Experimental investigation of receptivity of a shear layer separating at aconvex corner

Authors
Citation
M. Asai et M. Kaneko, Experimental investigation of receptivity of a shear layer separating at aconvex corner, FLUID DYN R, 27(2), 2000, pp. 117-128
Citations number
16
Categorie Soggetti
Mechanical Engineering
Journal title
FLUID DYNAMICS RESEARCH
ISSN journal
01695983 → ACNP
Volume
27
Issue
2
Year of publication
2000
Pages
117 - 128
Database
ISI
SICI code
0169-5983(200008)27:2<117:EIOROA>2.0.ZU;2-W
Abstract
Receptivity of a shear layer separating at a convex corner in the wall is e xamined experimentally. Acoustic forcing is applied to excite instability w aves. Particular attention is focused on the comparison of receptivity coef ficient between a sharp-edged corner and a rounded corner whose radius of c urvature is 20 times the boundary-layer displacement thickness. The results clearly show that the receptivity coefficient is quite sensitive to the sh arpness of the corner and that the amplitude of the excited instability wav e is twice larger for the sharp corner compared with the rounded corner. Th e same dependency of the receptivity coefficient on the corner sharpness is verified by analyzing the shear layer response to wind-tunnel background n oise without acoustic forcing. (C) 2000 The Japan Society of Fluid Mechanic s and Elsevier Science B.V. All rights reserved.