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

Mahesh Natarajan; Jonathan B. Freund; Daniel J. Bodony

doi:10.1016/j.crme.2018.07.005

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

Mahesh Natarajan, Jonathan B. Freund, Daniel J. Bodony

Research output: Contribution to journal › Short survey › peer-review

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 language	English (US)
Pages (from-to)	978-996
Number of pages	19
Journal	Comptes Rendus - Mecanique
Volume	346
Issue number	10
DOIs	https://doi.org/10.1016/j.crme.2018.07.005
State	Published - Oct 2018

Keywords

Active flow control
Global modes
Jet noise

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials

Online availability

10.1016/j.crme.2018.07.005

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title = "Global mode-based control of laminar and turbulent high-speed jets",

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.",

keywords = "Active flow control, Global modes, Jet noise",

author = "Mahesh Natarajan and Freund, {Jonathan B.} and Bodony, {Daniel J.}",

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year = "2018",

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T1 - Global mode-based control of laminar and turbulent high-speed jets

AU - Natarajan, Mahesh

AU - Freund, Jonathan B.

AU - Bodony, Daniel J.

PY - 2018/10

Y1 - 2018/10

N2 - 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.

AB - 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.

KW - Active flow control

KW - Global modes

KW - Jet noise

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U2 - 10.1016/j.crme.2018.07.005

DO - 10.1016/j.crme.2018.07.005

M3 - Short survey

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VL - 346

SP - 978

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JO - Comptes Rendus - Mecanique

JF - Comptes Rendus - Mecanique

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

Abstract

Keywords

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