Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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2007, Volume17

Issue 2

98 pages

DOI: 10.1615/AtomizSpr.v17.i2

Issue price - $109.00

Julian T. Kashdan
I.F.P., Rueil-Malmaison, France

Holger Lienemann
Department of Mechanical Engineering, Imperial College London, London, UK

John S. Shrimpton
Department of Mechanical Engineering, Imperial College of Science, Technology & Medicine, London, United Kingdom

This article describes a one-to-one comparison of spray performance for a single-fluid high-pressure swirl injection system (PSA) and a dual-fluid, air-assisted injection system (AAA) based on high-resolution CCD images and phase Doppler anemometer measurements. Both atomizer concepts are used in direct-injection spark-ignition (DISI) engine applications, and the present experiments were carried out using original engine hardware. Spray characterization was obtained in constant-volume chambers at ambient conditions corresponding to typical injection windows in DISI engines. The temporal and spatial evolution of spray pattern, mean droplet size, and droplet velocity were considered as important parameters. At atmospheric gas conditions, the rate of axial penetration was similar for both sprays, but a fourfold increase in gas density resulted in a reduction of ∼50% and ∼25% for the AAA and PSA, respectively. A higher level of droplet arithmetic mean diameter (D₁₀) was generally observed for both sprays at elevated gas densities, and a correlation factor was introduced to link the space-averaged D10 and the ambient gas density.

DOI: 10.1615/AtomizSpr.v17.i2.20 Download article, 123-151 pages

Article price - $35.00

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