Global mode-based control of laminar and turbulent high-speed jets

Mahesh Natarajan, Jonathan Freund, Daniel J Bodony

Research output: Contribution to journalShort survey

Abstract

The emitted noise from round jets is reduced using linear feedback controllers designed using structural sensitivity analysis. Linear global modes inform the selection and placement of the controller, and Navier–Stokes simulations are used to demonstrate effectiveness in a Mach-1.5 cold axisymmetric jet and in a Mach-0.9 cold turbulent jet. In both jets, each fitted with a cylindrical nozzle, the control reduces the radiated noise and modifies the baseflow in a way that enhances the relative amplitudes of low-frequency St≈0.05 global modes that do not have significant support in the acoustic field.

Original languageEnglish (US)
Pages (from-to)978-996
Number of pages19
JournalComptes Rendus - Mecanique
Volume346
Issue number10
DOIs
StatePublished - Oct 1 2018

Fingerprint

Mach number
Controllers
Acoustic fields
Sensitivity analysis
Nozzles
Feedback

Keywords

  • Active flow control
  • Global modes
  • Jet noise

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

Cite this

Global mode-based control of laminar and turbulent high-speed jets. / Natarajan, Mahesh; Freund, Jonathan; Bodony, Daniel J.

In: Comptes Rendus - Mecanique, Vol. 346, No. 10, 01.10.2018, p. 978-996.

Research output: Contribution to journalShort survey

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