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 ONERA - The French Aerospace Lab [Châtillon]
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
Document type :
Conference papers
Complete list of metadatas

Cited literature [6 references]  Display  Hide  Download
https://hal-onera.archives-ouvertes.fr/hal-01067826
Contributor : Véronique Soullier <>
Submitted on : Wednesday, September 24, 2014 - 10:54:31 AM
Last modification on : Tuesday, March 26, 2019 - 2:24:03 PM
Long-term archiving on : Friday, April 14, 2017 - 2:21:04 PM

File

DSNA14039.1410353794.pdf
Files produced by the author(s)

Identifiers

  • 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⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

309

Files downloads

425

Contact

CCSD