Caractérisation de Sillage d'Avion de Transport par Vélocimétrie par Images de Particules (PIV)

Dans la phase d'atterrissage, ta distance minimale de sécurité entre les avions de transport dépend de l'intensité et de ta persistance de leurs sillages aérodynamiques. Cette distance augmente avec ta masse de I'avion de transport. Si bien que, dans le cas des gros avions de transport, l'avantage économique lie a leur grande capacité en passager est quelque peu atténue par des distances de sécurité plus grande qui en limite donc le flux passager. Devant l'augmentation continue du trafic aérien et le développement des gros avions de transport, différents travaux de recherche sont actuellement menés pour minimiser leur sillage

Quantitative Flow Field Measurements in a Catapult Facility using Particle Image Velocimetry

In order to investigate the long term behaviour of the wake vortex flow behind an aircraft, quantitative whole-field measurements have been carried out in a free flight analysis laboratory using the PIV (Particle Image Velocimetry) technique. Instantaneous velocity fields were measured in successive planes crosswise to the flight path of a free flying air-liner model, so that the evolution, interaction and decay of vortices originating from the wing, flap and slat tips can be described. The optical measurement system consisting of two aerosol generators for seeding, a pulsed laser system for illumination, two CCD cameras for image recording and trigger electronics for synchronisation had to be adapted to the particular test conditions of a catapult facility, where a long-lasting unsteady 'single event' initiated by the model's launch is subject of the experimental study. The paper focuses on the technical aspects of interfacing a catapult facility and a digital PIV syste

Institutional adaptation: Demands for management reform and university administration

Higher education organizations around the world have always faced environmental changes. However, in the past decade altered societal expectations, new public policies, and technological innovations have created an unprecedented set of challenges for universities. Although the borders of universities have opened in new ways for thei