23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-2.9.2

RELATIONSHIP BETWEEN INSTABILITY WAVES AND NOISE OF LOW SUPERSONIC JETS

C. Millet, G. Casalis
ONERA, France

Keywords: stability theory, axisymmetric jet, low supersonic flow

The paper is concerned with the transition from dissipative to dispersive cross-stream behaviour of large turbulence structures outside low supersonic axisymmetric cold jets. Such a transition arises in regions of physical space where noise is generated and depends to a large extent on the jet Mach number. It is shown how the issue of determining these regions can be reduced to analysing the pressure near field in terms of a truning-point problem.

view full paper