NACA0012翼型より生じる離散周波数音に及ぼす二次元ラフネスの影響 Effects of a 2-D Roughness on Tonal Noise Generated by an NACA0012 Airfoil
The present paper experimentally investigated boundary-layer transition related with Trailing-Edge Noise (TE noise) emanated from a 2-D NACA0012 airfoil with and without a 2-D thin-tape roughness, which was placed in an anechoic wind tunnel. Surface pressure fluctuation and acoustic measurements showed that the roughness width was sensitive to TE noise generation and magnified the tonal noise when its width corresponded to one and half wavelengths of instability wave in transitional boundary layer. Furthermore, the roughness position had remarkable effects on TE noise generation.
- 日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences
日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences 55(646), 527-532, 2007-11-05