Abstract

Turbulent boundary layer control (TBLC) for skin-friction drag reduction is a relatively new technology made possible through the advances in computational-simulation capabilities, which have improved the understanding of the flow structures of turbulence. Advances in micro-electronic technology have enabled the fabrication of active device systems able to manipulating these structures. The combination of simulation, understanding and micro-actuation technologies offers new opportunities to significantly decrease drag, and by doing so, to increase fuel efficiency of future aircraft. The literature review that follows shows that the application of active control turbulent skin-friction drag reduction is considered of prime importance by industry, even though it is still at a low technology readiness level (TRL). This review presents the state of the art of different technologies oriented to the active and passive control for turbulent skin-friction drag reduction and contributes to the improvement of these technologies.

Abstract

The high-level objective of MARS project was to understand the formation and behaviour of turbulent structures which affects the Reynolds stress and skin friction. The aim was, once understood, to apply flow control techniques in order to control these structures and reduce the overall drag derived from the Reynolds stress and mainly from the skin friction. Active flow control devices were the main interest; DBD plasma, Synthetic jets, Micro Blowing and Suction, Moving Surfaces were included on the list. To test all these devices, two test cases were defined, and a database and file repository were established in the project webserver. The present chapter is aimed to describe the test cases, including the set-up of the flow control devices, as well as to describe the file repository were all the data was stored.

Abstract

Abstract

Abstract

8th IFAC/IFORS/IMACS/IFIP Symposium on Large Scale Systems - Theory and Applications 1998 (LSS 98) -- JUL 15-17, 1998 -- RION, GREECE WOS: 000083105500054 A decentralized control approach for transportation networks to prevent traffic congestion is presented. The approach was developed by considering flow control and routing control together. The control algorithm is based on a previously proposed congestion measure. In this paper, in order to illustrate the performance of the proposed controller, some simulation results are presented. Copyright (C) 1998 IFAC. Int Federat Automat Control, Tech Comm Large Scale Syst, Tech Comm Mfg Modeling Management & Control, Tech Comm Adv Mfg Technol, Tech Comm Man Machine Syst, Int Federat Operat Res Soc, Int Assoc Math & Comp Simulat, Int Federat Informat Proc, Greek Minist Dev, Gen Secretariat Res & Dev, Tech Chamber Greece, European Commiss, DG III, Univ Patras, Res Comm, Greek Minist Culture, Greek Minist Educ