本文選題：水力學(xué) + 矩形平底明渠��； 參考：《應(yīng)用力學(xué)學(xué)報》2017年05期

【摘要】：研究了矩形平底明渠淹沒水躍區(qū)的水頭損失。根據(jù)Rajaratnam對淹沒水躍區(qū)的流速分布、壁面切應(yīng)力、最大流速的試驗(yàn)成果和Verhoff附壁射流區(qū)斷面流速分布的計算公式,應(yīng)用紊流邊界層理論研究了淹沒水躍區(qū)的邊界層發(fā)展和沿程水頭損失的計算方法。根據(jù)動量方程和能量方程研究了淹沒水躍區(qū)的躍前斷面水深、總水頭損失、局部水頭損失、消能率的計算方法。給出了淹沒水躍區(qū)最大流速、紊流邊界層厚度、沿程水頭損失、總水頭損失、局部水頭損失、局部阻力系數(shù)、消能率的計算方法。研究表明:淹沒水躍區(qū)的總水頭損失是躍前斷面弗勞德數(shù)、躍前水深和淹沒度的函數(shù),沿程水頭損失和局部水頭損失與躍前斷面流速、水深、水躍長度、躍前斷面的特征雷諾數(shù)和消力池寬度有關(guān)。淹沒水躍區(qū)的水頭損失主要是局部水頭損失,消能率隨著弗勞德數(shù)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.
【作者單位】： 西安理工大學(xué);中國水電建設(shè)集團(tuán)十五工程局有限公司;浙江省水利水電勘測設(shè)計院;
【分類號】：TV135.21

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本文編號：2001966