曲率对边界层湍流结构的影响

Effect of Curvature on the Structure of Turbulent Boundary Layers

本文计算了沿不同曲面流动的湍流边界层。提出了考虑曲率影响的双方程湍流模式。通过与实测的穿过边界层的湍流能量和结构系数分布的数据比较,分析了曲率对边界层的影响。结果发现,曲率对边界层湍流结构的影响小于旋转的影响,但在不旋转的蜗壳中,不能略去曲率的影响。

Turbulent boundary layers along two surface of curvature were investigated with computation. A two equation turbulence model was employed to include the influence of curvature on turbulent kinetic energy. Curvature terms were evaluated by comparisons on two surface of curvature with measured distribution of turbulence energy across the boundary layer and effect of curvature on structural coefficient. The curvature modification of turbulence was found less influencetial than the rotation modification, but it can not be ignored in the volute of centrifugal pump.