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A breakup model for transient Diesel fuel sprays

Turner, MR, Sazhin, SS, Healey, JJ, Crua, C and Martynov, SB (2012) A breakup model for transient Diesel fuel sprays Fuel: The Science and Technology of Fuel and Energy, 97. 288 - 305. ISSN 0016-2361

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Abstract

In this paper a breakup model for analysing the evolution of transient fuel sprays characterised by a coherent liquid core emerging from the injection nozzle, throughout the injection process, is proposed. The coherent liquid core is modelled as a liquid jet and a breakup model is formulated. The spray breakup is described using a composite model that separately addresses the disintegration of the liquid core into droplets and their further aerodynamic breakup. The jet breakup model uses the results of hydrodynamic stability theory to de ne the breakup length of the jet, and downstream of this point, the spray breakup process is modelled for droplets only. The composite breakup model is incorporated into the KIVA II Computational Fluid Dynamics (CFD) code and its results are compared with existing breakup models, including the classic WAVE model and a previously developed composite WAVE model (modi ed WAVE model) and in{house experimental observations of transient Diesel fuel sprays. The hydrodynamic stability results used in both the jet breakup model and the WAVE droplet breakup model are also investigated. A new velocity pro le is considered for these models which consists of a jet with a linear shear layer in the gas phase surrounding the liquid core to model the e ect of a viscous gas on the breakup process. This velocity pro le changes the driving instability mechanism of the jet from a surface tension driven instability for the currently used plug ow jet with no shear layers, to an instability driven by the thickness of the shear layer. In particular, it is shown that appreciation of the shear layer instability mechanism in the composite model allows larger droplets to be predicted at jet breakup, and gives droplet sizes which are more consistent with the experimental observations. The inclusion of the shear layer into the jet velocity pro le is supported by previous experimental studies, and further extends the inviscid ow theory used in the formulation of the classic WAVE breakup model.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Fuel. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fuel, 97, Feb 2012, DOI 10.1016/j.fuel.2012.01.076.
Uncontrolled Keywords: spray, break up, stability, jet
Divisions: Faculty of Engineering and Physical Sciences > Mathematics
Depositing User: Symplectic Elements
Date Deposited: 16 May 2012 18:56
Last Modified: 23 Sep 2013 19:24
URI: http://epubs.surrey.ac.uk/id/eprint/527105

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