312 ヒービング運動する弾性平板翼後流の渦流れ(2)(OS3-3 噴流,後流,せん断流の構造・普遍的特性(後流3・噴流1),OS3噴流,後流,せん断流の構造・普遍的特性)

概要

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A number of studies on unsteady flow at low Reynolds number regions have been performed in recent years since the Micro-Electro-Mechanical-Systems (MEMS) is developed with the aim of flow control and micro flight robot. The flow field above has also attracted significant attentions in bio-hydrodynamics due to the need to understand the propulsion mechanisms of aquatic animals, birds and insects. In this study, we have measured detailed vortex flow structures behind a elastic flat plate airfoil undergoing heaving motion at low Reynolds number regions by PIV measurement. We have clarified the vortex flow patterns, vorticity contours and jet velocity behind the elastic flat plate. Moreover, the detailed vortex flow structures behind the heaving elastic flat plate were compared with those of heaving flat plate and heaving NACA0010. The thrust producing vortex street was formed easily behind the elastic flat plate undergoing heaving motion. The jet velocity behind heaving elastic flat plate increases as Strouhal number increases. In particular, jet flow becomes over 3.0 at St=0.43 and the values are greater than those of the heaving NACA0010.
2007-11-17