平板湍流边界层整体摩擦阻力的振荡性

The Fluctuation of the Total Skin Friction of a Flat Plate in Turbulent Boundary Layer

本文分别用流场显示和阻力测量两种实验方法,证明了平板整体摩擦阻力存在着振荡性,并得到了其振荡的一些规律和特点。另外,提出了一个与时间相关联的内层速度分布模型。并对其合理性进行了研究,从而导出一个与时间相关联的整体摩擦阻力模型。

In this paper,it was proved by flow visualization and drag measurement that the total skin friction of the flat-plate is fluctuating,and some rules and features of the fluctuation were ob- tained.Theoretical analysis was conducted for the fluctuation by advancing a new law which is con- netted with time about the distribution of the inner layer velocity in turbulent boundary layer.In addi- tion,the reasonableness of the law was analysed and a formula of total skin friction associated with time was obtained.