【摘要】 光滑圆管进口段紊流边界层的研究在理论和实践上都具有十分重要的意义。本文在流速分布符合对数律和指数律的假设下,通过求解卡门边界层动量积分方程获得了光滑圆管进口段紊流边界层发展的计算式,并建议了光滑圆管紊流边界层发展区的平均流速计算式。同时对指数n与参数(u_*δ)/v的关系也进行了探讨。更多还原

【Abstract】 The study of the turbulent boundary layer along a smooth pipe at zero incidence is of great significance both in practice and in theory. In this paper, the formulas for calculating the boundary layer thickness are obtained by solving Karman’s momentum integral equation of boundary layer in which the assumptions of the logarithmic law and 1/n-th-power law for velocity distribution are adopted. A method for calculating the mean velocity of flow through a pipe in the region of developing turbulent boundary layer is suggested. The relationship between the parameter n and u δ/v is studied.更多还原