Low-Speed Wind-Tunnel Measurements on a Thin Sharp-Edged Delta Wing with 700 Leading-Edge Sweep, with Particular Reference to the Position of Leading-Edge-Vortex Breakdown

摘要

The position of the breakdown of the tightly rolled leading-edge vortex was observed using a smoke technique. The breakdown point moved forward with increasing incidence, and reached a point above the trailing edge at an incidence of 32°. It moved forward to transverse planes through 0.5 and 0.28 of the centre¬line chord at 34° and 37° incidence respectively.nThe root-mean-square intensity and the low-frequency component of pressure fluctuations both began to rise rapidly at approximately the same incidence (31°) at four widely spaced points on the wing. This rise in pressure fluctuations was accompanied by a similar increase in the low-frequency component of normal-force fluctuations.