Postdoctoral Researcher - Palaiseau, France - ONERA

ONERA

Entreprise vérifiée

Palaiseau, France

il y a 3 semaines

Posté par:

Sophie Dupont

beBee Recruiter

Description

Title :
Data analysis on aluminum combustion in a solid-propellant flame

Keywords
Rocket propulsion, solid propulsion, aluminum, combustion modeling, CFD, data analysis, laser diagnostics, laser-induced fluorescence imaging

Profile and skills required
A PhD degree in fluid dynamics and combustion or an associated field
Knowledge in numerical simulation and data analysis
Strong interest in combustion modelling and image processing.

Ability to interact with researches from different scientific fields:
combustion, CFD, spectroscopy and laser-induced fluorescence imaging, image processing

Presentation of the post-doctoral project, context and objective
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Context_
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Scientific project_

Research work has been underway at ONERA since 2015, leading to the development of combustion models for a single aluminum droplet.

Various numerical approaches have been developed:

first, a 1D configuration with spherical symmetry for steady-state or unsteady calculations; second, a 2D configuration with axial symmetry and an alumina cap.

The latter is realized by implementing detailed models for molecular transport and chemical kinetics [2] in the CEDRE code of ONERA.

Model validation requires experimental data which are sparse in the literature.

The planar laser-induced fluorescence (PLIF) imaging technique applied to Al atom (Al-PLIF) has been developed at ONERA since 2014 thanks to two PhD works [3][4].

It was used at ONERA with a combustion chamber for small solid-propellant samples, which can operate up to 15 bar with optical access.

By this way, the combustion of aluminum droplets in the solid-propellant flame can be studied.

The Al-PLIF technique gives access to instantaneous field of aluminum vapor around the droplet while it burns above the sample surface.

Al-PLIF imaging was coupled with direct visualization for simultaneous analysis of droplet morphology and size.

The high acquisition rate (5 to 10 kHz) enables droplet tracking and generates a large experimental database: a large number of images are acquired for each test under various conditions (solid-propellant compositions, operating pressures).

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Missions_

The postdoctoral work will focus on two areas.

On the one side, numerical simulations of single-droplet combustion will be performed for various droplet sizes for conditions representative of Al-PLIF tests.

These calculations will provide a sensitivity analysis for key parameters such as the kinetic scheme, the gas composition, and the position of the alumina cap.

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References_:

[1] Orlandi O. et al., Aluminium droplets combustion and SRM instabilities, Acta Astronautica, 158, pp , 2019.

[2] Muller M., Modélisation de la combustion de gouttes d'aluminium dans les conditions d'un moteur fusée à propergol solide, Thèse de doctorat, Sorbonne université, 2019.

[4] Chevalier P.H. et al.

, Investigation of aluminum droplet combustion in solid propellant flames:
Al-PLIF experiments and numerical simulation, AIAA Propulsion and Energy 2021 Forum.

Salary: 22,000.00€ - 25,000.00€ per year

Work Location:
One location

Application Deadline: 24/04/2023

Expected Start Date: 02/10/2023