Mechanisms of transonic blade-vortex interaction noise

被引：0

作者：

Lent, H.-M. ^{[1
]}

Meier, G.E.A. ^{[1
]}

Mueller, K.J. ^{[1
]}

Obermeier, F. ^{[1
]}

Schievelbusch, U. ^{[1
]}

Schuermann, O. ^{[1
]}

机构：

[1] Max-Planck-Inst fuer, Stroemungsforschung, Goettingen, Germany

来源：

Journal of Aircraft | 1993年 / 30卷 / 01期

关键词：

Aerodynamics - Airfoils - Evaluation - Fluid structure interaction - Noise pollution - Propellers - Transonic flow - Unsteady flow - Vortex flow;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Experimental investigations of aerodynamic sound generation due to vortex-airfoil interaction in two-dimensional transonic flow were performed using two different experimental set ups - a vacuum-operated transonic wind tunnel and a shock tube. Flow visualization was accomplished by a Mach-Zehnder interferometer as well as by a holographic interferometer. The interferograms obtained were evaluated by an image processing system. In addition, pressure measurements were carried out in the shock tube which allows for a correlation of time-dependent pressure distributions and the density distributions evaluated from the interferograms. Two mechanisms of aerodynamic sound generation are identified. These are different from the dipole-like mechanism known for subsonic flowfields. The newly found sound waves are called 'transonic waves' and 'compressibility waves.' For both of them simple models have been suggested which can partly explain their occurrence and their strengths.

引用

页码：88 / 93