An experimental study on aerodynamic sound generated from wake interaction of circular cylinder and airfoil with attack angle in tandem

被引：11

作者：

Munekata, Mizue ^{[1
]}

Koshiishi, Ryuta ^{[1
]}

Yoshikawa, Hiroyuki ^{[1
]}

Ohba, Hideki ^{[1
]}

机构：

[1] Dept Mech System Engn, Kumamoto 8608555, Japan

来源：

JOURNAL OF THERMAL SCIENCE | 2008年 / 17卷 / 03期

关键词：

aerodynamic sound; wake interaction; circular cylinder; airfoil; Karman's vortex; flow visualization;

D O I：

10.1007/s11630-008-0212-9

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In our previous study, the effects of the interval between the cylinder and the airfoil on the aerodynamic sound were investigated and compared with the cases of single circular and single airfoil. In this study, the effects of the attack angle of the airfoil located downstream on the characteristics of aerodynamic sound and the wake structure are investigated at a given interval between the cylinder and the airfoil. It is found that the sound pressure level of DFN and the peak frequency decrease with increasing attack angle of airfoil because of the diffusive wake structure due to the increased back pressure of circular cylinder, which is caused by the blocking effect of airfoil. It is shown that the sound sources are corresponded to the attack points of shedding vortex form the upstream circular cylinder to the downstream airfoil. We conclude that the pressure fluctuation at the airfoil surface effects on the sound pressure level, from the flow visualizations and the exploration test of sound source.

引用

页码：212 / 217

页数：6

共 11 条

[1] MEASUREMENT OF ACOUSTIC INTENSITY USING CROSS-SPECTRAL DENSITY OF 2 MICROPHONE SIGNALS [J].