W.R. Quinn

Results of an experimental study of a turbulent free jet of air issuing from a sharp-edged square slot into still air surroundings are presented. The quantities measured directly, using hot-wire anemometry, include: the three components of the mean velocity vector, the three Reynolds normal stresses and the two Reynolds primary shear stresses. It was found that the near flow field of the jet is dominated by four sets of counterrotating streamwise vortices. These vortices, which represent Prandtls secondary flow of the first kind, are generated from distributed vorticity shed from the four corners of the slot by skewing of the shear layers as a result of the vena contracta effect. Also, mean streamwise velocity off-center peaks were found in the very near flow field; such mean streamwise velocity off-center peaks may be the result of the self-induction of the stream wise vortices.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 8 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.287-294; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1992