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Stalilization and dynamics of H2/air flames in swirling flows for aerospace applications

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Français - Anglais

Date Limite Candidature : jeudi 4 mars 2021

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General information

Reference : UMR5502-THISCH-002
Workplace : TOULOUSE
Date of publication : Thursday, February 11, 2021
Scientific Responsible name : Thierry Schuller
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 4 October 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Objective: The PhD program takes place within the ERC SCIROCCO project (https://cerfacs.fr/scirocco/). It aims at unveiling the physical mechanisms of this new mode of flame stabilization with combined experiments and numerical flow simulations on the MIRADAS test bench at IMFT laboratory. The general objective is to develop over the 3-years PhD program a proof of concept based on successive improvements of the original burner design that complies to specifications of future aeronautical engines powered by hydrogen.
Roadmap : The program starts by an analysis of the scientific literature on the different current strategies for H2 injection in gas turbine technologies. The development on the new burner relies on the MIRADAS test rig from IMFT. Based on an original injector design, the operational map will be characterized to identify regimes and factors limiting its performances. These regimes will be analyzed with the help of optical diagnostics focusing on flame imaging in the visible and UV ranges, characterization of the flow field (PIV, LDV) under cold and hot flow conditions, completed by temperature and emission measurements. Results will be analyzed in light of combustion theory and with simulation tools available at the laboratory.
The second objective is to provide data for numerical flow simulations of these configurations. Strong interactions are expected with the PhD students in the laboratory working on numerical simulations of these configurations with the AVBP flow solver. Some of these simulations will be carried out by the candidate itself. Finally, a particular focus will be placed on dynamic issues that may develop with these injectors with the aim at improving the burner performance to extend the lean blow off limits and reduce its sensitivity to thermo-acoustic instabilities. An implication of the candidate to different social and structures of the combustion group and IMFT is also expected.

Work Context

Context : Injecting and burning hydrogen in place of kerosene into aircraft engines requires a complete revision of the engine design. Several disruptive technologies are being studied by manufacturers and combustion laboratories to develop gas turbines operating with hydrogen. IMFT laboratory has developed a hydrogen injection strategy that stabilizes H2/air flames over a wide range of operations, under safe conditions and with reduced nitrogen oxide emissions. The PhD work will focus on this technology in close links with SAFRAN engineers and many high level laboratories worldwide.

Constraints and risks

Work in a large team (15 persons). Collaboration with CERFACS for simulations

Additional Information

Work in a high level team with two ERC advanced grants in the last 6 years:
intecocis.inp-toulouse.fr
https://cerfacs.fr/scirocco/

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