25th AIAA/CEAS Aeroacoustics Conference 2019
DOI: 10.2514/6.2019-2525
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Radial mode breakdown of the ACAT1 fan broadband noise generation in the bypass duct using a sparse sensor array

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Cited by 14 publications
(16 citation statements)
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“…The acoustic calculations are performed at approach (APP) operating point (OP), while the aerodynamic performances are investigated in priority at the aerodynamic design point (ADP). The aerodynamic and acoustic databases were obtained in a test campaign [19][20] conducted in 2018 at the Universal Fan Facility for 5…”
Section: Fan Stage and Experimental Set-upmentioning
confidence: 99%
See 1 more Smart Citation
“…The acoustic calculations are performed at approach (APP) operating point (OP), while the aerodynamic performances are investigated in priority at the aerodynamic design point (ADP). The aerodynamic and acoustic databases were obtained in a test campaign [19][20] conducted in 2018 at the Universal Fan Facility for 5…”
Section: Fan Stage and Experimental Set-upmentioning
confidence: 99%
“…2, bottom), aiming to assess the forward far-field radiation (with a free-field microphone array) and the in-duct sound field, with circumferential (CMD1 and CMD3) and axial (AX1) wall-flush mounted microphone arrays. Experimental BBN spectra were achieved by DLR using advanced signal processing techniques [19][20] . Sound power spectra reported in this paper were obtained from a wavenumber decomposition technique to remove the hydrodynamic fluctuations, which is necessary to capture the sound pressure field, using a duct mode analysis with an equal energy density distribution assumption.…”
Section: Fan Stage and Experimental Set-upmentioning
confidence: 99%
“…The sound power is then computed by assuming an equal energy density distribution between propagating modes of the same frequency bands [13]. The experimental data were first presented by Tapken et al [14]. Further details regarding the acoustic measurements were also discussed by Behn et al [15].…”
Section: Experimental Setup and Used Measurement Datamentioning
confidence: 99%
“…35 The sound power can then be computed by assuming an equal energy density distribution between propagating modes of the same frequency band. 36 The WND data for this fan were shown and discussed in detail by Tapken et al 37 The AMA technique decomposes the signal into its azimuthal mode components using a spatial Fourier transform. The sound power can be computed under the assumptions that radial modes of the same azimuthal order m are incoherent and that all modes have the same propagation direction.…”
Section: Comparison To Experimental Datamentioning
confidence: 99%
“…And as for the WND technique, it is assumed that the amplitudes of radial modes of the same azimuthal mode order have an equal energy distribution. Tapken et al 37 performed a radial mode analysis (RMA) for the ACAT1 fan using the CAAS method. 38 This technique has the advantage that no assumption regarding the energy distribution among mode orders is necessary but no distinction between acoustic and hydrodynamic pressure fluctuations can be made.…”
Section: Comparison To Experimental Datamentioning
confidence: 99%