Turbulent Skin-Friction Drag Reduction By Active and Passive Means. Part 1. Everything you wanted to Know about Riblets, LEBUs and Other Devices,
OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES TOULOUSE (FRANCE)
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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.
- Fluid Mechanics