20th AIAA/CEAS Aeroacoustics Conference 2014
DOI: 10.2514/6.2014-3105
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Prediction of BPF tones emitted by the inlet of an aero-engine model using in-duct angular mode spectrum measurements

Abstract: The goal of this study was to realize predictions of tonal noise generated by a SNECMA turbofan mock up with a heterogeneous stator and radiated from the inlet using as input a modal decomposition made in the inlet duct wall. A numerical approach based on the CAA (Computational AeroAcoustics) code sAbrinA.V0 with an equivalent source term recently implemented is used as well as an analytical methodology using a Wiener-Hopf technique and an uniform flow assumption. Even if directivities from raw experimental da… Show more

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Cited by 5 publications
(2 citation statements)
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“…The focus is now put on the far-field acoustic power, which can differ from the in-duct acoustic power if the dominant modes have a low radiation efficiency or if some cut-off modes reach the inlet plane with a significant level [24]. The Kirchhoff's integral method is applied in the frequency-domain to get the far-field pressure at BPFn from the pressure field on a source surface S at the same frequency [25,26]. One should note that solving the equation of Ffowcs Williams…”
Section: B Far-field Acoustic Powermentioning
confidence: 99%
“…The focus is now put on the far-field acoustic power, which can differ from the in-duct acoustic power if the dominant modes have a low radiation efficiency or if some cut-off modes reach the inlet plane with a significant level [24]. The Kirchhoff's integral method is applied in the frequency-domain to get the far-field pressure at BPFn from the pressure field on a source surface S at the same frequency [25,26]. One should note that solving the equation of Ffowcs Williams…”
Section: B Far-field Acoustic Powermentioning
confidence: 99%
“…12 for the first three tones of the baseline configuration. Modes are assumed to be fully uncorrelated as usually done to better fit experimental data issued from aero-engine test rigs [20]. 3D directivity maps (Fig.…”
Section: Fig 11 Baseline Vs Distortion Spl Spectra At the Intake Camentioning
confidence: 99%