長方形タブ付き平面噴流の流れ特性

抄録

The present paper describes the results of the passive flow control of a plane jet by rectangular tabs at relatively low Reynolds numbers (Re = 2000). The effect of width of rectangular tabs at the nozzle exit on the flow characteristics and vortical structures of a plane jet are 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. Good agreement was found between the experimental and numerical simulation velocity profiles when large eddy simulation (LES) was employed in near field region. We found that a plane jet with small width tab had the smallest jet spread downstream, and the jet’s centerline velocity was larger than that with large width tab. The preservation of streamwise vortices in the downstream relates to the location and intensity of the four streamwise vortices behind a rectangular tab.