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UNSTEADY SURFACE PRESSURE INDUCED BY TURBULENCE OVER ASYMMETRICALLY BEVELED TRAILING EDGE

Yaoyi Guan
Department of Aerospace and Mechanical Engineering University of Notre Dame 119 Hessert Laboratory, Notre Dame, IN 46556 USA

Scott C. Morris
Department of Aerospace and Mechanical Engineering University of Notre Dame 110 Hessert Laboratory, Notre Dame, IN 46556 USA

Sinopsis

The characteristics of unsteady surface pressure (USP) induced by turbulent flow over a family of asymmetrically beveled trailing edges were studied experimentally. The geometries had a trailingedge angle ü = 25° with a flat lower surface and a rounded upper surface with radii of curvature between 1 and 6 times the airfoil thickness. The chord-based Reynolds number was Re = 2.1 × 106. A detailed description of the USP and flow fields around the trailing edge section was obtained by remote microphone probes (RMP) and particle image velocimetry (PIV), respectively. The beveled upper surface was characterized by a region of favorable pressure gradient, followed by a strong adverse pressure gradient. The cases with smaller radius of curvature were founded to exhibit larger separated region over the trailing edge. The spectral magnitudes of USP were largest in separation region. This paper is focused on scaling and understanding the USP spectra in regions of separated flow. The PIV measurements were utilized to provide the corresponding length and velocity scales.