Ofertes treballs fi d'estudis

Títol: Study of Near-Stall Flow Behaviour in a Compressor Cascade

Director/a: Ventosa Molina, Jordi

Email del professor/a: jordi.ventosa-molina@upc.edu

Departament del professor/a: 724-MMT

• 2010 - GRAU EN ENGINYERIA EN TECNOLOGIES AEROESPACIALS
• 2010 - GRAU EN ENGINYERIA EN VEHICLES AEROESPACIALS
• 2014 - MÀSTER UNIVERSITARI EN ENGINYERIA AERONÀUTICA
• 2016 - MÀSTER UNIVERSITARI EN ENGINYERIA ESPACIAL I AERONÀUTICA

Identificador de l'oferta: 205-06444

Modalitat: Universitat

Possibilitat de beca/finançament: No

Paraules clau:

Descripció:

The aerodynamic behavior of axial compressors near stall is one of the most critical aspects governing the stability, efficiency, and operability of gas turbines. As stall is approached, the flow becomes highly three-dimensional and unsteady, with large separation regions, strong secondary-flow structures, and intense turbulence amplification. These effects increase losses and can trigger rotating stall or surge, directly limiting compressor performance. Understanding the flow physics in this regime is therefore essential for improving modern gas turbine design. High-fidelity simulations provide unprecedented insight into these complex mechanisms. However, Wall-Resolved LES is prohibitively expensive at the Reynolds numbers of compressor cascades. Wall-Modelled LES (WMLES) allows capturing the large energetic structures and the onset of separation at a fraction of the cost while retaining the essential turbulent dynamics, making it a key tool in compressor aerodynamics research. Building upon the methodology used in high-fidelity cascade studies from previous thesis topics, this project will focus on performing WMLES of a compressor cascade operating close to stall. The student will generate and assess a suitable computational grid for WMLES, run simulations, and analyse key flow features such as profile wake, and secondary-flows, in particular, the tip leakage flow and the corner separation.

Tasques a realitzar / Característiques:

1. Literature review on near-stall aerodynamics, separation mechanisms, and secondary flows in axial compressors. 2. Study of Wall-Modelled LES approaches for turbomachinery applications, including their assumptions, limitations, and typical performance. 3. Generation of a WMLES-suitable computational mesh, including boundary-layer grid design, grid-sensitivity considerations, and domain setup. 4. WMLES of a compressor cascade near stall. 5. Flow-field analysis, focusing on secondary-flow structures and loss mechanisms.

Tema: ENGINYERIA AERONÀUTICA

Tipus: Estudi

Càrrega de treball:

300 h GRETA / MUEA - 600 h GREVA - 350 h MASE

Requisits:

Fundamentals of gas turbines, gas dynamics, and fluid mechanics. Basic knowledge of programming and scripting, preferably Python.

Temàtica ambiental: No

Confidencial (informatiu): No

Ambit de cooperació: No

Publicació: 15/12/2025

Caducitat: 15/12/2026