正方形柱まわりのキャビテーション流れ特性(流体工学,流体機械)

概要

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The characteristics of cavity flow around a square cylinder were experimentally investigated for various angles of attack (α=0°-45°) and cavitation numbers (σ_v=0.9〜3.9). Measurements of fluid dynamic forces and surface pressure were made and the cavity configuration was recorded with a high-speed video camera. It was clarified that variations of the flow pattern with cavity development depend on the behavior of the separated shear layer. In a perfectly separated flow region (α≤12.5°), fluctuating fluid dynamic forces increase in a specific range of cavitation number. On the other hand, in the reattached region (15°≤α<45°), the fluctuations reduce monotonically as the cavitation number decreases. At angles of attack α=10° and 12.5° near the reattached flow region, marked increases of the fluctuating forces are caused by the drastic change in the wake structure.
1997-01-25