窄河道大交角泄洪洞出口体型优化试验研究

某电站深孔泄洪洞下泄流量大,水头高,出口位置处河道狭窄,泄洪洞轴线与河道交角大,且离电站尾水出口近。针对以上特点,本文对深孔泄洪洞出口体型提出斜切扭曲挑坎和窄缝挑坎两个方案,并分别进行了优化试验研究,结果表明:斜切扭曲挑坎方案和窄缝挑坎方案的归槽情况都较好,涌浪最大的地方及冲坑最深点均在山嘴处;斜切扭曲挑坎方案的冲坑较浅,但涌浪高且电站尾水处可能有泥沙进入;窄缝挑坎方案对电站尾水影响小,但冲坑深度较斜切扭曲挑坎方案大。

Research for the Optimization test of outlet of flood discharge tunnel in Narrow Water Course with Large Included Angle

The flood discharge tunnel outlet locating in a narrow water course,has bigger discharge and higher water head,and has large included angle and near to tail water of the hydropower station.This paper optimizes the flip-bucket of the tunnel by experiments,and the result indicates both curvature and slit-type flip-bucket can carry the flow into the downstream river well,and the maximum wave height and the scouring pit of biggest depth occur near the ridge;for the scheme of curvature flip-bucket,the scouring pit is relatively shallower,but the wave height is larger and sediment may be carry into the tail water;slit-type flipbucket has less effect on the tail water,but the scouring pit is deeper than that of curvature flip-bucket.