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Active control of noise from hot, supersonic turbulent jets

Colonius, Tim and Towne, Aaron and Schlinker, Robert H. and Reba, Ramons A. and Shannon, Dan (2014) Active control of noise from hot, supersonic turbulent jets. In: 168th Meeting of the Acoustical Society of America, 27-31 October 2014, Indianapolis, IN.

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We report on an experimental and reduced-order modeling study aimed at reducing mixing noise in hot supersonic jets relevant to military aircraft. A spinning valve is used to modulate four injection nozzles near the main jet nozzle lip over a range of frequencies and mass flow rates. Diagnostics include near-, mid-, and far-field microphone arrays aimed at measuring the effect of actuation on the near-field turbulent wavepacket structures and their correlation with mixing noise. The actuators provide more than 4 dB noise reduction at peak frequencies in the aft arc, and up to 2 dB reduction in OASPL. Experiments are performed to contrast the performance of steady and unsteady blowing with different amplitudes. The results to date suggest that the noise reduction is primarily associated with attenuated wave packet activity associated with the rapidly thickened shear layers that occur with both steady and unsteady blowing. Mean flow surveys are also preformed and serve as inputs to reduced-order models for the wave packets based on parabolized stability equations. These models are in turn used to corroborate the experimental evidence suggesting mechanisms of noise suppression in the actuated flow.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription ItemConference Site ItemConference Program
Colonius, Tim0000-0003-0326-3909
Towne, Aaron0000-0002-7315-5375
Additional Information:© 2014 Society of America. Published Online: 23 October 2014.
Subject Keywords:Supersonics; Spin valves; Fluid jets; Signal processing; Microphone array; Flow boundary effects; Aircraft
Record Number:CaltechAUTHORS:20190712-112320906
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97102
Deposited By: Melissa Ray
Deposited On:15 Jul 2019 14:47
Last Modified:16 Nov 2021 17:26

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