H. Kawazoe, Y. Nakamura, Y. Ikeda

High speed axisymmetric jet up to the sonic speed was studied to analyze the aerodynamic sound from jet alone and the interaction of jet shear flow with plate edge. The specific objectives of the present research are to investigate the effects of Reynolds and Mach numbers on sound generation and to clarify sound generation mechanism by the interaction. There was a hypothesis proposed that the aerodynamic sound is generated by vortex impinging on the plate edge periodically. The more the impinging vortex grows, the larger the sound becomes. Vortex pairing plays an impotant mechanism in producing such a finite vortex. When the paired vortex impinges on the plate edge periodically, the pressure fluctuation with the same frequency propagates into the whole flow field, mainly through the shear layer. Therefore, the shear layer is excited at this frequency, and it stimulates generation of such a vortex. Thus, high SPL sound is generated.

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.525-534; 1995; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1995