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Resonant interaction of a linear array of supersonic rectangular jets: an experimental study

Published online by Cambridge University Press:  26 April 2006

Ganesh Raman  and
Ray Taghavi
Ganesh Raman
Affiliation:
NYMA Inc., Experimental Fluid Dynamics Section, NASA Lewis Research Center Group, Brookpark, OH 44142, USA
Ray Taghavi
Affiliation:
Department of Aerospace Engineering, University of Kansas, Lawrence, KS 66045, USA
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Abstract

This paper examines a supersonic multi-jet interaction problem that we believe is likely to be important for mixing enhancement and noise reduction in supersonic mixer-ejector nozzles. We demonstrate that it is possible to synchronize the screech instability of four rectangular jets by precisely adjusting the inter-jet spacing. Our experimental data agree with a theory that assumes that the phase-locking of adjacent jets occurs through a coupling at the jet lip. Although synchronization does not change the frequency of the screech tone, its amplitude is augmented. The synchronized multi- jets exhibit higher spreading than the unsynchronized jets, with the single jet spreading the least. We compare the near-field noise of the four jets with synchronized screech to the noise of the sum of four jets operated individually. Our noise measurements reveal that the more rapid mixing of the synchronized multi-jets causes the peak jet noise source to move upstream and to radiate noise at larger angles to the flow direction. Based on our results, we have grounds to believe that screech synchronization is advantageous for noise reduction internal to a mixer-ejector nozzle, since the noise can now be suppressed by a shorter acoustically lined ejector.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 309 , 25 February 1996 , pp. 93 - 111
Copyright
© 1996 Cambridge University Press

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