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Summary of Feasibility of Generating an Artificial Burst in a Turbulent Boundary Layer Phase 2 by National Aeronautics and Space Adm Nasa PDF
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. Gad-El-hak, Mohamed Unspecified Center BOUNDARY LAYER CONTROL; CRUISING FLIGHT; DRAG REDUCTION; SKIN FRICTION; TURBULENT BOUNDARY LAYER; LAMINAR BOUNDARY LAYER; SUBSONIC SPEED; SUCTION; THICKNESS; WIND TUNNEL TESTS...
Detail About Feasibility of Generating an Artificial Burst in a Turbulent Boundary Layer Phase 2 PDF
- Author : National Aeronautics and Space Adm Nasa
- Publisher : Independently Published
- Genre : Science
- Total Pages : 132 pages
- ISBN : 9781731261991
- Release Date : 17 November 2018
- PDF File Size : 45,7 Mb
- Language : English
- Rating : 4/5 from 21 reviews
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