03.2 - Experimental Aerodynamics
HOT-WIRE ANEMOMETRY OF THE BOUNDARY LAYER PRIOR TO A CAVITY IN RESPONSE TO VARIED UPSTREAM GEOMETRY
C.O.L. Hamilton Smith¹, N.J. Lawson¹; ¹The University of Sydney, Australia
Wind tunnel tests were conducted with hot-wire anemometry to map the boundary-layer prior to an open cavity of L/D = L/W = 3, at U = 10-20m/s. Changes in geometry up-stream were used to alter the boundary-layer profile, separation, acceleration and turbulence intensity, to see how the up-stream boundary-layer impacted cavity response. A number of complex geometry changes using fuselage and nose curvature controlled the boundary-layer . Results align with literature, where a thin boundary-layer returns more energetic excitation. In contrast, a thick boundary-layer was found to filter out detrimental acoustic phenomena. This data is part of a larger study, to see how BL data can be used to predict cavity spectral response and cavity feedback, to harvest energy inside the cavity.