24-066 Atomization of a Swirled Liquid Jet By An
Il y a 2 mois
Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Propulsion
**Mission**:
In the first phase, we propose to study the destabilization of a swirled liquid jet by a fast air stream (coaxial injector) and the ensuing spray formation in conditions of high Reynolds and Weber numbers at LEGI. The experiments will be carried out by the Ph.D. student under the supervision of N. Machicoane, an expert in liquid atomization (Kaczmarek et al. IJMF 2022, Machicoane et al. IJMF 2020), with solid expertise in the experimental characterization of sprays and swirled atomization. The first aim of these experiments will be to characterize the physics of atomization in these conditions: it has been shown recently that three destabilizing mechanisms competed in typical atomization conditions (Matas et al. JFM 2018). Among these, the mechanism controlling destabilization in the LOX/CH4 case in the presence of swirl remains undetermined. This question is crucial since only knowing which physical process controls fragmentation can tell which dimensionless number ultimately pilots spray formation and droplet size: is it the gas-to-liquid kinetic energy ratio? The Reynolds? The Weber? The injector geometry via the impact of jet confinement (especially in the presence of a recess between the oxidizer post and the injection plane)? Several geometry variations will be implemented after thoroughly probing the parameter space in the available geometry. Their effects on spray formation processes will be characterized in regions of interest in the parameter space. In addition, modeling efforts will be carried out with the help of/in collaboration with J-P. Matas (LMFA) a recognized expert on jet atomization (Matas JFM 2015) who is already familiar with swirled injection (Matas et al. Phys. Fluids 2013).
The cryogenic spray will ultimately be characterized by advanced experimental methods: Phase Doppler anemometry, optical fiber probes, and holography, with which the present partners are familiar. Finally, in high-speed conditions for large swirl numbers, the expected very optically dense nature of the two-phase flow at the atomizer exit will be tackled using Synchrotron X-ray high-speed imaging (Machicoane et al. IJMF 2019). The combination of experimental methods and the joint skills of the involved consortium will allow for the study of the complete picture of spray formation processes.
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**Profil**:
Hydrodynamics, nonlinear physics, experimental physics
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