On the mitigation of landing gear noise using a solid fairing and a dense wire mesh
Artikel i vetenskaplig tidskrift, 2024
A solid fairing and a wire-mesh fairing consisting of very fine wires and pores are numerically and experimentally investigated for the mitigation of landing gear noise. A slightly modified LAGOON landing gear and two configurations, one equipped with a solid fairing and the other with a wire-mesh fairing, are numerically simulated using the Improved Delayed Detached-Eddy Simulation (IDDES) in combination with the Ffowcs Williams and Hawkings (FW-H) analogy. Instead of resolving the detailed flow features through the wire mesh, a recently proposed numerical model is used to represent the effect of the wire-mesh fairing. The simulated flow fields and the far-field noise spectra are validated against the experiments conducted in an anechoic wind tunnel. The superiority of the recently proposed wire-mesh model over a classical wire-mesh model in modeling both the aerodynamic and aeroacoustic effects of the wire mesh is demonstrated. Results also show that the dense wire-mesh fairing functions very similarly to the solid fairing and that significant noise can be reduced through the installation of a solid fairing or a wire-mesh fairing upstream of the landing gears. For the baseline landing gear, the torque link and the brakes are identified noise sources. With the aerodynamic penalty of a 50% increase in drag, both fairings mitigate the pressure fluctuation on the torque link and brakes, resulting in the reduction of surface noise sources. The noise directivity shows that a solid fairing or a dense wire-mesh fairing contributes to a noise reduction of 4-6 dB in all radial directions. The findings in this study pave the way for the low-noise design of aircraft landing gears.
Landing gear noise
Aeroacoustics
Add-on fairings
Wire mesh
Noise mitigation
Författare
Shuai Li
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Lars Davidson
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Peng Shia-Hui
Chalmers, Mekanik och maritima vetenskaper, Strömningslära
Alejandro Rubio Carpio
TU Delft
Daniele Ragni
TU Delft
Francesco Avallone
Politecnico di Torino
Alexandros Koutsoukos
TU Delft
Aerospace Science and Technology
1270-9638 (ISSN)
Vol. 153 109465INnoVative dEsign of iNstalled airframe componenTs for aircraft nOise Reduction - INVENTOR
Europeiska kommissionen (EU) (EC/H2020/860538), 2020-05-01 -- 2024-04-30.
Drivkrafter
Hållbar utveckling
Styrkeområden
Transport
Ämneskategorier
Teknisk mekanik
Strömningsmekanik och akustik
DOI
10.1016/j.ast.2024.109465