飞机起落架气动噪声特性仿真与试验

Abstract

Abstract: Simulation analysis and experimental research are performed on the aeroacoustic noise characteristics of an aircraft nose landing gear in this paper. At the flight speed during the approach phase, the flow field of an aircraft nose landing gear is produced by means of detached eddy simulation(DES). The source strength and location are determined though the vortex sound theory. Meanwhile, the acoustic field radiated from different model parts or assembled parts are calculated via FW-H(Flowcs-Williams/Hawkings) equation. The noise mechanism, frequency spectra and the directivity characteristics are subsequently studied, and the contribution of each part is assessed. The acoustic field radiated from the assembled parts of the wheel and bogie is measured in an aeroacoustic wind tunnel. The noise spectra are evaluated by microphones. A comparison shows that the simulation results agree well with the experiment results under the acoustic far field condition. The results indicate that the landing gear noise is broadband noise, which is mainly generated by flow separation off the bluff body and superimposed by tonal noise. The sources with the biggest strength are on the solid surface of each part. The wheel is the largest contributor and the strut is the least contributor to the landing gear noise. The noise radiation directivities of each part and the whole model are similar in possessing dipole characteristics. The sound pressure level calculated from the porous surface is about 5 dB greater than that calculated from the solid surface. The results can provide some reference for low noise landing gear design.

Key words: landing gear noise, acoustic measurement, computational aeroacoustics, vortex sound theory, acoustic analogy

CLC Number:

V211.7

LONG Shuangli, NIE Hong, XUE Caijun, XU Xin. Simulation and Experiment on Aeroacoustic Noise Characteristics of Aircraft Landing Gear[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, (6): 1002-1013.

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Simulation and Experiment on Aeroacoustic Noise Characteristics of Aircraft Landing Gear

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