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Experimental Investigation on the Influence of Liner Non-Uniformities onPrevailing Modes

机译：衬垫非均匀性对预处理模式影响的实验研究

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From the in-flight measured circumferential modal spectra of the Rolls-Royce Tay650 engine mounted on the Fokker 100, it was found that the sound field propagating upstream in the inlet is strongly modulated by intercostal hard-walled strips in the lined area, the non-cylindrical geometry of the duct, and the non-axisymmetric flow velocity distribution. To study the effect of the modulation of the acoustic field by the hard-walled strips separately, and experimental program in the NLR spinning mode synthesizer was carried out. In the first place, the effect scattering of modes of low circumferential order in the absence of flow was studied using an array of loudspeakers as noise source. Sound was generated in the frequency range from 400 Hz to 3000 Hz. The target circumferential mode numbers ranged from 0 to 3.

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