一様旅中における円柱後旅の三次元構造
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概要
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Using the flow visualization techniques with streamwise view, plan view, whole view and PTV, the three-dimensional structure in cylinder body wakes in uniform flow are investingated. Hydrogen bubbles were used as tracer in flow visualization technique. The structure of streamwise vortices in cylinder body wakes and its transmission characteristics became clear. And the three-dimensional structure, for example spanwise scale and time-space instability of streamwise vortices, changing with Reynolds number are clarified. By PTV, the motions of streamwise vortex changing with the time series are investigated. Furthermore it was shown clearly that bifurcation phenomenon play important role of the structure and the transmission characteristics of streamwise vortices.
- 2003-12-01