Contribution
Prospects of Low-Noise-By-Design Approach for Airframe Components using the Lattice Boltzmann Method
* Presenting author
Abstract:
The emphasis of this work is on the Direct Noise Computation (DNC) of high-lift wing sections using the wall-modelled LES (WM-LES) Lattice Boltzmann Method (LBM). ProLB is used as a solver here. The investigation enhances the complexity of the representative high-lift wing by gradually incorporating a sweep component and a slat-track, which is a protruding structural element of the mechanism responsible for deploying and retracting the slat. During this investigation, it was verified with a clean slat configuration that the presence of a track in the slat cove increases the overall noise. As a means to actively reduce the increased noise levels, the creation of an air curtain in the track vicinity is envisaged. Aircurtain is realized by steadily blowing bleed air at the track. In addition to an active noise reduction measure, a passive noise reduction measure in the form of a porous glove is also investigated with the intention of decelerating the faster-moving oncoming free-stream flow in the track vicinity. We will discuss in detail the effectiveness and acoustic response of both active and passive noise reduction measures, namely air curtains and porous material.