Aerodynamic and acoustic analysis of the tip-leakage flow on a single airfoil
Jury :
- Pr. Gérard BOIS / LML, Arts et Métiers ParisTech / Rapporteur
- Pr. Nicolas BINDER / ISAE-SupAéro / Rapporteur
- Pr. Régiane FORTES-PATELLA / LEGI, Grenoble INP / Examinateur
- Pr. Lipeng LU / Université Beihang / Examinateur
- Dr. Laurence VION / Safran Aircraft Engines / Examinateur
- Dr. Jérôme BOUDET / LMFA, École centrale de Lyon / Co-directeur de these
- Pr. Marc C. JACOB / ISAE-SupAéro / Directeur de these
Abstract :
This work focuses on the study of the tip-leakage flow in a single-airfoil configuration, from both the aerodynamic and acoustic points of views. The tip-leakage flow is a very important flow feature in the turbomachines. It is extremely complex for its three-dimensional unsteady nature, and its existence leads to many unfavourable effects, such as aerodynamic performance losses and noise emissions. In order to improve the understanding of the tip-leakage flow and its associated broadband noise, a research campaign in the frame of the Sino-French project AXIOOM has been carried out at LMFA. In the current study, experimental and numerical results are analysed systematically and thoroughly. A multi-vortex system with an intense tip-leakage vortex is observed. The various analyses of the flow characteristics show a good agreement between the experiment and the ZLES in the blade tip region. A specific attention is paid on the oscillatory motion of the tip-leakage vortex, and the wandering amplitude is evaluated using the time-resolved PIV measurements. The dynamic response of the tip-leakage vortex is also studied with URANS at selected frequencies. Finally, efforts are put on the broadband noise modelling and prediction based on the experimental and numerical near-field data.
