Fuel atomization by flashing of a volatile liquid in a liquid jet
- Ben-Gurion Univ. of the Negev, Beersheba (Israel)
Flash boiling occurs when a liquid which initially is in a subcooled state, rapidly depressurized to a pressure sufficiently below saturation pressure to initiate a rapid boiling process. This phenomenon can be applied to improve fuel atomization in spark-ignition engines. In the present work, the characteristics of the generated spray were investigated experimentally. This is in order to establish a designer guideline, for this high potential type of fuel injectors. The following conclusions have been derived: (1) a typical droplets Sauter mean diameter in the range of 20--40 {micro}m can easily be achieved with the present simple fuel injection system; (2) the SMD decreases with the increasing in the mole fraction of the propellant; at high pressure however (high propellant content), the SMD is less and less affected; (3) the SMD and the droplets` uniformity are independent of the orifices` size; (4) the SMD increases with the axial distance; (5) large size droplets may be generated at the periphery of the spray cone due to imperfections at the discharge orifice; (6) a simple and useful analytical expression which is based on energy balance principles demonstrates a good and practical correlation between the spray SMD and the operation conditions, as follows: SMD = [(1{minus}y)/y][6s/EdRT ln (P{sub i}/P{sub o})] where y is the mass fraction of the propellant, E, process efficiency, s, surface tension, d, density of the liquid to be dispersed, R, gas constant, T ambient temperature and P pressure.
- OSTI ID:
- 282505
- Report Number(s):
- CONF-960204-; ISBN 1-56091-781-4; TRN: IM9638%%303
- Resource Relation:
- Conference: International congress and exposition of the Society of Automotive Engineers (SAE), Detroit, MI (United States), 26-29 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Analyzing fuel systems technology for fuel economy and emissions; PB: 181 p.
- Country of Publication:
- United States
- Language:
- English
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