馬てい渦の乱流遷移過程の研究 (<小特集>画像処理応用熱流体計測)
1999 年 65 巻 629 号 p. 28-35
詳細
1999 年 65 巻 629 号 p. 28-35
The present study quantitatively analyzes changes of flow patterns occurring in unsteady horse shoe vortex systems, using a flow visualization and spectral analysis for fluctuations of velocity, u', measured by PIV. Experiments were performed for flows around an obstacle mounted on a fiat plate in a water channel. In the spectral analysis, the auto correlation, the power spectrum and the cross correlation were investigated for the velocity data measured at the core of vortices. The flow visualization employed was devised so as to be able to made the images of unsteady flows. As a result, the flow patterns in the transient process were characterized quantitatively, where the changes of flow patterns were classified by both of the flow visualization and the spectral analyses.
