波状床面消力池共轭水深和水跃长度的计算  

Calculation of conjugate depths and length of jump on corrugated beds of stilling basin

作　　者：张志昌[1] 傅铭焕[1] 李若冰[1] 

机构地区：[1]西安理工大学,西安710048

出　　处：《水力发电学报》2014年第5期120-127,共8页Journal of Hydroelectric Engineering

基　　金：陕西省普通高校重点学科建设项目资助(106-00X902)

摘　　要：根据Ead和Rajaratnam对波状床面消力池水跃特性的试验成果,以及笔者得出的波状床面消力池流速分布的研究成果,通过边界层理论研究波状床面消力池边界层的发展、壁面切应力和壁面阻力的变化规律,通过动量方程研究波状床面消力池的共轭水深和水跃长度的计算方法,给出了波状床面壁面切应力、壁面阻力、水跃共轭水深和水跃长度的计算公式,与Ead和Rajaratnam的试验成果进行对比,验证了公式的正确性。研究表明:波状床面消力池的壁面切应力和壁面阻力与壁面粗糙度、跃前断面流速以及水跃长度有关;水跃共轭水深的计算必须考虑壁面阻力的影响;水跃长度是跃后水深和粗糙度的函数。Based on the test results of Ead and Rajaratnam and the velocity distribution of corrugated beds derived by the present authors, boundary layer theory is applied to an analysis on development of boundary thickness and variations in wall shear stress and integrated bed shear stress, and the conjugate depths and length of jump are calculated using the momentum equation. We have derived calculation formulas for all these quantities and verified them with the test results. It is shown that the wall shear stress and integrated bed shear stress depend on roughness height, initial velocity, and length of jump, and that the roughness height is an obligatory parameter for calculation of conjugate depths. And the length of jump is a function of subcritical depth of jump and roughness height.

关 键 词：水力学 波状床面消力池 边界层理论 壁面阻力 共轭水深 水跃长度 

分 类 号：TV135.21[水利工程—水力学及河流动力学]