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Atomization and Sprays

Publication de 12  numéros par an

ISSN Imprimer: 1044-5110

ISSN En ligne: 1936-2684

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SIMULATION OF FUEL-EXHAUST MIXING IN EXHAUST AFTERTREATMENT SYSTEMS USING SIMPLIFIED SPRAY MODELS FOR PULSE-WIDTH MODULATED FUEL INJECTORS

Volume 19, Numéro 5, 2009, pp. 425-444
DOI: 10.1615/AtomizSpr.v19.i5.20
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RÉSUMÉ

The goal of this work is focused on improving fuel and exhaust mixing using virtual methods in order to optimize exhaust aftertreatment hardware. The aftertreatment application of interest is converting diesel fuel that is injected into an exhaust tailpipe over of a fuel reformer catalyst. The objective is to fully vaporize the atomized fuel droplets and mix the fuel vapor to create a uniform fuel vapor distribution at the inlet of the fuel reformer catalyst. A method is developed to model the fuel sprays from low-pressure injectors. This model is integrated into a simulation tool of fuel-exhaust vaporization and mixing. Standard spray measurement techniques are used to measure the key characteristics of the spray. The spray model defines the atomized drop size distribution and volume flux distribution using probability density functions that are independent of the fuel injection rate, resulting in a simple input file for the simulation. A variety of fuel injection profiles that capture the transient nature of the fuel reformer operation are specified in a user input file. The simulation of fuel-vapor distribution is qualitatively validated with measurements of exhaust temperatures exiting the fuel reformer catalyst. The simulation tool is used to optimize the mixing hardware, resulting in a uniform fuel vapor distribution. The hardware configuration is tested in the engine laboratory and shows a reduced exhaust temperature spread.

CITÉ PAR
  1. Ngan Evan, Wetzel Philip, McCarthy JR James, Yue Yong, Mahakul Budhadeb, Final Tier 4 Emission Solution Using An Aftertreatment System With A Fuel Reformer, LNT, DPF And Optional SCR, SAE Technical Paper Series, 1, 2011. Crossref

  2. McCarthy James, Korhumel Timothy, Marougy Andrew, Performance of a Fuel Reformer, LNT and SCR Aftertreatment System Following 500 LNT Desulfation Events, SAE International Journal of Commercial Vehicles, 2, 2, 2009. Crossref

  3. Armanini Bret Robert, McCarthy James Edward, Fuel Vaporizer Catalyst Enables Compact Aftertreatment System Packaging by Reducing Mixing Length, SAE Technical Paper Series, 1, 2010. Crossref

  4. McCarthy James Edward, Dykes Erik, Ngan Evan, Strots Vadim O., Aftertreatment System Performance of a Fuel Reformer, LNT and SCR System Meeting EPA 2010 Emissions Standards on a Heavy-Duty Vehicle, SAE International Journal of Commercial Vehicles, 3, 1, 2010. Crossref

  5. Wetzel Philip, McCarthy James Edward, Kulkarni Milind, Mohanta Lokanath, Griffin Gregory, Diesel Exhaust Aftertreatment System Packaging and Flow Optimization on a Heavy-Duty Diesel Engine Powered Vehicle, SAE International Journal of Commercial Vehicles, 3, 1, 2010. Crossref

  6. Bamber Daniel William, Ambrose Steven Lee, McCarthy James Edward, Fuel Injector Optimization for Diesel Aftertreatment Systems Coupled with Exhaust Aftertreatment System Performance on a Heavy-Duty Diesel Engine Powered Vehicle, SAE International Journal of Commercial Vehicles, 3, 1, 2010. Crossref

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