Etude de la Transition et de la Contamination de Bord d'Attaque sur Alles enFleche (Experimental Study of Transition and Leading Edge Contamination of Swept Wings)

摘要

The transition mechanisms in an incompressible laminar boundary layer developingon swept wings is investigated experimentally. The transition is detected by using hot films glued on the model. Two series of experiments are presented. In the first one, the sensors are placed along the chord, and the instantaneous signals allow us to analyze the problems of streamwise instability, crossflow instability, and leading edge contamination. In the second series of experiments, hot films are glued along the space direction, close to the leading edge. The leading edge contamination is studied in detail, and the possibilities of relaminarization are examined.