Post-doctorant : Challenging The Urans Aerodynamics

Il y a 4 mois

Lyon, France Centrale Innovation Temps plein

**Framework**:
This thesis project is a part of the European project Clean Aviation HE-ART (**H**ybrid **E**lectric propulsion system for regional **A**i**R**craf**T**). The objective of HE-ART is to research and prepare a flight test of a Hybrid-Electric Regional Aircraft. Hybrid-electric propulsion is a significant challenge for the successful realization of the Hybrid-Electric Regional aircraft (HER) with a targeted fuel burn reduction of at least 50% at aircraft level. This thesis work on the propulsive system in particular to contribute to developing an ultra-efficient turboprop thermal engine.

**Subject**:
Modern compressor design relies intensively on numerical simulations. In the past decades,

CFD has increased flow dynamic knowledge and compressor performances. In the same time, the compressor geometry has become more complex and the impact of technological effects has gained in relative importance. In this context, even more advanced numerical technique for design has to be developed and validated. As such, URANS simulation is a key part in the prediction of the blades loading and its fluctuation in the successive rows.

A first step of the work is to establish a reference case with the URANS industrial state of the art methodology, including solvers setup and fluid domain definition. The next step is to challenge this prediction representativity by adding some ingredients, starting with the backface cavity. This cavity is necessary to allow the rotor displacement. It is connected with the compressor main flow through a small gap at the rotor trailing edge. Standard industrial

simulations do not include this feature. With new enhanced simulations, various topics will be investigated:

- The azimuthal organization of the flow inside the cavity, which can generate an additional

aerodynamic excitation on the rotor.
- The interaction of the cavity leakage flow with the compressor main flow, which can affect

the fluctuations in time and space of aerodynamic features already predicted inside the rotor

and diffuser.
- The pressure fluctuations inside the back-face cavity, which are affecting both previously

pointed mechanisms.

**Knowledge and Skills**:
**Related publication**:

- _Unsteady Analysis of a Pulsating Alternate Flow Pattern in a Radial Vaned Diffuser. _Nicolas Poujol, M. Buisson, P. Duquesne, I. Trébinjac. International Journal of Turbomachinery, Propulsion and Power (2022). DOI 10.3390/ijtpp7030023
- _Effects of inlet guide vanes on the performance and stability of an aeronautical centrifugal compressor._ Nicolas Poujol, I. Trébinjac, P. Duquesne. Journal of Turbomachinery (2021). DOI 10.1115/1.4050944.

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