Coupled unsteady RANS and FW-H methodology for aeroacoustics prediction of high-speed propellers
Paper in proceeding, 2022

This work investigates the use of solid and permeable surfaces in the Ffowcs WilliamsHawkings (FW-H) analogy for predicting high-speed propeller noise. The CFD/CAA methodology encompasses unsteady Reynolds-Averaged Navier-Stokes simulations to compute the flowfield on the acoustic surface applied in the FWH analogy to obtain the noise signatures in the far-field. Furthermore, this manuscript also investigates the effects of the downstream end-cap position, on the propeller noise prediction, by using two permeable surfaces with different lengths to assess the propeller noise levels in each case. The former is a short SFW-H surface placed near the rotor, and the latter, namely the LFW-H, is a surface larger in length where the end-cap grid is placed farther downstream from the rotor. The results showed the capability of the permeable surface technique for predicting the noise with higher accuracy than the solid formulation, especially at the first blade passing frequency. Also, the larger LFW-H surface performed better than the SFW-H surface. A reason that could justify this is that the LFW-H end-cap surface is placed at a suitable distance downstream from the propeller. Therefore, the LFW-H surface can include more of the contributions of the non-linear effects or quadrupole sources enclosed within the permeable source surface region.

Author

Fabíola Paula Costa

Instituto Tecnológico de Aeronáutica (ITA)

Niklas Andersson

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

J. T. Takachi

Instituto Tecnológico de Aeronáutica (ITA)

Cleverson Bringhenti

Instituto Tecnológico de Aeronáutica (ITA)

28th AIAA/CEAS Aeroacoustics Conference, 2022

AIAA 2022-3089
9781624106644 (ISBN)

28th AIAA/CEAS Aeroacoustics Conference, 2022
Southampton, United Kingdom,

Subject Categories

Meteorology and Atmospheric Sciences

Manufacturing, Surface and Joining Technology

Fluid Mechanics and Acoustics

DOI

10.2514/6.2022-3089

More information

Latest update

8/8/2022 8