Analyse et contrôle des écoulements en compresseur centrifuge avec diffuseur aspiré
type: Dataset
description: The study presented in this manuscript takes place in the context of flow control within tur - bomachinery. Following the demonstration of the effectiveness of the boundary layer suction technique in axial compressors for improving their performance, the present work aims at determining if this same technique may be relevant in radial compressors. Boundary layer suction is then applied on a centrifugal compressor stage, designed and built by Turbomeca, Safran group. The working of the compressor is first analyzed thanks to steady-state and unsteady numerical simulations, performed using the elsA solver developed by Onera, the French Aerospace Laboratory. The turbulence is modeled with the two equations k-l model of Smith. The validity of the numerical results is ensured by comparison with available experimental measurements results: one-dimensional performance coefficients and time-dependent pressure signals. This data were obtained by both Turbomeca, during the characterization of the compressor, and the fluid mechanics laboratory of ISAE, Université de Toulouse, were the compressor is mounted in an experimental test rig dedicated for studying the impeller-diffuser interactions. The detailed analysis of the numerical results reveals the growth of a corner separation within the diffuser between the hub endwall and the vane suction side when the operating point moves toward surge. The precise location and the internal structure of that boundary layer separation are then elucidated thanks to a topological study, which allows to identify the singular points and the separating lines of the skin-friction pattern. In steady-state numerical simulations, the development of that corner separation leads to the stall of the diffuser, which compromises the compressor stage performance and finally the stability of the numerical model. Unsteady numerical simulations results allow to specify the temporal behavior of the corner separation: the extent of the separated zone is modula…
identifier: NNT: 2013ECDL0018
issued: 2026-05-05T20:54:07.281882
language: fr
modified: 2026-05-05T20:54:07.281886
contact point: Organization
  fn: CCSD
keyword: aspiration-de-la-couche-limite
keyword: compresseur-centrifuge
keyword: diffuseur-aspire
keyword: ecoulements
keyword: infoeu-reposemanticsdoctoralthesis
keyword: spiotherengineering-sciences-physicsother
keyword: theses
landing page: https://theses.hal.science/tel-00965080

Analyse et contrôle des écoulements en compresseur centrifuge avec diffuseur aspiré
type: Distribution
format: HTML
issued: 2026-05-05T20:54:07.286921
modified: 2026-05-05T20:54:07.273159
access URL: https://theses.hal.science/tel-00965080

test_moissonnage_selune
type: Agent