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An Experimental and Analytical Study of Flash-Boiling Fuel Injection
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1983 by SAE International in United States
Annotation ability available
Flash-boiling fuel injection is obtained by preheating liquid fuel within the injector so that the sudden decrease of pressure during injection causes rapid boiling of the fuel. Rapid expansion of the vapor phase may then atomize the liquid jet.
Two distinct types of flash atomization were observed experimentally. First, at relatively low fuel temperatures the liquid jet remains intact for a short period after leaving the nozzle, then suddenly breaks up when rapid bubble growth begins. Second, at higher fuel temperatures, flash boiling within the injector orifice produces an underexpanded, compressible, two-phase flow. Sudden expansion immediately upon leaving the orifice yields large spray cone angles.
An analytical model of vapor-bubble growth was applied to enhance understanding of the flash-injection process. Calculated time scales for bubble growth and delay times were found to be consistent with the above two flashing regimes at both low and high fuel preheat temperatures. Also an unfavorable trend toward suppressed bubble growth with increasing injection pressure was calculated.
|Journal Article||A Computational Study of Flashing Flow in Fuel Injector Nozzles|
|Technical Paper||Flash Boiling Effects on the Development of Gasoline Direct-Injection Engine Sprays|
CitationOza, R. and Sinnamon, J., "An Experimental and Analytical Study of Flash-Boiling Fuel Injection," SAE Technical Paper 830590, 1983, https://doi.org/10.4271/830590.
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