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Influence of Injection and Ambient Conditions on the Nozzle Exit Spray of an Outwardly Opening GDI Injector
Technical Paper
2012-01-0396
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Spray penetration and mixture formation in GDI engines are
crucial to a reliable ignition and the subsequent combustion. For
the prediction of the mixture formation process, computational
fluid dynamic simulations are applied. Therefore, details about the
nozzle exit conditions are essential, either as boundary conditions
to be set, or to validate the numerical results.
This paper presents experimental results on the influence of
boundary conditions on the spray structure at the nozzle exit of a
GDI injector. The injector investigated is an outwardly opening
piezo injector, generating a hollow cone spray with a string
structure. The distribution of the strings (the so-called
"string structure") is needed for the starting conditions
of the computational fluid dynamic simulations, as the origin of
the strings is unresolved so far. The experiments are conducted in
a constant volume pressure chamber varying the ambient temperature
between 300 and 600 K and the ambient pressure between 0.1 and 1.0
MPa. Analyzing the impact of the different injection conditions,
the injection pressure is varied between 8 and 12 MPa, utilizing
energizing durations between 200 and 600 μs. In addition, the
needle lifts are varied, too. Visualization techniques are used to
investigate the spray structure and the penetration length.
The evaluation of the results is divided into two parts. First,
spray images of the nozzle exit flow are compared concentrating on
general parameters of the spray such as the penetration length. In
the second part, the string structure is investigated by extracting
the light intensity profile at certain nozzle distances. The
analysis of the spray structure shows that the ambient and
injection pressure as well as the ambient temperature influence the
circumferential fuel distribution at the nozzle exit; the needle
lift shows no significant influence in the visualization results.
Comparing the influence of the different parameters on the string
distribution shows that the injection pressure and the ambient
temperature have the greatest influence. But even though the
greatest influence can be observed varying the injection pressure
and the ambient temperature, these influences are very small.
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Authors
Citation
Cordes, D., Pischke, P., and Kneer, R., "Influence of Injection and Ambient Conditions on the Nozzle Exit Spray of an Outwardly Opening GDI Injector," SAE Technical Paper 2012-01-0396, 2012, https://doi.org/10.4271/2012-01-0396.Also In
References
- Nouri, J.M. Hamid, M.A. Yan, Y. Arcoumanis, C. “Spray characterization of a piezo pintle-type injector for gasoline direct injection engines” Journal of Physics Conference Series 85 2007 10.1088/1742-6596/85/1/012037
- Yan, Y. Gashi, S. Nouri, J. Lockett, R. Arcoumanis, C. “Investigation of spray characteristics in a spray-guided DISI engine using PLIF and LDV” Journal of Physics Conference Series 85 2007 10.1088/1742-6596/85/1/012036
- Befrui, B. Corbinelli, G. Robart, D. Reckers, W. et al. “LES Simulation of the Internal Flow and Near-Field Spray Structure of an Outward-Opening GDi Injector and Comparison with Imaging Data,” SAE Technical Paper 2008-01-0137 2008 10.4271/2008-01-0137
- Gavaises, M. Tonini, S. Marchi, A. Theodorakakos, A. Bouris, D. Matteucci, L. “Modelling of internal and near-nozzle flow of a pintle-type outwards-opening gasoline piezo injector” International Journal of Engine Research 7 381 397 2006 10.1243/14680874JER00306
- Arcoumanis, C. “Flow and combustion in reciprocating engines” Springer-Verlag Berlin 978-3-540-64142-1 2008
- Reckers, W. Befrui, B. Corbinelli, G. “Investigation of High Pressure GDi Conical Spray Atomization for Spray Guided Combustion Systems” 8. Internationales Symposium für Verbrennungsdiagnostik 2008 Baden-Baden, Germany 2008
- Martin, D. Cardenas, M. Pischke, P. Kneer, R. “Experimental Investigation of Near Nozzle Spray Strcture and Velocity for a GDI Hollowcone Spray” Atomization and Sprays 20 12 1065 1076 2010 10.1615/AtomizSpr.v20.i12.40
- Martin, D. Stratmann, J. Pischke, P. Kneer, R. et al. “Experimental Investigation of the Interaction of Multiple GDI Injections using Laser Diagnostics,” SAE Int. J. Engines 3 1 372 388 2010 10.4271/2010-01-0596
- Giannadakis, E. Papoulias, D. Theodorakakos, A. Gavaises, M. “Simulation of cavitation in outward-opening piezo-type pintle injector nozzles” Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 222 1895 1910 2008 10.1243/09544070JAUTO728
- Martin, D. Pischke, P. Cardenas, M. Kneer, R. “Investigation of the Influence of Needle Lift on Spray Structure and Velocity for a GDI Hollow Cone Spray” ILASS Europe 2011 Estoril, Protugal 2011