PhD Defense: ANTOINE MOUZE-MORNETTAS￼
“Modelling and reduction of the LOx-Methane chemical kinetics for rocket engine applications”
As the space market becomes increasingly competitive, reusable launch vehicles are seen as a key technology to significantly reduce the cost of access to orbit. As it represents the best cost-performance compromise, methane is considered as a solution for future reusable engines. However, the operating conditions of rocket engines are extreme in terms of temperature and pressure, hence prohibitive for most existing experimental devices. Thus, there is a fundamental lack of knowledge about the kinetics of methane oxycombustion.
To obtain a valid kinetic model, an experimental database of flame velocity representative of the application conditions is built using the OPTIPRIME isochoric combustion chamber developed at ICARE (CNRS). A wide range of equivalence ratios, pressure and temperature never explored before for these mixtures is constructed. A selection of different recent mechanisms is then compared to the experimental results. The mechanism with the smallest deviation from experiment (POLIMI C1-C3) is used as a starting point for an optimization process on the experimental database using the OPTISMOKE++ tool. Hence, a kinetic model adapted to CH4/O2 combustion under rocket engine conditions is obtained. Finally, the model is tested in a high-fidelity 3D LES simulation of a single-engine rocket configuration at 100 bar (REST HF-10) with the AVBP code developed at CERFACS. The obtained results are compared to existing models. The main characteristics of the flame are recovered but with a more complex structure, thus underlining the interest of an optimized chemistry.
|Frédérique BATTIN-LECLERC||CNRS LRGP, Université de Lorraine||Referee|
|Guillaume RIBERT||CNRS CORIA, INSA Rouen Normandie||Referee|
|Aurélie NICOLE||ONERA, Palaiseau||Jury member|
|Annafederica URBANO||ISAE SUPAERO, Toulouse||Jury member|
|Guillaume DAYMA||CNRS ICARE, Université d’Orléans||Jury member|
|Florian MONNIER||ArianeGroup, Site de Vernon||Invited member|
|Miguel MARTIN-BENITO||CNES, Paris Daumesnil||Invited member, Industrial advisor|
|Fabien HALTER||CNRS ICARE, Université d’Orléans||Advisor|
|Bénédicte CUENOT||CERFACS, Toulouse||Advisor|