An experimental investigation of turbulent boundary layers along curved surfaces
An experimental investigation of turbulent boundary layers along curved surfaces
复制标题
沿曲面湍流边界层的实验研究
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
G. Mellor
中科院分区：
文献类型：
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作者：
R. So;G. Mellor
设计了一个曲壁风洞，在弯曲试验段前的直管段上设置了一个平衡湍流边界层。研究了沿沿着凸、凹壁面均匀分布和逆压力分布的湍流边界层流动。沿着凸面的热线测量表明，流体层之间的湍流混合大大减少。然而，法律的墙壁举行和表面摩擦力，从而确定，以及与其他测量。沿凹形试验壁沿着的热线测量揭示了边界层内的纵向涡流系统，并证实凹形曲率增强了混合。推导了适用于沿着曲面流动的自洽湍流边界层方程组，并引入了修正的涡粘性系数。这些方程的解以及修改的涡流粘性给出的结果与当前关于具有任意压力分布的沿着凸面流动的数据非常相关。但由于边界层内纵向涡系的存在，它只能用来预测沿沿着凹壁流动的平均特性。
A curved wall tunnel was designed, and an equilibrium turbulent boundary layer was set up on the straight section preceding the curved test section. Turbulent boundary layer flows with uniform and adverse pressure distributions along convex and concave walls were investigated. Hot-wire measurements along the convex surface indicated that turbulent mixing between fluid layers was very much reduced. However, the law of the wall held and the skin friction, thus determined, correlated well with other measurements. Hot-wire measurements along the concave test wall revealed a system of longitudinal vortices inside the boundary layer and confirmed that concave curvature enhances mixing. A self-consistent set of turbulent boundary layer equations for flows along curved surfaces was derived together with a modified eddy viscosity. Solution of these equations together with the modified eddy viscosity gave results that correlated well with the present data on flows along the convex surface with arbitrary pressure distribution. However, it could only be used to predict the mean characteristics of the flow along concave walls because of the existence of the system of longitudinal vortices inside the boundary layer.