NDLI: Enhanced viscous flow drag reduction using acoustic excitation (Document No: 19880012911)

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Enhanced viscous flow drag reduction using acoustic excitation (Document No: 19880012911)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Nagel, R. T.
Copyright Year	1988
Description	Large eddy break up devices (LEBUs) constitute a promising method of obtaining drag reduction in a turbulent boundary layer. Enhancement of the LEBU effectiveness by exciting its trailing edge with acoustic waves phase locked to the large scale structure influencing the momentum transfer to the wall is sought. An initial estimate of the required sound pressure level for an effective pulse was obtained by considering the magnitude of the pressure perturbations at the near wake of a thin plate in inviscid flow. Detailed skin friction measurments were obtained in the flow region downstream of a LEBU excited with acoustic waves. The data are compared with skin friction measurements of a simply manipulated flow, without acoustic excitation and with a plain flow configuration. The properties and the scales of motion in the flow regime downstream of the acoustically excited LEBU are studied. A parametric study based upon the characteristics of the acoustic input was pursued in addition to the careful mapping of the drag reduction phenomenon within the acoustically manipulated boundary layer. This study of boundary layer manipulation has lead to improved skin friction drag reduction and further understanding of the turbulent boundary layer.
File Size	4976882
Page Count	114
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880012911
Archival Resource Key	ark:/13960/t1bk6890n
Language	English
Publisher Date	1988-01-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Acoustic Excitation Drag Reduction Skin Friction Flow Distribution Trailing Edges Wind Tunnel Tests Turbulent Boundary Layer Inviscid Flow Mapping Pressure Measurement Velocity Measurement 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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