Post-doctoral Taipei 2

Job title:

Post-doctoral Taipei 2

Company:

ISAE Supaéro

Job description

About the program TAIPEI-2:One way of improving the thermal efficiency of aircraft engines is to control the cycle, where combustion iscarried out at a constant volume. Recent results demonstrate the feasibility of such architectures, provided thatthe degradation of efficiency of turbines located downstream is limited. Turbines are generally designed accordingto steady-flow specification, but are here subject to an unsteady or pulsating flow, caused either by the openingof valves or by the presence of shock waves in the annular chambers of RDE. It is therefore essential to ensure asufficiently high level of efficiency for turbines, which operate under such severely unsteady conditions (see figure1). Thus, new physical behaviors are to be understood, and design best practices to adapt.Context and motivations:The project is in direct continuity of long term research conducted at the department, as a cooperation be-tween the fundamental fluid dynamics research team and the turbomachinery and propulsion research team.
It demonstrated that the unsteady environment is an opportunity to promote an instantaneous overactivation of workrecovery. The geometric parameters driving this additional recovery were identified. However, the analysed config-uration is a simplified academic prototype flow.
Both the geometry and the boundary conditions representativelyneed to be improved, to get closer to a realistic situation, integrated in an engine. Also, the operating regime ofthe turbines studied so far remained subsonic. The flow imposed on turbines in RDEs is supersonic.
It is thereforeessential to study the physics associated with this regime, since RDE is the most promising architecture of cvcengines, and to check whether the instant benefit remains present in such a context.
The project therefore aims at:→ improving the representativeness of the boundary conditions→ approximating a RDE-type application, and→ proposing appropriate design rules.This post-doctoral research here proposed will address those three questions.This work must beconducted by means of numerical simulations, which gives access to physics whose characteristic times are verysmall, thus challenging to the experimental approach. A research code, IC3, is developed at the lab in that purpose.Main Objectives:The driving objectives of this research are:

• adapt the unsteady boundary conditions of the simulation domain according to literature results focused

on RDE. Define a numerical setup fit for such simulations;

• perform simulations with shorter time scales, for which a strong interaction between the compression and

expansion phases are expected. Set a parametric exploration to analyse the physics;

• synthesize the key findings in design recommendations for unsteady turbines.

Publication of the findings is expected.Expected profile:The candidate has a PhD in fluid dynamics, or is an experienced engineer, with some recognized expertise in
numerical simulations.Some knowledge in unsteady compressible flows, and/or turbine flows would be appreciated.Remuneration:According to experience and diploma. Minimum value of 2850 euros/month (gross salary).Application ProcessPlease submit a CV and a cover letter by clicking on “APPLY.”ContactsDr. Jérémie Gressier at or Professor Nicolas Binder at .In line with our Corporate Social Responsibility approach, particularly regarding the inclusion and integration of individuals with disabilities, this position is open to all candidates.

Expected salary

€2850 per month

Location

Toulouse

Job date

Wed, 29 Jan 2025 23:51:01 GMT

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