2D laser diagnostics of liquid methanol for investigation of atomization and vaporization dynamics in a burning spray jet

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:93182

Bazile, R; Stepowski, D ^[1]

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1. Univ. of Rouen, Mont Saint Aignan (France)

Single-shot planar imaging of Raman scattering of liquid methanol, as well as laser-induced fluorescence of dissolved dye, has been used to investigate atomization and vaporization dynamics in the early stages of a burning spray jet. Within the limited dynamic range of the camera, these linear techniques provide signal levels that are locally proportional to the mass of liquid intercepted by the laser sheet, whereas the techniques based on elastic interactions with the spray could not provide quantifiable data in this region of large size dispersion. High-speed 2D maps of the condensed mass held of the initial jet display the dynamic behavior of the structures induced by different regimes of air-blast atomization. The technique has enabled them to obtain planar instantaneous pictures of the liquid phase velocity field in the early development of the burning spray. When a droplet vaporizes, the signal level on its (blue) Raman image scales as its actual volume d{sup 3}, whereas the signal level on its (red) dye fluorescence image scales as its initial volume d{sub 0}{sup 3}, since the mass of dissolved dye does not vaporize. The comparison of the simultaneous images provides useful information on the vaporization dynamics in the burning spray. The data have been obtained in terms of evaporation constant from size reduction of single droplets or in terms of vaporized mass fraction of injected fuel from integrated measurements.

• OSTI ID: 93182
• Report Number(s): CONF-940711--
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
40 CHEMISTRY
ATOMIZATION
COMBUSTION KINETICS
DIAGNOSTIC TECHNIQUES
EVAPORATION
EXPERIMENTAL DATA
FLOW VISUALIZATION
METHANOL
PARTICLE SIZE
RAMAN SPECTROSCOPY
TWO-DIMENSIONAL CALCULATIONS