Further Development and Initial Validation of Innovative DES-Based Approaches for the Prediction of Jet Noise Installation Effects

Abstract

Further development and validation of an innovative DES-based methodology for the prediction of jet noise from installed configurations is presented. A Grey-Area improved Delayed Detached-Eddy Simulation (DDES) model has been implemented in an industrial solver and validated for a static single-stream jet. The measured far-field sound directivity was predicted to within 2 dB and frequencies up to around St = 2 to 3 were resolved on a grid of 15.4M cells. To address the key problem of defining a suitable location of the data surface for Ffowcs Williams & Hawkings (FWH) far-field integration, a sensor function based on a statistical evaluation of the vorticity magnitude is proposed. This is applied to a complex installed jet/wing configuration, for which predicted far-field noise levels are shown. A strong increase in noise due to the presence of the wing of up to 18 dB in the forward arc is reported. This interaction noise becomes stronger and shifts to higher frequencies when the wing is moved closer to the jet.