pressure characteristics of a new type of tunnel are investigated,in which the spiral flow barrage and the spiral flow diffusion are combined to increase the energy dissipation .The research illustrates under the conditions of the submerged weir flow that the pressure on the wall of the shaft,the spiral starter and the tunnel,will increase totally due to the barrage effect,and a tiny area of low or negative pressure exists at the top of tunnel,abutting on the downstream of spiral starter orifice.In the part of the spiral flow barrage,the pressure decreases,the velocity increases and the water flow cavitation number reduces.In the part of the spiral flow diffusion,the pressure is slightly more or less than the atmospheric pressure.