Turbulent Skin-Friction Drag Reduction By Active and Passive Means. Part 1. Everything You Wanted to Know about Riblets, LEBUs and Other Devices PDF Download
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Author: E. Coustols
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
The purpose of this paper is to provide a current overview of turbulent skin friction drag reduction concepts which have potential for reducing aircraft fuel consumption. Then, this review lectures will be organized around four main topics. First, after briefly reviewing what is known about the structure of the turbulent boundary layer, possible mechanisms for both active and passive devices will be discussed ; concentrating on techniques offering nett drag benefits, either through inner or outer layer manipulation. Indeed, both experimental and numerical results will be presented for these boundary layer manipulators. Available data and computer model predictions for low and high subsonic speeds, transonic conditions, and supersonic flow (including flight tests) will be reviewed.
Author: E. Coustols
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
The purpose of this paper is to provide a current overview of turbulent skin friction drag reduction concepts which have potential for reducing aircraft fuel consumption. Then, this review lectures will be organized around four main topics. First, after briefly reviewing what is known about the structure of the turbulent boundary layer, possible mechanisms for both active and passive devices will be discussed ; concentrating on techniques offering nett drag benefits, either through inner or outer layer manipulation. Indeed, both experimental and numerical results will be presented for these boundary layer manipulators. Available data and computer model predictions for low and high subsonic speeds, transonic conditions, and supersonic flow (including flight tests) will be reviewed.
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 300
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Book Description
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1396
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 712
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Book Description
Author: E. Coustols
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
The use of in-flow manipulator devices, such as LEBU's originated from research into the optimum use of screens and honeycombs for controlling (reducing) free-stream turbulence in wind tunnels 197. Such 'flow management' techniques were first applied to boundary layers by researchers at NAL Bangalore about 15 years ago 198, and a rapid succession of further studies (conducted first at IIT 199, NASA 2OO in the USA, then at the FFA in Sweden 201 and the Cavendish Laboratory of the University of Cambridge, England 202) led to the identification of single or preferably tandem (in-line) thin element devices as the best means of achieving any nett drag reduction.
Author: Xenia Klinger
Publisher:
ISBN: 9780662191384
Category : City planning
Languages : en
Pages : 79
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Book Description
Author: Royal Aeronautical Society
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 282
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Book Description
Author: John Michael Gregory
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 266
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Book Description
Author: Sung Moon Kang
Publisher:
ISBN: 9780542796845
Category :
Languages : en
Pages : 320
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Book Description
This linear model was used to develop reduced-order linear-quadratic-Gaussian (LQG) controllers. While these controls could achieve significant drag reduction, they appeared to be a performance limit. However, they could induce transient sublaminar drag under certain conditions. A nonlinear minimization using full-order nonlinear simulations was attempted to capture this transient behavior on a periodic basis. The upstream traveling wave was discovered in the course of that study.
Author: Mohamed Gad-el-Hak
Publisher: Cambridge University Press
ISBN: 0521770068
Category : Science
Languages : en
Pages : 445
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Book Description
A thorough treatment of the basics of flow control and flow control practices.
