T. Carolus, T. Fuest, M. Beiler

The broad band noise of a low pressure axial fan without guide vanes is computed and compared with measurements. The acoustic model uses the idea of randomly fluctuating forces which can be expressed in terms of the distribution of fluctuating pressure on the blade surface and a correlation area. The spectrum of the surface pressure is taken from measurements on surfaces and rotating fan blades in turbulent flows which are non-dimensionalized by the boundary layer displacement thickness and the freestream flow velocity. The boundary layer displacement thickness and the freestream flow velocity on the fan blades are estimated from detailed results of a numerical 3-D steady state flow field analysis. The computed sound power spectrum of the fan broad band noise agrees well with the measured spectrum.

First Joint CEAS/AIAA Aeroacoustics Conference, München, 1995

Conference Paper

englisch

21,0 x 29,7 cm, 6 Seiten

DGLR-Bericht, 1995, 1995-01, First Joint CEAS/AIAA Aeroacoustics Conference - Proceedings; S.151-156; 1995; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1995