波状流路内乱流の計測

抄録

Measurements of a turbulent flow in a wavy channel of high aspect ratio, one wall being sinusoidal and the other flat, are described in this report. Attention is focused on the flow in the near field of the flat wall. Mean flow and major statistical quantities of turbulence such as turbulence intensity. Reynolds stresses and skewness factors are included. The near-wall region was influenced largely by periodical pressure variation and the viscous sublayer was thickened. In the mean time, the core region was little affected and the velocity defect law was little modified. As for the turbulence property, it was revealed that acceleration of flow vitalized the turbulence in the layer very close to the wall and deceleration attenuated it. These disturbances were reflected quickly in the turbulence intensity and turbulent energy production, but slowly in the shear stress. However, it turned out that the effect of the pressure gradient on the turbulence behavior could be explained in terms of flow structure.