兼使水流转向的非对称窄缝挑坎

Asymmetric slit buckets with function of changing flow direction

讨论了兼有水流转向功能的一级非对称直线边壁窄缝的设计方法与水力特性 ,两边墙转向角之差即为水流转向角 ,两边墙转角相等时出口水流的水深和佛汝德数也分别相等 .按在窄缝出口前形成完整幅射流的条件 ,讨论了兼有转向功能的非对称曲线边墙窄缝的设计方法与水力特性 .比较了六种体型 (三种对称、三种非对称 )窄缝在八种工况对泄槽底板的冲击压强 ,实测结果表明 。

The hydraulic characteristics of asymmetric slit bucket having linear side walls with function of changing flow direction is studied. It is found that the deflection angle of the out going flow is equal to the difference of the deflection angles of side walls and the flow depth and Froude number at the exit of the bucket will not change if the sum of the deflection angles keeps the same. The design principle of this kind of bucket is proposed. The impact force of the nappe acting on downstream riverbed measured in model test shows the asymmetric bucket is better than the symmetric one.