S.M. Dash, N. Sinha, B.J. York

Our ability to predict the structure of supersonic jets and their noise emission is critically dependent on our ability to properly model the turbulence. This is quite difficult for highspeed flows where density fluctuations are significant and turbulent compressibility-effects influence the jet mixing and shock structure. In earlier work, a hybrid two-equation turbulence model (keCC/kW) was shown to perform reasonably well over a wide range of conditions for axisymmetric jets. This model is not readily extendible to more complex jets and recent data indicates that it does not reproduce the observed decrease in velocity fluctuations with increasing convective Mach numbers. A new two-equation model (keCD) has been formulated using compressible-dissipation concepts which shows promise of greater generality. Preliminary applications of this model to high-speed shear layers indicate that it does reproduce the trends of the recent data. The extension from shear layers to jets is not straightforward and is being guided by building-block data.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.643-654; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

supersonic flow, aeroacoustics

Bibliothek

1992