Comptes Rendus
Combustion, flow and spray dynamics for aerospace propulsion
Experimental investigation of explosive vaporization of C6F14
Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 88-99.

Depressurization experiments were conducted with C6F14 for superheats between 5 °C and 90 °C in order to determine how the drop characteristics evolve with the thermodynamic disequilibrium. High-speed imaging indicates that flashing is predominant and leads to very dense sprays. Phase Doppler Interferometer (PDI) was adapted to these optically thick conditions and its ability to provide unbiased velocity and size distributions was carefully checked (even though the flux was underestimated). Experiments show that, for initial superheats above 40 °C, the mean drop velocity linearly increases with the initial superheat while the mean drop diameter remains nearly constant. Such behaviors, not reported in the literature, are tentatively related with a front boiling process in which the drop velocity is driven by the vapor velocity while the drop size is controlled by bubbles exploding at the front. In addition, phase detection optical probes used in combination with PDI data provided number density flux measurements. Global vaporization rates deduced from these local data happen to be fairly consistent with alternate techniques, and the vapor flux exhibits a somewhat weak increase with the superheat.

Published online:
DOI: 10.1016/j.crme.2012.10.008
Keywords: Flashing, Explosive vaporization, Sudden depressurization, Spray, Superheat, Drop size and velocity, Vaporization flux, PDI, Optical probe

Clélia Desnous 1; Alain Cartellier 1; Nicolas Meyers 2

1 LEGI-CNRS/Grenoble Université, BP 53, 38041 Grenoble, France
2 SNECMA Vernon, forêt de Vernon, BP 802, 27298 Vernon, France
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Clélia Desnous; Alain Cartellier; Nicolas Meyers. Experimental investigation of explosive vaporization of C6F14. Comptes Rendus. Mécanique, Volume 341 (2013) no. 1-2, pp. 88-99. doi : 10.1016/j.crme.2012.10.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.10.008/

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