Global mode-based control of laminar and turbulent high-speed jets - 08/08/18
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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 
global modes that do not have significant support in the acoustic field.
Keywords : Active flow control, Global modes, Jet noise
Plan
| ☆ | Financial support from the United States Office of Naval Research (Drs. Brenda Henderson, Joseph Doychak and Knox Millsaps, technical monitors) is gratefully acknowledged (grant no. N00014-13-1-0545). This material is also based in part upon work supported by the Department of Energy, National Nuclear Security Administration, under Award Number DE-NA0002374. |
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