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Numerical and experimental investigation of early stage diesel sprays

journal contribution
posted on 2023-05-18, 17:31 authored by Matt Ghiji, Goldsworthy, L, Paul BrandnerPaul Brandner, Vikrambhai GaraniyaVikrambhai Garaniya, Hield, P
Experimental and numerical investigations of primary atomization in a high-pressure diesel jet are presented. Information on flow processes and structures inside and near nozzle exit are described at early and quasi-steady stages of injection. The numerical method is based on the Volume Of Fluid (VOF) phase-fraction interface capturing technique, in an Eulerian framework. The influence of grid resolution, convection interpolation scheme and temporal integration scheme on the modeling of jet physics are investigated. The present flow setup includes in-nozzle disturbances with the no-slip condition at the walls. All experimental operating conditions are replicated in the numerical models. The early stage liquid jet leading edge demonstrates an umbrella-shaped structure in the numerical results which is in qualitative agreement with experimental imaging. Data obtained provide insight into the flow behavior in the dense region including commencement of fragmentation and early spray angle formation. Experimental images show a cloud of air–fuel mixture at the early stage of injection. The existence of ingested air inside the injector after needle closure could be the source of the observed deviation between experimental and numerical results. The results show that the jet breakup rate and liquid core length increase in cases with higher grid resolutions. The early spray angle from the numerical results at the quasi-steady stage, shows good agreement with experimental data.

Funding

Defence Science and Technology Group

History

Publication title

Fuel

Volume

175

Pagination

274-286

ISSN

0016-2361

Department/School

Australian Maritime College

Publisher

Elsevier Ltd

Place of publication

United Kingdom

Rights statement

?Copyright 2016 Elsevier Ltd. All rights reserved.

Repository Status

  • Restricted

Socio-economic Objectives

Environmentally sustainable transport activities not elsewhere classified