Influence of the Side Walls on the Turbulent Center-Plane Boundary-Layer in a Square Duct
Influence of the Side Walls on the Turbulent Center-Plane Boundary-Layer in a Square Duct
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DOI：
10.1115/1.3448621
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发表时间：
1974-05
影响因子：
2
通讯作者：
V. Brederode;P. Bradshaw
中科院分区：
文献类型：
--
作者：
V. Brederode;P. Bradshaw
方形管道入口区（特别是风洞工作段）的测量表明，对于厚度小于管道宽度四分之一的边界层，拐角处应力诱导二次流对中心面边界层的直接影响可以忽略不计。此外，流向压力梯度和准共线横向收敛的影响趋于抵消，使得速度分布和表面摩擦力非常接近平板上的那些。这表明，即使当边界层厚度为风洞高度的四分之一时，在恒定的正方形横截面的风洞底板上的边界层也可以用来模拟平板流动。
Measurements in the entry region of a square duct (specifically, a wind-tunnel working section) show that the direct effect of stress-induced secondary flows in the corners on the center-plane boundary layer is negligible for boundary layers thinner than about one-fourth of the duct width. Further, the effects of streamwise pressure gradient and of quasi-collinear lateral convergence tend to cancel so that the velocity profiles and skin friction are quite close to those on a flat plate. This shows that the boundary layer on the floor of a wind tunnel of constant, square cross section can be used to simulate a flat-plate flow even when the boundary layer thickness is as large as one-fourth of the tunnel height.