A210 垂直浮力噴流の組織構造の可視化と同時速度計測

Abstract

In order to understand the turbulent structure of the buoyant plume, the simultaneous flow visualization and the velocity measurements by PIV are carried out in vertical and horizontal planes of the plumes. The flow visualization result shows the periodic formation of mushroom type vortices in the plume, which is induced by the ejection of the hot fluid from the nozzle exit by the influence of buoyancy. It is found from the PIV measurement that the ejection velocity reaches more than 3 times of the plume velocity at the nozzle exit and entrains the cold fluid into the plume, which contributes the large growth rate of the plume development.