Curvature-surface analysis to characterize the early stage of the atomization process of the pressure swirl injector
Résumé
This work aims to characterize the spray in near-field regions up to droplet formation. For this purpose several approaches both numeric and experimental are analyse. The analysis of curvature distribution allowing to characterize the spray before the final formation of droplet was first applied by Palanti (Palanti et al. 2022) within the context of Computational Fluid Dynamics (CFD) using the Volume of Fluid (VOF) method to model the multiphase flow. In the present study, this analysis is applied to the nheptane hollow cone spray from numerical simulations and experimental images based on two-photon laser-induced fluorescence (2p-LIF) technique. It uses the curvature and surface interface between liquid and gas to achieve droplet size distribution (DSD) despite not having a fully formed spray. In other words, it allows characterizing the spray from nonspherical liquid structures. In addition to the droplet size, the size-velocity distribution is also estimated from an adapted technique (Ferrando et al. 2021). The results obtained from the curvature-surface analysis are compared with those obtained from the Phase Doppler Anemometry (PDA) measurements. The numerically obtained DSD is in good agreement with PDA measurements. The numerical results showed a slightly higher droplet velocity than the measured values. Further, the DSD obtained from 2p-LIF curvature-surface analysis is also compared with numerical and PDA results.
| Origine | Fichiers produits par l'(les) auteur(s) |
|---|---|
| Licence |