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Boundary layer receptivity to free-stream sound on elliptic leading edges of flat plates

Published online by Cambridge University Press:  01 March 2001

JUAN B. V. WANDERLEY  and
THOMAS C. CORKE
JUAN B. V. WANDERLEY
Affiliation:
University of Notre Dame, Aerospace and Mechanical Engineering Department, Notre Dame, IN 46556, USA
THOMAS C. CORKE
Affiliation:
University of Notre Dame, Aerospace and Mechanical Engineering Department, Notre Dame, IN 46556, USA
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Abstract

The leading-edge receptivity to acoustic waves of two-dimensional bodies is investigated using a spatial solution of the Navier–Stokes equations in vorticity/stream function form in general curvilinear coordinates. The free stream is composed of a uniform flow with a superposed periodic velocity fluctuation of small amplitude. The method follows that of Haddad & Corke (1998), in which the solution for the basic flow and the linearized perturbation flow are solved separately. The initial motivation for the work comes from past physical experiments for flat plates with elliptic leading edges, which indicated narrow frequency bands of higher neutral-curve Branch I receptivity. We investigate the same conditions in our simulations, as well as on a parabolic leading edge. The results document the importance of the leading edge, junction between the ellipse and flat plate, and pressure gradient to the receptivity coefficient at Branch I. Comparisons to the past experiments and other numerical simulations showed the influence of the elliptic leading-edge/flat-plate joint as an additional site of receptivity which, along with the leading edge, provides a wavelength selection mechanism which favours certain frequencies through linear superposition.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 429 , 25 February 2001 , pp. 1 - 21
Copyright
© 2001 Cambridge University Press

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