Prediction of BPF tones emitted by the inlet of an aero-engine model using in-duct angular mode spectrum measurements

G. Reboul 1 C. Polacsek 1 G. Billonnet 1 J.M. Roux 2
1 Chatillon - ONERA - The French Aerospace Lab
2 SNECMA Villaroche [Moissy-Cramayel]
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 data exhibit significant variations of noise level in the azimuthal direction proving that correlation effect between modes seems to be not negligible for tonal noise, the hypothesis of incoherent modes inducing axisymmetric directivities allow to compare reasonably well with measured data averaged azimuthally. Comparisons between theoretical and numerical predictions confirm the practical interest of using simplified analytical methods even if clear improvement are provided by more complex and time consuming methods like CAA. Especially, for polar angles between 20° and 70°, a very good agreement is obtained with a maximum discrepancy of 0.7 dB on overall sound pressure level for the three first tones.
Keywords : TURBOFAN NOISE AEROACOUSTIC CAA ANALYTIC MODEL SABRINA V0 MODE MEASUREMENT HETEROGENEOUS STATOR
Type de document :
Communication dans un congrès
20th AIAA/CEAS Aeroacoustics Conference, Jun 2014, ATLANTA, United States
Liste complète des métadonnées

Littérature citée [6 références]  Voir  Masquer  Télécharger
https://hal-onera.archives-ouvertes.fr/hal-01067826
Contributeur : Véronique Soullier <>
Soumis le : mercredi 24 septembre 2014 - 10:54:31
Dernière modification le : jeudi 15 novembre 2018 - 08:38:59
Document(s) archivé(s) le : vendredi 14 avril 2017 - 14:21:04

Fichier

DSNA14039.1410353794.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : hal-01067826, version 1

Collections

ONERA

Citation

G. Reboul, C. Polacsek, G. Billonnet, J.M. Roux. Prediction of BPF tones emitted by the inlet of an aero-engine model using in-duct angular mode spectrum measurements. 20th AIAA/CEAS Aeroacoustics Conference, Jun 2014, ATLANTA, United States. 〈hal-01067826〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

213

Téléchargements de fichiers

319

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD