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在国际上关于LAGOON(LAnding Gear nOise database for civil aviation authority validatiON)起落架的研究中发现,机轮空腔噪声是一个重要的噪声源,为了研究其产生机理,本文以LAGOON模型的1/2缩比模型为试验对象,在北京航空航天大学D5气动声学风洞中进行试验。已有LAGOON模型数值模拟结果表明,过顶和侧边噪声中的纯音噪声与机轮空腔息息相关。并在LAGOON缩比模型试验结果的基础上,利用空腔填充的方法重点展开机轮空腔发声机理研究。通过对比不同填充方式的模型噪声试验,结合已有的半经验公式和前人成果,验证了空腔噪声中纯音噪声的产生机理与机轮空腔的声学共振现象有密切关系。
In the international research on the landing gear of LAGOON (LAnding Gear nOise database for civil aviation authority validatiON), it is found that the wheel cavity noise is an important noise source. In order to study its generation mechanism, The model was tested in a D5 aerodynamic wind tunnel at Beijing University of Aeronautics and Astronautics. The numerical simulation results of the LAGOON model show that the pure noise in overhead and side noise is closely related to the wheel cavity. On the basis of the LAGOON reduction model test results, the mechanism of cavity sound emission is studied emphatically by means of cavity filling. By comparing the model noise tests with different filling methods and combining the existing semi-empirical formulas and previous results, it is verified that the mechanism of pure noise in cavity noise is closely related to the acoustic resonance phenomenon in the wheel cavity.