AM06-11-017 超音速ノズル角部流れの縦渦に関する数値的研究(境界層とせん断流・遷移(4),一般講演)

概要

論文の詳細を見る
This numerical study examines the supersonic rectangular-nozzle flow by focusing attention on the development of secondary flow and comer-flow and their effects on the boundary layer instability and transition. The results show that secondary flows appear in the side wall boundary layers and form into streamwise vortices in the corner region immediately behind the throat station where the boundary layer momentum thickness Reynolds number is 400. The streamwise vortex increases in number downstream and induces a local normal-to-wall flow as large as 4% of the local mainstream. The present simulation is in good agreement with the corresponding experiment, in particular, on the appearance of cross-flow instability on the side wall boundary layer and the streamwise location where the streamwise vortex first appears. The corner-flow is found to be of extremely unstable nature suggesting that the turbulent transition observed is directly caused by the corner-flow disturbances.
日本流体力学会の論文
2006-09-05