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Tuesday, July 9 • 15:50 - 16:10
AEROACOUSTIC DESIGN AND BROADBAND NOISE PREDICTIONS OF A FAN STAGE WITH SERRATED OUTLET GUIDE VANES

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Over the past few years, turbulence interaction noise reduction using leading edge serrations has been extensively studied by ONERA, ISVR and UCAM. Although promising results have been found in experimental, analytical and numerical studies using isolated aerofoils, the use of leading edge serrations on realistic fan-OGV stages remains challenging from an industrial perspective. The present work, realized in the framework of the European TurboNoiseBB project, presents the aeroacoustic design of serrated OGVs (Outlet Guide Vanes), including details on their broadband noise and aerodynamic performance. The serrated OGV corresponds to a modified OGV from a fan/OGV stage that has been tested at the ANECOM facility (Germany) and shared by the Consortium. Leading edge serrations with sinusoidal patterns with varying amplitude and wavelength along the span are designed in collaboration with Safran Aircraft Engines. Particularly, leading edge serrations are adjusted to account for the turbulence characteristics provided by RANS calculations. Optimal leading edge parameters are found using simple design rules discussed in the paper. 3D broadband noise simulations are performed using an in-house CAA solver that solves the linearized Euler equations with a synthetic turbulence model (based on a Fourier mode decomposition with random phases and a von-Karman turbulence spectrum calibrated by RANS). An analytical formulation proposed by UCAM for serrated flat plates is also implemented and applied for additional comparisons. The content of the paper is organized as follows. Firstly, down selection of serrated OGV designs satisfying industrial specifications (patent pending) is discussed. RANS and CAA computations then are briefly described. Secondly, numerical solutions of the baseline case (straight leading edge) are compared to Amiet-based predictions and to available measurements. Finally, acoustic results from serrated OGVs are compared to the baseline case, and the impact on aerodynamic performances as well as an assessment of the sound power level reduction are presented.

Moderators
KH

Kaveh Habibi

Sr. Aeroacoustics Engineer, Siemens Gamesa Renewable Energy
LM

Luc Mongeau

Prof., McGill University
MR

Michel Roger

Professeur, Ecole Centrale de Lyon

Authors

Tuesday July 9, 2019 15:50 - 16:10 EDT
St-Laurent 6
  T03 Aero… aircrft noise & vibr., RS01 Aeroacoustics