Turbulence characteristics of wall jets along strong convex surfaces
Turbulence characteristics of wall jets along strong convex surfaces
复制标题
沿强凸表面的壁射流的湍流特性
DOI：
10.1016/0020-7403(87)90114-7
复制
发表时间：
1987
影响因子：
7.3
通讯作者：
R. Kobayashi
中科院分区：
文献类型：
--
作者：
N. Fujisawa;R. Kobayashi
用实验方法研究了强凸面上二维壁面射流的平均流动和湍流特性。测量了壁面射流的平均速度、雷诺法向应力、雷诺剪应力和耗散的分布，并对雷诺应力方程中的平流、产生和耗散的平衡进行了检验。随着壁面射流的发展，强凸壁射流的射流扩展和雷诺应力水平显着增加。这些趋势与由半宽与曲面曲率之比表示的曲率参数很好地关联。与平面壁射流相比，强凸壁射流雷诺应力方程中的项的幅值显著增大。特别是，这些似乎是产生垂直于地面的湍流脉动的强烈离心力效应。这一结果，加上切应力的产生和流向湍流脉动的平流，增加了平均流和湍流的相互作用。
Mean flow and turbulence characteristics of two-dimensional wall jets along strong convex surfaces are investigated in an experimental manner. Distributions of mean velocities, Reynolds normal and shear stresses and dissipation across the wall jets are measured, then the balances of advection, production and dissipation in the Reynolds stress equations are examined. The jet spreading and the levels of the Reynolds stresses of the strong convex wall jets increase significantly as the wall jets develop along the surfaces. These trends are well correlated with a curvature parameter represented by the ratio of half-width to surface curvature. The magnitudes of the terms in the Reynolds stress equations for the strong convex wall jet are increased significantly compared with those of the plane wall jet. In particular, these appear to be strong centrifugal effects on the production of the turbulent fluctuation normal to the surface. This production, coupled with the production of the shear stress and the advection of streamwise turbulent fluctuation, increase the interactions of mean flow and turbulence.