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Atomization and Sprays

Impact factor: 1.235

ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2017019706
pages 611-628

EXPERIMENTAL INVESTIGATION ON FUEL FILM FORMATION BY SPRAY IMPINGEMENT ON FLAT WALLS WITH DIFFERENT SURFACE ROUGHNESS

Hongliang Luo
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
Shintaro Uchitomi
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
Keiya Nishida
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
Youichi Ogata
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima, 739-8527, Japan
Wu Zhang
Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670, Japan
Tatsuya Fujikawa
Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670, Japan

ABSTRACT

The impingement of fuel sprays on the wall in direct-injection spark-ignition (DISI) engines affects mixture preparation, combustion performance, and pollutant emissions. A better understanding of the fuel film behaviors is required to reduce exhaust emissions and fuel consumption. In this work, the experimental results of fuel spray impinging behaviors and adhered fuel film formation were measured by Mie scattering and refractive index matching (RIM) methods. The spray tip penetration and impinging spray height were discussed; the mass, area, and thickness of the fuel film were investigated under different conditions, including wall surface roughness, injection pressure, and ambient pressure. The results show that an increase in the wall roughness decreases the spray tip penetration, increases the impinging spray height, and decreases the uniformity of the fuel film distribution. An increase in ambient pressure results in a more uniform distribution of the fuel film.