期刊
JOURNAL OF FLUID MECHANICS
卷 849, 期 -, 页码 927-941出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2018.449
关键词
turbulent boundary layers; turbulent flows
资金
- United States Office of Naval Research (ONR) under ONR Grant [N00014-14-1-0289]
Axisymmetric boundary layers are studied using integral analysis of the governing equations for axial flow over a circular cylinder. The analysis includes the effect of pressure gradient and focuses on the effect of transverse curvature on boundary layer parameters such as shape factor (H) and skin-friction coefficient (C-f), defined as H = delta*/theta and C-f = tau(w)/(0.5 rho U-e(2)) respectively, where delta* is displacement thickness, theta is momentum thickness, tau(w) is the shear stress at the wall, rho is density and U-e is the streamwise velocity at the edge of the boundary layer. Relations are obtained relating the mean wall-normal velocity at the edge of the boundary layer (V-e) and C-f to the boundary layer and pressure gradient parameters. The analytical relations reduce to established results for planar boundary layers in the limit of infinite radius of curvature. The relations are used to obtain C-f which shows good agreement with the data reported in the literature. The analytical results are used to discuss different flow regimes of axisymmetric boundary layers in the presence of pressure gradients.
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