NDLI: Supersonic Jet Noise Reduction Using Fluidics, Mechanical Chevrons and Fluidically Enhanced Chevrons

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Munday, David Heeb, Nick Gutmark, Ephraim Liu, Junhui Kailasanath, K.
Copyright Year	2010
Abstract	This paper presents observations and simulations of the impact of several technologies on modifying the flow field and acoustic emissions from supersonic jets from nozzles typical of those used on military aircraft. The flowfield is measured experimentally by shadowgraph and particle image velocimetry (PIV). The acoustics are characterized by near and far-field microphone measurements. The flow and near-field pressures are simulated by monotonically integrated large-eddy simulation (MILES). Use of unstructured grids allows accurate modeling of the nozzle geometry. The nozzle geometries used in this research are representative of practical engine nozzles. The emphasis of the work is on “off-design” or non-ideally expanded flow conditions. The technologies applied to these nozzles include chevrons, fluidic injection and fluidically enhanced chevrons. The fluidic injection geometry and fluidic enhancement geometry follow the approach found successful for subsonic jets by Alkislar, Krothapalli & Butler [1] employing jets pitched 60° into the flow, impinging on the shear layer just past the tips of the chevrons, or in the same axial position when injection is without chevrons.
Sponsorship	International Gas Turbine Institute
Starting Page	401
Ending Page	409
Page Count	9
File Format	PDF
ISBN	9780791843963
DOI	10.1115/GT2010-23715
e-ISBN	9780791838723
Volume Number	Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials and Metallurgy
Conference Proceedings	ASME Turbo Expo 2010: Power for Land, Sea, and Air
Language	English
Publisher Date	2010-06-14
Publisher Place	Glasgow, UK
Access Restriction	Subscribed
Subject Keyword	Acoustics Flow (dynamics) Modeling Noise control Engines Microphones Design Geometry Large eddy simulation Simulation Particulate matter Jets Military aircraft Nozzles Engineering simulation Shear (mechanics) Acoustic emissions
Content Type	Text
Resource Type	Article

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