210 可動渦発生器による縦渦と干渉する馬蹄形渦に関する研究(2)(OS2-3 壁乱流の計測と制御,OS2壁乱流の計測と制御)

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The periodic behavior of the horseshoe vortex interacting with a pair of longitudinal vortices by Active Vortex Generators (AVG) was discussed in the paper. The horseshoe vortex was generated at the base of NACA0024 and the longitudinal vortices were produced by AVG with the controlled yaw angle. The velocity was measured by using a rotary x-array hot-wire anemometer with a stepping motor. The objective is to clarify experimentally the phase-averaged characteristics of the velocity and the vorticity in the interference field between horseshoe vortex and longitudinal vortices. The Reynolds number Re_θ based on the momentum thickness was 1670. It was found that the horseshoe vortex was shifted by longitudinal vortex pair. The longitudinal vortices in Common Flow Up Case make the horseshoe vortex move forward the corner of the wing and has the effect of attenuate as to the vorticity in the downstream. In Common Flow Down Case, they merge into one vortex and their vorticity is decreased.
2007-11-17