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Atomization and Sprays

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ISSN Print: 1044-5110
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Atomization and Sprays


12 pages

IN SITU OBSERVATION OF MICROEXPLOSION OF EMULSION DROPLETS IN SPRAY FLAMES

Yukio Mizutani
Department of Mechanical Engineering, School of Science and Engineering, Kinki University, Osaka, Japan
Masaaki Muraoka
Graduate School of Engineering, Kinki University, Osaka, Japan

ABSTRACT

Graduate School of Engineering, Kinki University, Osaka, Japan A schlieren optical system with a deep-cut-type knife edge was adopted for back-light illumination, and the droplet behavior was recorded by a high-speed video camera. Microexplosion of emulsified fuel droplets was successfully documented using this method. Further, the local frequency of explosion occurrence was estimated in open spray flames of water-in-oil-type emulsions formed using an airassist atomizer with a ring pilot burner. Almost all the patterns of microexplosion observed for single fiber-suspended emulsion droplets, usually a few millimeters or more in diameter, were also observed in the present spray flames. The frequency of microexplosion occurrence increased if the water fraction in the emulsion was raised or the emulsion-stirring period was elongated. It appeared that this frequency increased suddenly from 90 mm above the fuel injection nozzle. Since, however, the effect of water addition was most prominent in the upstream region, it was highly probable that microexplosion started somewhere more upstream, though unobservable due to the experimental difficulty resulting from the excessive density of droplets there.