Turbulent wall jets with cylindrical streamwise surface curvature
Turbulent wall jets with cylindrical streamwise surface curvature
复制标题
具有圆柱形流向表面曲率的湍流壁射流
DOI：
10.1115/1.3448393
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发表时间：
1976
影响因子：
2
通讯作者：
R. J. Goldstein
中科院分区：
文献类型：
--
作者：
D. Wilson;R. J. Goldstein
通过直接比较沿圆柱凸面流动的壁面射流及其平面流动当量，研究了壁面曲率对二维壁面射流发展的影响。离心力不稳定性引入了弯曲壁射流与周围环境的快速混合，并导致射流湍流强度和雷诺剪切应力的显著增加。观察到弯曲射流中湍流速度场的自我保存有很大的偏离，而流向平均速度剖面在下游发展中保持了相似的形状。将曲率对涡流粘度影响的模型与实验测量值进行了比较，表明曲率影响的简单修正是可能的。
The effect of surface curvature on the development of a two-dimensional wall jet is investigated experimentally by direct comparison between a wall jet flowing around the convex surface of a circular cylinder, and its plane flow equivalent. Centrifugal force instabilities introduce rapid mixing of the curved wall jet with its surroundings, and cause significant increases in turbulence intensity and Reynolds shear stress in the jet. Large departures from self-preservation of the turbulence velocity field in the curved jet are observed, while the streamwise mean velocity profiles retain similar shapes for downstream development. Models for curvature effects on eddy viscosity are compared with experimentally measured values, and indicate that a simple correction for the effects of curvature is possible.