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WALL PRESSURE STATISTICS IN A HIGH REYNOLDS NUMBER TURBULENT BOUNDARY LAYER

Joseph C. Klewicki
Department of Mechanical Engineering University of New Hampshire, Kingsbury Hall, W101, 33 Academic Way Durham, New Hampshire 03824, USA; Department of Mechanical Engineering University of Melbourne Melbourne, VIC 3010, Australia

B. F. Perkins
Physical Fluid Dynamics Laboratory Department of Mechanical Engineering University of Utah Salt Lake City, Utah

Meredith M. Metzger
Physical Fluid Dynamics Laboratory Department of Mechanical Engineering University of Utah Salt Lake City, Utah

Abstract

In order to better understand boundary layer turbulence at high Reynolds number, the fluctuating wall pressure was measured within the turbulent boundary layer that forms over the salt playa of Utah's west desert. Pressure measurements simultaneously acquired from an array of nine microphones were analyzed and interpreted. The wall pressure intensity was computed and compared with low Reynolds number data. This analysis indicated that the variance in wall pressure increases logarithmically with Reynolds number. Computed autocorrelations provide evidence for a hierarchy of surface pressure producing scales. Space-time correlations are used to compute broadband advection velocities. The advection velocity data indicate an approximately logarithmic increase in Ua with increasing axial sensor separations. To the author's knowledge, the present pressure measurements, to date, constitute the highest Reynolds number, low noise, well resolved measurements of fluctuating surface pressure.