Using Reynolds-Averaged Navier-Stokes Calculations to Predict Trailing-Edge Noise

作者：Glegg Stewart^*; Morin Bruce; Atassi Oliver; Reba Ramons

来源：AIAA Journal, 2010, 48(7): 1290-1301.

DOI：10.2514/1.38836

This paper describes a method for using Reynolds-averaged Navier Stokes calculations of the flow over an airfoil to calculate far-field sound spectra generated by boundary-layer turbulence interacting with the airfoil trailing edge. It is shown that a model of the spatial distribution of turbulent kinetic energy in a boundary-layer flow can be related to an integral of the local turbulence spectrum multiplied by a function of the mean flow velocity distribution. Inverting this relationship gives the turbulence spectrum required for calculations of the pressure on the surface beneath the boundary layer, hence the far-field sound radiated from a turbulent boundary layer interacting with a sharp trailing edge. Results are presented showing estimates of surface pressure spectra and radiated sound from a turbulent boundary layer flowing over the sharp trailing edge of a NACA 0012 airfoil, and they are compared with measurements of airfoils with different chord and Reynolds numbers. Also shown are predictions based on this approach for the self-noise from a 22 in. fan. The measured and predicted far-field sound spectra were found to show the same dependence on flow speed and close agreement in absolute level.

• 出版日期2010-7