Global mode-based control of supersonic jet noise

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recent evidence suggests that the loudest source of high-speed jet noise can be described as unsteady wavepackets that resemble instabilities. We seek to reduce their acoustic impact by developing a novel control strategy that uses global modes to model their dynamics and structural sensitivity of the linearized compressible Navier-Stokes operator to determine effective linear feedback control. Using co-located actuators and sensors we demonstrate the method on an axisymmetric Mach 1.5 jet issuing from a nozzle. Direct numerical simulations using this control show significant noise reduction, with additional reduction with increase in control gain. Analysis of the mean flow quantities show that the mean flow variation is the same for all the flows for approximately 15 jet radii downstream of the nozzle beyond which the changes become significant. A specific trend is observed in the downstream variation of jet half-width, momentum thickness and centerline axial velocity as the flow gets quieter. The quieter flows are also observed to have a stable shock-cell structure that extends much further downstream.

Original languageEnglish (US)
Title of host publication8th AIAA Flow Control Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624104329
StatePublished - Jan 1 2016
Event8th AIAA Flow Control Conference, 2016 - Washington, United States
Duration: Jun 13 2016Jun 17 2016

Publication series

Name8th AIAA Flow Control Conference

Other

Other8th AIAA Flow Control Conference, 2016
CountryUnited States
CityWashington
Period6/13/166/17/16

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Control and Systems Engineering
  • Aerospace Engineering

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  • Cite this

    Natarajan, M., Freund, J. B., & Bodony, D. J. (2016). Global mode-based control of supersonic jet noise. In 8th AIAA Flow Control Conference (8th AIAA Flow Control Conference). American Institute of Aeronautics and Astronautics Inc, AIAA.