Aerodynamic and Aeroacoustical Characteristics of Low Reynolds Number Two-Dimensional Airfoil Flows
Aerodynamic and Aeroacoustical Characteristics of Low Reynolds Number Two-Dimensional Airfoil Flows
复制标题
低雷诺数二维翼型流的气动和气动声学特性
DOI：
10.1299/kikaib.73.2476
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
H. Fujita
中科院分区：
文献类型：
--
作者：
Yasumasa Suzuki;C. Kato;Tsuneo Suzuki;H. Fujita
本文给出了NACA 0012翼型在雷诺数为2×105 ×105，最大升力到深度失速迎角范围内的气动力和远场声的测量数据。在最大升力前，产生的声的总声级随迎角的增大而逐渐增大，在翼型失速时突然增大。然后，当攻角进一步增加时，声音的总体水平降低。在最大升力条件下，测量的表面压力显示在翼型吸力面上形成短气泡，并且对远场声的大部分贡献来自Strouhal数1到20的范围。在轻失速工况下，吸力面形成长气泡，测量的声谱单调衰减。在深度失速状态下，长气泡消失，气动噪声在低频和中频之间的频率范围内减小，只有在Strouhal数为0.6附近有一个微弱的峰值。
Presented in this paper are measured data of aerodynamics of a NACA 0012 airfoil and resulting far-field sound at a Reynolds number of 2×105 to 5×105 and angle of attack of lifting case around maximum lifting to deep stall case Overall level of the generated sound gradually grows with increase of the angle of attack until maximum lift angle, and suddenly increases when the airfoil is stalled. Then, the overall level of the sound decreases when the angle of attack is further increased. In the maximum lifting condition, the measured surface pressure showed short bubble formed on suction surface of the airfoil and most contributions to the far-field sound come from a Strouhal number range of 1 to 20. In the light stall condition, long bubble is formed on suction surface, and the measured sound spectra monotonously decay. In the deep stall condition, the long bubble is disappeared and aerodynamic sound decreases in the frequency range between low frequency and middle frequency except for a weak peak at a Strouhal number of near the 0.6.