薄い境界層中に設置された円錐体周りの流れ : 中心断面内の流れ場(流体工学,流体機械)

抄録

LDV measurement and flow visualization have been made in order to investigate the behavior of horseshoe vortex and flow separation around a cone mounted on a plate. The apex angle 2α of cone is less than or equal to 90° and the height is 50mm. The Reynolds number based on the height is 1100, and the relative boundary layer thickness is 0.41. The streamwise positions of boundary layer separation and primary horseshoe vortex measured from the upstream bottom edge of the cone are proportional to the height of the front stagnation point. The strength of the spanwise mean vorticity of the primary horseshoe vortex depends on the boundary layer mean vorticity distribution. The reverse region formed behind the cone enlarges with the bottom diameter. The configuration of the reverse region depends on both the Reynolds number based on the velocity scale of the pressure acting on the upstream surface of the cone and the strength of spanwise additional strain rate induced by the primary horseshoe vortex.