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- Title
Aerodynamic Noise Simulation of Commercial Aircraft Landing Gear.
- Authors
Long Shuangli; Nie Hong; Xue Caijun; Xu Xin
- Abstract
Aerodynamic noise of a commercial aircraft landing gear component is explored. The flow field around the landing gear is produced using detached eddy simulation (DES). The source information is obtained. The acoustic field radiated from the model is calculated via FW-H equation. The influences of course/fine grid on simulation precision and porous/solid integration surface on noise prediction are evaluated by spectra comparison. Frequency spectra and directivity characteristics are investigated. The results show that DES displays the capability to resolve fine-grained turbulence and exhibits the complex vertical structures. The sound pressure level calculated based on the coarse grid is about 1 dB less than that calculated based on the fine grid when using the solid integration surface. The sound pressure level calculated from the porous surface is 5-7 dB greater than that calculated from the solid surface because of the quadrupole sources in the wake. The noise source is relevant to the vortex shedding behind the model. Noise radiation has obvious directivities.
- Subjects
AERODYNAMIC noise; EDDY currents (Electric); TURBULENCE; SOUND pressure; FREQUENCY spectra; RADIATION
- Publication
Journal of Nanjing University of Aeronautics & Astronautics / Nanjing Hangkong Hangtian Daxue Xuebao, 2012, Vol 44, Issue 6, p786
- ISSN
1005-2615
- Publication type
Article