Measurements in low-speed flow of unsteady pressure distributions on a rectangular wing with an oscillation control surface

Abstract

The report describes an experiment made jointly by an Anglo-French team to determine unsteady pressure distributions and forces on a low aspect ratio wing with an oscillating control surface. Two series of tests were made in the R.A.E. 5 ft low-speed wind tunnel at frequency parameters between 0.73 and 8.45. The pressure-measuring installations were of two types ; one consisted of a number of individual transducers, and the other employed a series of tubes connected to a single transducer via a pressure switch. The results were compared with calculations based on methods developed at R.A.E. and O.N.E.R.A. The tests showed that the measuring systems provided results which were in themselves consistent; there were, however, disparities between upper and lower surface oscillatory pressure distributions which made comparisons between theory and experiment difficult.