密排加糙床面消力池水跃旋滚长度的计算

The calculation of roller length on uniform rough height beds of stilling basin

为了计算水跃旋滚长度这一重要特征尺度,本文通过追踪水跃区水体质点的运动方程,研究了密排加糙床面消力池水跃旋滚长度的变化规律。结果表明:水跃旋滚长度与跃高相关;相对加速度并不是一个常数,而是与跃前断面弗劳德数、跃前和跃后断面平均水深、床面粗糙高度相关的函数。最后通过与已有密排加糙床面实验工况的结果进行对比,验证了本文旋滚长度公式的正确性和通用性。

In order to calculate the length of roller,an important feature scale of hydraulic jump,the present paper investigates the variation of roller length occurred on uniform rough height beds of stilling basin with the aid of building motion equations of flow.It is revealed that the roller length is related to the high jump.The relative acceleration is not a constant,which is a function of the upstream Froude number,the upstream supercritical flow depth,the sequent depth and the rough height of the bed.Finally,the calculation results are validated via the comparison with those tested from the corrugated beds.