NDLI: Feasibility of generating an artificial burst in a turbulent boundary layer, phase 2

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Feasibility of generating an artificial burst in a turbulent boundary layer, phase 2

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gad-El-hak, Mohamed
Copyright Year	1989
Description	Various drag accounts for about half of the total drag on commercial aircraft at subsonic cruise conditions. Two avenues are available to achieve drag reduction: either laminar flow control or turbulence manipulation. The present research deals with the latter approach. The primary objective of Phase 2 research was to investigate experimentally the feasibility of substantially reducing the skin-friction drag in a turbulent boundary layer. The method combines the beneficial effects of suction and a longitudinally ribbed surface. At a sufficiently large spanwise separation, the streamwise grooves act as a nucleation site causing a focusing of low-speed streaks over the peaks. Suction is then applied intermittently through longitudinal slots located at selected locations along those peaks to obliterate the low-speed regions and to prevent bursting. Phase 2 research was divided into two tasks. In the first, selective suction from a single streamwise slot was used to eliminate either a single burst-like event or a periodic train of artificially generated bursts in laminar and turbulent boundary layers that develop on a flat plate towed in a water channel. The results indicate that equivalent values of the suction coefficient as low as 0.0006 were sufficient to eliminate the artificially generated bursts in a laminar boundary layer.
File Size	59221793
Page Count	131
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890008459
Archival Resource Key	ark:/13960/t3615xs3n
Language	English
Publisher Date	1989-03-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Suction Thickness Laminar Boundary Layer Subsonic Speed Drag Reduction Skin Friction Wind Tunnel Tests Turbulent Boundary Layer Cruising Flight Boundary Layer Control 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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