INVESTIGATION OF THE UNSTEADY PRESSURE-FLUCTUATIONS ON AN F A-18 WINGAT HIGH-INCIDENCE/

The results of an analysis performed on the unsteady pressure measurem ents taken from the wing of an instrumented rigid 6% scale model of th e F/A-18 aircraft at high angles of attack are described. The experime nt was carried out at the Institute for Aerospace Research 1.5-m triso nic blowdown wind tunnel. Space-time cross-correlations of the pressur e field were performed on the wing upper surface using different refer ence transducers. The results are presented in the attached flow regio n on the inboard portion of the wing, which is under the influence of the leading-edge extension vortex system. The convection velocities of the broadband eddies were computed. The variation of the correlation contours of eddies along a typical skin-friction line is illustrated b y an example.