Title: Understanding and Prediction of Lobed Mixer Noise

Sponsor:  Ohio Aerospace Institute (Aeroacoustics Research Council)

PIs:   A. Lyrintzis and G. Blaisdell

Summary:

The objective here is to create a stand-alone RANS based prediction method for jet noise from forced mixers. First we will assess the capabilities of Reynolds Averaged Navier-Stokes (RANS) solvers to accurately predict the turbulent properties of a jet plume for both simple and complex geometries.  The RANS results will be compared to data from the recent experiments at NASA Glenn.  Then we will investigate correlations between the turbulent properties in the plume of an internally forced mixed jet with the parameters of a two-source noise model, which an extension for lobed mixer jet noise of the four-source model [Fisher et al.].  We will also investigate modeling of the additional source referred to as `high-frequency lift' [Tester 2004].  Flight effects will also be studied.