溢流坝反弧段压力分布规律的探讨

本文通过典型溢流坝不同反弧半径模型的水力量测,在一定理论分析的基础上提出了综合反映反弧段流速、水深、重力,特别是反弧曲率半径对离心力压强影响的无因次参数。并根据该参数的变化规律,提出了溢流坝反弧段离心力压强系数具有过渡段的性质,这一性质也得到其它试验资料的验证和说明。本文还在此基础上给出了溢流坝反弧段压强及其梯度的表达式。

The Study of the Pressure Distribution in Bucket of a Spillway

The hydraulic measurements are made in the bucket of a model spillway with the va rious surface curvatures. A coefficient of the centrifugal pressure is suggested according to the theoretical analysis. The different datum of experimental centrifugal pressures can be centralized on the same curve and the relations between the centrifugal pressure and other hydraulic parameters, especially the radius of surface curvatures in the bucket are successfully revealed. The C_(PC) can also be simply formulated by experimental information Thus, the centrifugal pressure in the bucket of a spillway is first formulated completly with the C. The correction of these formulas is proved by the measurements. The transitional quality of the centrifugal pressure may be showed from the behaviour of the C_(PC), which in fact, is the result of the change of flow line curvatures. The different regions of the pressure of the bucket can be divided according to the transitional quality