Contribution
Revisiting the BTGNX - Localization of Sound Sources in Tip-Gap Flow
* Presenting author
Abstract:
At last year’s DAGA results for the Brunswick Tip-Gap Noise-Experiment (BTGNX) were presented. The aim of the BTGNX was to provide high-fidelity data for the aeroacoustics caused by the complex flow in the gap between an airfoil and a flat plate, which represents e.g. the flow between an axial fan blade and the wall ring.This work mainly focusses on the localization of sound sources in the tip-gap region. The sound source localization is performed with conventional beamforming algorithms. Additionally, the recently proposed localization using the diffraction filter is also shown and compared to the conventional approach. Here the influence of the winglet geometry, which significantly affects the tip-gap flow and the resulting acoustics, will be highlighted. The localization is performed for four different winglet geometries in the reference configuration (u = 40 m/s, 10 mm tip-gap, AoA = 12°). The numerical data is provided by scale-resolved CFD simulations using the commercial software Star-CCM+.