Etude expérimentale et numérique des écoulements dans un étage de compresseur axial à basse vitesse en régime de fonctionnement instable.

Abstract : The reduction of the environmental impact is nowadays one of the crucial challenges of the aeronautic industry. The quest to lower the consumption of aircrafts has led to more compact and higher loaded engines in general, and especially compressor stages. This leads an increase of the internal flow unsteadiness and to the occurrence of unstable phenomena. The experimental study, performed during this work, concerns the characterization of flows in an axial compressor stage during both the emergence of rotating stall and its stabilized phase, by means of unsteady pressure and velocity measurements. The originality of the work proposed resides in the use and the development of non-standard data processing methods. The wavelets transform reveals to be an interesting tool for the detection of short coherent structures, like the spike-type precursor as well as the instantaneous features of a rotating stall cell. Beside this local approach, different procedures for phase-locked field measurements were developed, according to the specification of each studied phenomenon and the experimental proceedings. Thanks to these methods, it was possible to highlight the pressure field evolution until the development of the rotating stall regime. The alignment of the tip leakage vortex with the rotor inlet section forecasts a spike type stall onset. The comparison between transitional phase and fully developed stall fields conducts to assert that the precursor represent only the embryonic stage of the rotating stall evolution. This approach led to appreciate the complexity of the internal structure of the cell that appears to be the succession of stall propagation phase, zero-loaded high flow rate region and reattachment phase
Complete list of metadatas

Cited literature [32 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-01345795
Contributor : Abes Star <>
Submitted on : Friday, July 15, 2016 - 5:38:34 PM
Last modification on : Friday, May 10, 2019 - 3:14:06 PM

File

VEGLIO.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01345795, version 1

Collections

Citation

Monica Veglio. Etude expérimentale et numérique des écoulements dans un étage de compresseur axial à basse vitesse en régime de fonctionnement instable.. Mécanique des fluides [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2015. Français. ⟨NNT : 2015ENAM0053⟩. ⟨tel-01345795⟩

Share

Metrics

Record views

501

Files downloads

437