斜鼻坎挑流消能水力特性试验研究

Experimental Study on the Flip Trajectory Bucket Lip Ski- jump Energy Dissipation in the Spillway

特殊地形地质条件下,高水头泄水建筑物连续式挑流鼻坎出射水流水股集中,下游所形成的冲坑可能威胁到河岸山体稳定性及相邻建筑物的安全。在不过多改变原设计体型的情况下,将连续式鼻坎优化为斜鼻坎,迫使出坎水舌在平面上转向沿竖向大幅拉开,既能够使水流平顺归河,也能有效降低水股对落点的冲刷。试验研究表明,异型斜鼻坎反弧范围的水流流速和压力分布,较之连续式鼻坎未见明显变化,采用斜鼻坎挑流消能,发现较之连续式鼻坎挑流消能并不必然增加空蚀破坏可能性。

The special geological conditions of high water head,discharge structure of continuous bucket exit flow water stock concentration,the formation of the scour downstream could threaten the stability of riparian mountain and adjacent buildings safety. But many changes to the original design shape under the condition of continuous bucket,the optimization for the oblique bucket,forced out of the pit water tongue in the plane steering along the vertical has widened,both to ride to the river flow,can effectively reduce the scouring water on the impact of stock. Experimental research shows that special shaped cable bucket anti arc range of flow velocity and pressure distribution,obvious than continuous bucket no change,using inclined bucket flow energy dissipation,does not necessarily increase the possibility of cavitation damage.