矩形明渠自由水跃区紊流边界层的发展  

Development of Turbulent Boundary Layer in Free Hydraulic Jump Area of Rectangular Open Channel

作　　者：张志昌[1] 李若冰[1] 赵莹[1] 傅铭焕[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《西安理工大学学报》2013年第3期325-329,共5页Journal of Xi'an University of Technology

摘　　要：通过分析前人对溢流面边界层和矩形明渠自由水跃区流速分布的研究成果,提出水跃区紊流边界层发展的计算方法。根据Rajaratnam对附壁射流、水跃区最大流速分布和壁面切应力公式的试验成果,采用紊流边界层的动量积分方程,根据流速分布的对数律,研究了水跃区紊流边界层的发展。得出了水跃区紊流边界层发展的计算公式,通过与Rajaratnam的实测结果对比,验证了公式的正确性。首次提出了自由水跃区紊流边界层发展的理论计算方法,用该方法可以计算水跃区的壁面切应力和沿程阻力系数。Through the analysis of research results of predecessors about boundary layer in spillway sur- face and velocity distribution in free hydraulic jump area of rectangular open channel, the calculation method of turbulent boundary layer development in hydraulic jump area is presented. According to Ra- jaratnam＇ s test results of adhesive wall jet flow, the maximum velocity distribution of hydraulic jump area and the formula of wall shear stress, adopting the momentum integral equation of turbulent boundary lay- er, the development of turbulent boundary layer in hydraulic jump area is researched based on the log- arithm law of velocity distribution. The calculation formula of turbulent boundary layer development in hy- draulic jump area is obtained while the validity of equation is verified through comparing Rajaratnam＇ s test results. The theoretical calculation method of turbulent boundary layer development in free hydraulic jump area that can calculate wall shear stress and Resistance coefficient is put forwarded for the first time.

关 键 词：自由水跃 紊流边界层 动量积分方程 对数律 

分 类 号：TV131.21[水利工程—水力学及河流动力学]