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Reduction of noise in cold and hot supersonic jets using active flow control guided by a genetic algorithm

Published online by Cambridge University Press:  02 December 2022

Fernando Zigunov Open the ORCID record for Fernando Zigunov [Opens in a new window] ,
Prabu Sellappan Open the ORCID record for Prabu Sellappan [Opens in a new window]  and
Farrukh. S. Alvi
Fernando Zigunov*
Affiliation:
Department of Mechanical Engineering, FAMU-FSU College of Engineering, FL 32310, USA
Prabu Sellappan
Affiliation:
Department of Mechanical Engineering, FAMU-FSU College of Engineering, FL 32310, USA
Farrukh. S. Alvi
Affiliation:
Department of Mechanical Engineering, FAMU-FSU College of Engineering, FL 32310, USA
*
†Email address for correspondence: fzigunov@gmail.com
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Abstract

This study demonstrates an experimental platform for active jet noise reduction comprising of an automated system that performs a search for the optimal actuator locations and parameters, powered by a genetic algorithm (GA). Sideline noise reduction levels of 7.3 dB were achieved for a cold overexpanded (nozzle pressure ratio, $NPR=2.8$) jet, beyond the state-of-the-art for jet noise reduction with air injection. The reduction in noise was achieved at a mass flow rate of 1.4 % of the main jet, requiring no prior knowledge of the flow physics to inform the placement of the actuators. The same actuator pattern was tested in hot conditions (nozzle temperature ratio, $NTR=1.88$), achieving 4.7 dB sideline noise reduction. Detailed examination of the solutions obtained unveils some of the mechanisms leveraged by the GA to accomplish these high levels of noise reduction through microphone measurements and schlieren flow visualization. The GA found that actuating at the diverging wall of the convergent–divergent nozzle, where flow is supersonic, is very effective when combined with air injection near the nozzle lip, outside of the nozzle. Although the external actuation is effective at eliminating the screech tone, it is by actuating inside the nozzle at the diverging wall that sufficient disruption of the shock cell train can be achieved in order to reduce the broadband shock-associated noise.

JFM classification

Acoustics: Noise control Compressible Flows: Supersonic flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 952 , 10 December 2022 , A40
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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References

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