大迎角を持つ軸対称放物体背後に生じる剥離渦の可視化と熱線データ解析(流体工学,流体機械)

概要

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Three-dimensional separation of the flow over a slender body at high angles of attack is difficult to model and still a challenging problem. The singularity of the flow, such as large sideforces and yawing moments, is caused by mutual interactions of three-dimensional separation and separated vortices. In this study, the flow in the cross-flow separation region of an axisymmetric paraboloid at 40 and 50 deg angles of attack has been investigated experimentally by smoke visualization technique and hot wire anemometer. Reynolds numbers are 9.0×10^3 and 1.8×10^4 referred to the base diameter. The process of the change from symmetric to asymmetric vortices and vortex breakdown has been identified on the basis of the visualization results. It was suggested that the relations between separated vortex and the other flow regions, such as primary separated flow region, reattachment flow region and external flow region, are estimated calculating two-points velocity cross-orrelation in various cross-sections.
社団法人日本機械学会の論文
2002-04-25