Abstract:

The long-term objective of the current research is to use computational aeroacoustics (CAA) methodology and parallel computers to increase the understanding of broadband blade noise. In a previous paper by the authors [D. P. Lockard and P. J. Morris, AIAA-97-0286 (1997)] the effect of thickness on the sound radiated by airfoils encountering incompressible, vortical gusts was investigated. This work extends those calculations by examining the effect of camber on the radiated noise. A two-dimensional, Navier-Stokes code, implemented using the message passing library and FORTRAN 90 on the IBM SP2, is used to perform the calculations. The code uses Runge-Kutta time integration and seven-point, central-difference, dispersion-relation-preserving spatial operators. A multigrid method is used to obtain converged steady-state solutions before the gust is introduced in a source region inside the domain. [Work supported by NASA Langley Research Center.]