On the mitigation of landing gear noise using a solid fairing and a dense wire mesh
Journal article, 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
Author
Shuai Li
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Lars Davidson
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Peng Shia-Hui
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Alejandro Rubio Carpio
Delft University of Technology
Daniele Ragni
Delft University of Technology
Francesco Avallone
Polytechnic University of Turin
Alexandros Koutsoukos
Delft University of Technology
Aerospace Science and Technology
1270-9638 (ISSN)
Vol. 153 109465INnoVative dEsign of iNstalled airframe componenTs for aircraft nOise Reduction - INVENTOR
European Commission (EC) (EC/H2020/860538), 2020-05-01 -- 2024-04-30.
Driving Forces
Sustainable development
Areas of Advance
Transport
Subject Categories
Applied Mechanics
Fluid Mechanics and Acoustics
DOI
10.1016/j.ast.2024.109465