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Quantitative Analysis of Low Pressure-Driven Spray Mass Distribution and Liquid Entrainment for SCR Application through a Mechanical Patternator
Technical Paper
2017-01-0965
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The application of liquid aqueous Urea Solution (AUS) as reductant in SCR exhaust after-treatment systems is now a commonly accepted industry standard. Unfortunately, less acceptable are the associated difficulties caused by incomplete decomposition of the liquid, resulting in solid deposits which accumulate in the exhaust pipe downstream of the dosing components. The correct prediction of the spray pattern and, therefore, the spray impact on the walls is a key feature for the system optimization. A mechanical patternator, designed on the basis of CFD performance assessment, involving a Lagrangian representation of the dispersed liquid fully coupled with a 3D Eulerian description of the carrier phase, has been built and used to measure the spray mass distribution. The effect of the droplets generated from the interaction among spray, probes and contingent liquid film is taken into account in the geometrical definition of the shape and the position of the patternator, as well as the flow field modification. The whole simulation process is carried out with the open source finite volume platform OpenFOAM®. The investigation of the effect of a wide range of thermal and kinematic cross flow conditions on the behavior of a multi-hole pressure-driven injector for SCR applications has been performed in an engineless test bench at the Empa laboratories. Major focus is put on the evaluation of the complete spray footprint, which is collected with high spatial resolution to generate a reliable map of the conditions, aiming at avoiding the formation of permanent liquid film, which is undeniably the basis of solid deposit formation. A detailed parametric analysis of the liquid entrainment and of the impact location is reported to provide a concise description of the spray behavior.
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Nocivelli, L., Montenegro, G., Onorati, A., Curto, F. et al., "Quantitative Analysis of Low Pressure-Driven Spray Mass Distribution and Liquid Entrainment for SCR Application through a Mechanical Patternator," SAE Technical Paper 2017-01-0965, 2017, https://doi.org/10.4271/2017-01-0965.Data Sets - Support Documents
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References
- Isabella Nova and Enrico Tronconi Urea-SCR technology for deNOx after treatment of diesel exhausts Springer 2014
- Manfred Koebel , Martin Elsener , and Michael Kleemann Urea-scr: a promising technique to reduce no x emissions from automotive diesel engines Catalysis today 59 3 335 345 2000
- Schaber Peter M , Colson James , Higgins Steven , Dietz Ed , Thielen Daniel , Anspach Bill , and Brauer Jonathan Study of the urea thermal decomposition (pyrolysis) reaction and importance to cyanuric acid producition American laboratory 31 16 13 21 1999
- BASF Catalogue. Adblue Technical Leaflet, M 6621 1 6
- Birkhold , F. , Meingast , U. , Wassermann , P. , and Deutschmann , O. Analysis of the Injection of Urea-Water-Solution for Automotive SCR DeNOx-Systems: Modeling of Two-Phase Flow and Spray/Wall-Interaction SAE Technical Paper 2006-01-0643 2006 10.4271/2006-01-0643
- Strots , V. , Santhanam , S. , Adelman , B. , Griffin , G. et al. Deposit Formation in Urea-SCR Systems SAE Int. J. Fuels Lubr. 2 2 283 289 2010 10.4271/2009-01-2780
- Liao , Y. , Dimopoulos Eggenschwiler , P. , Spiteri , A. , Nocivelli , L. et al. Fluid Dynamic Comparison of AdBlue Injectors for SCR Applications SAE Int. J. Engines 8 5 2303 2311 2015 10.4271/2015-24-2502
- Alexander Spiteri and Eggenschwiler Panayotis Dimopoulos Experimental fluid dynamic investigation of urea-water sprays for diesel selective catalytic reduction-denox applications Industrial & Engineering Chemistry Research 53 8 3047 3055 2014
- van Vuuren , N. , Brizi , G. , Buitoni , G. , Postrioti , L. et al. Experimental Analysis of the Urea-Water Solution Temperature Effect on the Spray Characteristics in SCR Systems SAE Technical Paper 2015-24-2500 2015 10.4271/2015-24-2500
- Alessandro Montanaro , Luigi Allocca , Michela Costa , and Ugo Sorge Assessment of a 3d cfd model for gdi spray impact against wall through experiments based on different optical techniques International Journal of Multiphase Flow 84 204 216 2016
- Panão MRO and Moreira ALN Thermo-and fluid dynamics characterization of spray cooling with pulsed sprays Experimental Thermal and Fluid Science 30 2 79 96 2005
- Panão Miguel R Oliveira , Moreira António LN , and Durão Diamantino FG Effect of a cross-flow on spray impingement with port fuel injection systems for hcci engines Fuel 106 249 257 2013
- Bade KM and Schick RJ Volume distribution comparison methods for 1d, 2d, and point measurement techniques ILASS Americas 2008
- Strakey PA , Talley DG , and Hutt JJ Mixing characteristics of coaxial injectors at high gas/liquid momentum ratios Journal of Propulsion and Power 17 2 402 410 2001
- Graham Wigley , Hargrave Graham K , and John Heath A high power, high resolution lda/pda system applied to gasoline direct injection sprays Particle & particle systems characterization 16 1 11 19 1999
- Achinta Varna , Spiteri Alexander C , Wright Yuri M Panayotis Dimopoulos Eggenschwiler, and Konstantinos Boulouchos. Experimental and numerical assessment of impingement and mixing of urea-water sprays for nitric oxide reduction in diesel exhaust Applied Energy 157 824 837 2015
- Schick Rudolf J Spray technology reference guide: Understanding drop size Spraying Systems Co. Bulletin B 459 8 16 2008
- Hrvoje Jasak , Aleksandar Jemcov , Zeljko Tukovic et al. Openfoam: A c++ library for complex physics simulations International workshop on coupled methods in numerical dynamics 1000 1 20 IUC Dubrovnik Croatia 2007
- Dukowicz John K A particle-fluid numerical model for liquid sprays Journal of Computational Physics 35 2 229 253 1980
- Varna , A. , Boulouchos , K. , Spiteri , A. , Dimopoulos Eggenschwiler , P. et al. Numerical Modelling and Experimental Characterization of a Pressure-Assisted Multi-Stream Injector for SCR Exhaust Gas After-Treatment SAE Int. J. Engines 7 4 2012 2021 2014 10.4271/2014-01-2822
- Crowe Clayton T , Schwarzkopf John D , Martin Sommerfeld , and Yutaka Tsuji Multiphase flows with droplets and particles CRC press 2011
- Lorenzo Nocivelli , Gianluca Montenegro , Yujun Liao , Eggenschwiler Panayotis Dimopoulos , Campbell John , and Nicola Rapetto Modeling of aqueous urea solution injection with characterization of spray-wall cooling effect and risk of onset of wall wetting Energy Procedia 82 38 44 2015