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Atomization and Sprays
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ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v3.i2.10
pages 125-135

SPARK-IGNITED SPHERICAL FLAMES PROPAGATING IN A SUSPENDED DROPLET CLOUD

Yukio Mizutani
Department of Mechanical Engineering, School of Science and Engineering, Kinki University, Osaka, Japan
Kazuyoshi Nakabe
Department of Mechanical Engineering and Science, Kyoto University; Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Manabu Fuchihata
Mazda Motor Corporation, Hiroshima, Japan
Fumiteru Akamatsu
Department of Mechanical Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 5650871, Japan
Masataka Zaizen
Department of Mechanical Engineering, Faculty of Engineering, Osaka, University, Suita, Osaka 565, Japan
Salah Hassan El-Emam
Mansoura University, El-Mansoura, Egypt

要約

A droplet suspension of liquid fuel produced by an ultrasonic atomizer was ignited using an electric spark. The Sauter mean diameter (SMD) of the droplet suspension was 57μm to 66 μm for fuel injection rates of 2.13 cm3/min to 4.44 cm3/min, respectively. The droplet distribution for any fuel injection rate included a negligible amount of droplets smaller than 20 μm or larger than 100 μm in diameter. The flame ball propagating outward was monitored by observing light emission from OH- and C2-radical bands using photomultipliers, a highly sensitive CCD camera, and a high-speed camera. Thereby, the mechanism of flame propagation and the complicated structure of spray flames were observed. It was found that a nonluminous flame was propagating continuously through a gas-phase mixture, followed by luminous flamelets, such that a number of small-scale droplet clusters with luminous emissions appeared randomly and discontinuously behind the flame front propagating in a premixed combustion mode. This result shows that the group structure of spray flames is not simple.


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