矩形平底渠道淹没水跃区的水头损失

发布时间：2018-06-10 04:24

本文选题：水力学 + 矩形平底明渠　；参考：《应用力学学报》2017年05期

【摘要】：研究了矩形平底明渠淹没水跃区的水头损失。根据Rajaratnam对淹没水跃区的流速分布、壁面切应力、最大流速的试验成果和Verhoff附壁射流区断面流速分布的计算公式,应用紊流边界层理论研究了淹没水跃区的边界层发展和沿程水头损失的计算方法。根据动量方程和能量方程研究了淹没水跃区的跃前断面水深、总水头损失、局部水头损失、消能率的计算方法。给出了淹没水跃区最大流速、紊流边界层厚度、沿程水头损失、总水头损失、局部水头损失、局部阻力系数、消能率的计算方法。研究表明:淹没水跃区的总水头损失是跃前断面弗劳德数、跃前水深和淹没度的函数,沿程水头损失和局部水头损失与跃前断面流速、水深、水跃长度、跃前断面的特征雷诺数和消力池宽度有关。淹没水跃区的水头损失主要是局部水头损失,消能率随着弗劳德数的增加而增加。
[Abstract]:The head loss of submerged water jump area in rectangular open channel with flat bottom is studied. According to the experimental results of Rajaratnam's velocity distribution, wall shear stress, maximum velocity of velocity in submerged water jump area and the formula of velocity distribution in Verhoff's wall-attached jet zone, Based on the turbulent boundary layer theory, the development of the boundary layer and the calculation method of the head loss along the submerged water jump region are studied. According to momentum equation and energy equation, the calculation methods of water depth, total head loss, local head loss and energy dissipation rate of the jump section in submerged water jump area are studied. The calculation methods of maximum velocity, turbulent boundary layer thickness, head loss, total head loss, local resistance coefficient and energy dissipation rate are given. The results show that the total head loss in submerged water jump area is a function of Froude number of front section, depth and degree of submergence, head loss and local head loss along the course and velocity, depth and length of water jump. The characteristic Reynolds number of the front section is related to the width of the stilling pool. The water head loss in submerged jump area is mainly local head loss, and the energy dissipation rate increases with the increase of Froude number.
【作者单位】：西安理工大学;中国水电建设集团十五工程局有限公司;浙江省水利水电勘测设计院;
【分类号】：TV135.21

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