Study on gust aero-force on 2-D bluffbody affected bybody mption

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  • 二次元断面のガスト空気力に及ぼす断面振動の影響について

Abstract

The aim of this thesis is to clarify the generation mechanism of gust force due to fluctuating flow. In order to discuss the aerodynamic admittance of pitching moment and to investigate the influence of body motion on gust force, the surface pressure around 2-D model with rectangular section of B/D=5(B:chord length, D:depth of the section) were measured in the artificially generated 3-D and 2-D fluctuating flow. It is observed that the unsteady surface pressure in 2-D sinusoidal flow corresponds well to the pressure under pitching motion in uniform flow, which leads to the close relationship between the Kűssner and the Wagner problems. As for the influence of body motion , the independence of the gust force and the motion –induced force has been confirmed.

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