NDLI: Viscous flow drag reduction by acoustic excitation

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Viscous flow drag reduction by acoustic excitation

Content Provider	NASA Technical Reports Server (NTRS)
Author	Nagel, Robert T.
Copyright Year	1986
Description	An experimental program in which the effectiveness of a single large eddy break up (LEBU) blade is enhanced by proper acoustic excitation is described. Acoustic waves are generated in response to the incident large scale eddies and directed at the blade trailing edge through the test surface floor below the manipulator blade. The acoustic input is phase locked to the incident flow. Control of the acoustic input apparently allows enhancement of the large eddy cancellation process leading to a decrease of skin friction coefficient. Control of this process with acoustic excitation indicates that vortex unwinding is the mechanism for large eddy destruction in the boundary layer. A deeper understanding of this phenomena could lead to better drag reduction technology and further understanding of the physics of the turbulent boundary layer.
File Size	979311
Page Count	27
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870017690
Archival Resource Key	ark:/13960/t3518wc26
Language	English
Publisher Date	1986-12-02
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Skin Friction Turbulent Boundary Layer Airfoils Aerodynamic Coefficients Vortex Breakdown Boundary Layer Control Vortex Alleviation Acoustic Excitation Drag Reduction Vortices Trailing Edges Wind Tunnel Tests Viscous Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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