321 フラッタを用いた噴流加振に関する研究(2)(OS3-5 噴流,後流,せん断流の構造・普遍的特性(噴流3),OS3噴流,後流,せん断流の構造・普遍的特性)

Abstract

In the present paper, a new type of oscillatory device is proposed. This device is excited by one-degree-of-freedom flutter which does not occur in the uniform flow. As for the characteristics of oscillation, the dependence of pitching amplitude and Strouhal number(St) was measured vs. Reynolds number(Re) on L/c. As for the characteristics of mixing, the time-averaged velocity distributions were measured, and the effect of mixing enhancement was evaluated from the extension of the half-velocity width and the decay of maximum mean velocity. Oscillation characteristics shows that St was almost constant in Re>1.0×10^5. Pitching amplitude was constant when flow velocity is the critical flutter speed. Mixing characteristics shows, the half-velocity width and the decay of maximum mean velocity were found to be greater for the oscillating flat plate than for the without flat plate.