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Investigation of the liquid accumulation characteristics in planar prefilming airblast atomization [in press]

Chaussonnet, Geoffroy; Laroche, Thomas; Lieber, Christian; Holz, Simon; Koch, Rainer; Bauer, Hans-Joerg

The phenomenon of prefilming airblast atomization is investigated by means of shadowgraphy. The focus is on the liquid accumulation, which is attached to the trailing edge in the wake region of the prefilmer. The prefilmer is planar to facilitate the measurements, and the trailing edge thickness is 230 µm. The investigated liquid is a kerosene surrogate (Shellsol D70). The operating parameters are varied with a bulk gas velocity ranging from 20 to 100 m/s and a surface volumetric liquid flow rate ranging from 20 to 120 mm2/s. In order to statistically investigate the liquid accumulation, it is virtually split into several atomizing cells. Each cell consists of a single ligament and a surrounding liquid part. Different characteristic lengths of the atomization cells are extracted by a in-house post-process tool. The distribution of these length scales are well described by a gamma function, whose scale parameter $m$ is proportional to a Weber number based on the trailing edge thickness (We_te). However, it is observed that the parameter $m$ also varies with the liquid flow rate, independently of We_te. A two-step mechanism is propose ... mehr

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Postprint §
DOI: 10.5445/IR/1000084438
Frei zugänglich ab 02.08.2019
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Jahr 2018
Sprache Englisch
Identifikator urn:nbn:de:swb:90-844389
KITopen-ID: 1000084438
HGF-Programm 34.14.02 (POF III, LK 01)
Erschienen in Proceedings of the 14th International Conference on Liquid Atomization & Spray Systems (ICLASS2018), Chicago, IL, July 22-26, 2018
Vorab online veröffentlicht am 01.08.2018
Schlagworte prefilming airblast atomization, shadowgraphy measurement, liquid accumulation
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