壁面湍流质量注入减阻效应的数值研究

摘要

为解释边界层质量注入减少摩擦阻力机理，采用雷诺平均纳维－斯托克斯方程，基于最近发展的的Wilcox k-ω湍流模式，对二维壁湍流质量注入进行了数值研究。计算得到的局部摩擦阻力系数与试验结果比较，表明该模式在该情况下具有较高的精度。在其他参数保持不变的条件下，分有无质量注入2种情况，确认了质量注入会增加边界层厚度的膨胀效应，促进了边界层内湍流的发展程度，解释了减阻效应。通过速度剖面分布、湍动能及涡粘系数的分布比较，有助于加深人们对该流动现象的认识。%For explaining the mechanism of resistance reducing by mass injection into a boundary layer, using Reyn-olds averaged Navier-Stocks ( RANS) equations a numerical investigation on resistance reducing effect by mass in-jection into two-dimensional wall turbulent flow was conducted based on the Wilcox k-ωturbulence model.Compari-son of the local frictional resistance coefficient's numerical result and the experimental result demonstrated that the turbulence model has high precision.Two cases were studied to confirm that the boundary layer is blowing up by mass injection that consisted of mass injection and no mass injection with the same flow condition.It was concluded that turbulence is more developed with the aid of mass injection and this may explain the resistance reducing quali-tatively.By comparing the velocity profile, the turbulent kinetic energy and turbulent eddy viscosity are useful for gaining a deeper understanding of this complex flow.