C.-H. Hsu, P. Spence, F. Farssat

A hybrid aerodynamic-aeroacoustic method has been developed and applied to predicting the tonal noise of a Boeing ducted fan model tested at low speed. The steady-state threedimensional flow field was obtained by solving Navier-Stokes equations using an explicit, timemarching, finite volume, multigrid, multiblock, and central difference algorithm. With the input of near field aerodynamics, the radiated acoustic field from the ducted fan was computed by using a Galerkin finite element procedure with conventional finite elements in the near field and wave envelope elements in the far field. Three cases were studied including the effect of boundary layer suction on the inner cowl wall. Aerodynamic calculations show that acoustic waves are captured in the inlet duct. The predicted noise directivity and sound pressure levels are in good agreement with Boeing measured data.

First Joint CEAS/AIAA Aeroacoustics Conference, München, 1995

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

DGLR-Bericht, 1995, 1995-01, First Joint CEAS/AIAA Aeroacoustics Conference - Proceedings; S.555-564; 1995; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1995