NDLI: Microblowing technique demonstrated to reduce skin friction

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Microblowing technique demonstrated to reduce skin friction

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hwang, Danny P. Biesiadny, Tom J.
Copyright Year	1998
Description	One of the most challenging areas of research in aerodynamics is the reduction of skin friction, especially for turbulent flow. Reduced skin friction means less drag. For aircraft, less drag can lead to less fuel burned or to a greater flight range for a fixed amount of fuel. Many techniques and methods have been tried; however, none of them has significantly reduced skin friction in the flight environment. An innovative skin-friction reduction technique, the Microblowing Technique (MBT), was invented in 1993. This is a unique concept in which an extremely small amount of air is blown vertically at a surface through very small holes. It can be used for aircraft or marine vehicles, such as submarines (where water is blown through the holes instead of air). As shown in the figure, the outer layer, which controls vertical flow, is a plate with high-vertical holes. The inner layer, which produces evenly distributed flow, is a low-permeability porous plate. Microblowing reduces the surface roughness and changes the flow velocity profile on the surface, thereby reducing skin friction.
File Size	20837
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20050177878
Archival Resource Key	ark:/13960/t6xw9c19j
Language	English
Publisher Date	1998-04-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Friction Reduction Water Turbulent Flow Drag Skin Friction Aerodynamics Flow Velocity Surface Roughness Permeability Velocity Distribution Porous Plates Submarines Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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