Flight and tunnel measurements of pressure fluctuations on the upper surface of the wing of a Venom aircraft with a sharpened leading-edge

Abstract

Part span sharpened leading-edges were attached to the wing to produce regions of separated flow. Flight measurements were made of both the spectra and root-mean-square intensity of the pressure fluctuations at orifices at 1% and 60% of the local chord. Corresponding measurements on a model in a low speed wind tunnel covered a wider range of incidence and frequency than the flight tests. The flight test results are in good agreement with the tunnel results. The root-mean-square value of the pressure fluctuations, p, reached a maximum value of p/q = 0.072 for the 60% orifice at an incidence of 10 degrees. The incidence for buffet onset was close to that at which the break in the p/q vs. a curves for both orifices occurred.