スリットノズル出口にタブを設置した噴流の流れ構造に関する研究

抄録

The effects of tabs at the flow characteristics of a plane jet at low Reynolds number was investigated. The flow visualization and velocity measurements were carried out using particle image velocimetry (PIV). In addition, three-dimensional plane jet numerical simulations were performed using ANSYS Fluent to investigate the vorticity and the vortical structures. We found that a plane jet with square tabs had the smallest jet spread downstream, and the jet's centerline velocity was larger than those of jets perturbed by the other tabs at Re = 2,000. It was also observed that the spanwise vortical structure of a plane jet disappeared completely if square tabs or delta tabs were attached. Good agreement was found between the experimental and numerical simulation velocity profiles when large eddy simulation (LES) with Dynamic Smagorinsky-Lilly (DSL) model was employed. The development of streamwise vortices in the shear layers that were produced behind the square or delta tabs could prevent the jet from spreading.