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Comptes Rendus Physique
Volume 6, n° 4-5
pages 487-499 (mai-juin 2005)
Doi : 10.1016/j.crhy.2005.05.006
Airplane trailing vortices and their control
Tourbillons de sillages dʼavions et leur contrôle
 

Jeffrey Crouch
Boeing Commercial Airplanes, Seattle, USA 

Abstract

Airplane trailing vortices are examined under natural and forced conditions. Control strategies are presented, which aim to reduce the potential for severe upsets resulting from encounters with the vortices. These range from passive control, using spanload modifications, up to active control, using control-surface oscillations. Flight-simulator results are used to judge the effectiveness of the different control strategies. Active control is shown to be effective for breaking up the trailing vortices, and for reducing the potential for severe vortex-encounter upsets. Stability theory is used to explain the mechanisms underlying this form of control. To cite this article: J. Crouch, C. R. Physique 6 (2005).

The full text of this article is available in PDF format.
Résumé

Les tourbillons de sillages dʼavions sont examinés sous lʼangle de leur contrôle. Diverses stratégies visant à réduire les conséquences de la rencontre dʼun avion avec les tourbillons dʼun avion qui le précède sont ainsi analysées. Ces stratégies couvrent le cas dʼun contrôle passif, basé uniquement sur une modification du plan de voilure, jusquʼà celui dʼun contrôle actif consistant à faire osciller certaines surfaces portantes. Lʼefficacité de ces approches est évaluée à partir des résultats dʼun simulateur de vol. On montre que le contrôle actif réduit significativement le danger potentiel de lʼinteraction avion/sillage quand ce contrôle permet de faire interférer de manière destructive les tourbillons. Les mécanismes physiques sous jacents à cette méthode de contrôle sont explicités. Pour citer cet article : J. Crouch, C. R. Physique 6 (2005).

The full text of this article is available in PDF format.

Keywords : Vortices, Vortex breakup, Active control, Vortex encounters, Instability, Transient growth, Floquet theory

Mots-clés : Tourbillons, Sillages dʼavions, Contrôle, Instabilités, Croissances transitoires, Théorie de Floquet




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