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The pressure waves produced by the convection of temperature disturbances in high subsonic nozzle flows

Published online by Cambridge University Press:  19 April 2006

A. W. Bloy
A. W. Bloy
Affiliation:
Department of the Mechanics of Fluids, University of Manchester
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Abstract

The method of characteristics is used to calculate the unsteady one-dimensional flow produced by the convection of a temperature disturbance, contained between two contact surfaces, in high subsonic flow through a nozzle. The results show the development of the pressure disturbances which are associated with the force perturbation needed to accelerate the temperature disturbance at the same rate as the surrounding gas and propagate in both the upstream and downstream directions. Using a simple flow model, expressions for the mean pressure disturbances are derived and shown to be in good agreement with numerical solutions. Other numerical solutions which show the effect of changing the various flow parameters and the nozzle shape are presented. In all of the cases considered, the pressure disturbances caused by a 10 % change in the inlet temperature are significantly large and may be an important part of ‘excess’ noise.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 94 , Issue 3 , 16 October 1979 , pp. 465 - 475
Copyright
© 1979 Cambridge University Press

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References

Bohn, M. S. 1977 Response of a subsonic nozzle to acoustic and entropy disturbances. J. Sound. Vib. 52, 283.Google Scholar
Ffowcs Williams, J. E. & Howe, M. S. 1975 The generation of sound by density inhomogeneities in low Mach number nozzle flows. J. Fluid Mech. 70, 605.Google Scholar
Hoch, R. & Hawkins, R. 1973 Recent studies into Concorde noise reduction. AGARD Conf. Proc. no. 131, paper 19.Google Scholar
Howe, M. S. 1975 Contributions to the theory of aerodynamic sound, with application to excess jet noise and the theory of the flute. J. Fluid Mech. 71, 625.Google Scholar
Marble, F. E. & Candel, S. M. 1977 Acoustic disturbance from gas non-uniformities convected through a nozzle. J. Sound Vib. 55, 225.Google Scholar
Sedney, R. 1970 The method of characteristics. In Nonequilibrium Flows, part 2 (ed. P. P. Wegener), pp. 160–225. Dekker.
Whitfield, O. J. & Howe, M. S. 1976 The generation of sound by two-phase nozzle flows and its relevance to excess noise of jet engines. J. Fluid Mech. 75, 553.Google Scholar