This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
CFD Modeling of Mini and Full Flow Burner Systems for Diesel Engine Aftertreatment under Low Temperature Conditions
Technical Paper
2012-01-1949
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
With introductions of stringent diesel engine emission regulations, the DOC and DPF systems have become the mainstream technology to eliminate soot particles through diesel combustion under various operation conditions. Urea-based SCR has been the mainstream technical direction to reduce NOx emissions. For both technologies, low-temperature conditions or cold start conditions pose challenges to activate DOC or SCR emission-reduction performance. To address this issue, mini or full flow burner systems may be used to increase exhaust temperature to reach DOC light-off or SCR initiation temperature by combustion of diesel fuel. In essence, the burner systems incorporate a fuel injector, spray atomization, proper fuel / air mixing mechanisms, and combustion control as independent heat sources.
To effectively integrate burners, Computational Fluid Dynamics (CFD) combustion models have been developed to investigate the influence of temperature distribution, fuel droplet transport and breakup, fuel vapor combustion, heat radiation and other relevant phenomena. Development work starts with a baseline mini-burner design, and measures have been taken to improve CFD modeling approaches and optimize the performance of downstream subsystems including connecting pipe, DOC, and mixers.
Since burners work as heating sources, one performance factor of interest is the light-off delay time for substrates to reach catalyst activation temperature or active regeneration temperature. 0-D analytical formula and CFD models were developed to predict lightoff time history. The dependence of time history on substrate thermal property was investigated in multiple scenarios.
Authors
Topic
Citation
Zhao, Z., Zheng, G., Shan, X., and Kotrba, A., "CFD Modeling of Mini and Full Flow Burner Systems for Diesel Engine Aftertreatment under Low Temperature Conditions," SAE Technical Paper 2012-01-1949, 2012, https://doi.org/10.4271/2012-01-1949.Also In
References
- EPA Regulatory Standards http://epa.gov/diesel
- Walker, A.P. Controlling Particulate Emissions from Diesel Vehicles Topics in Catalysis 28 1-4 April 2004
- Zheng, G. Kotrba, A. Golin, M. Gardner, T. et al. “Overview of Large Diesel Engine Aftertreatment System Development,” SAE Technical Paper 2012-01-1960 2012 10.4271/2012-01-1960
- Sampath, M. Zheng, G. Kotrba, A. “Integration of Diesel Burner for Large Engine Aftertreatment using CFD,” SAE Technical Paper 2010-01-1946 2010 10.4271/2010-01-1946
- Zheng, G. Sampath, M. Kotrba, A. “The Role of CFD Combustion Simulation in Diesel Burner Development,” SAE Technical Paper 2009-01-2878 2009 10.4271/2009-01-2878
- Sampath, M. Zheng, G. Zhang, Y. Kotrba, A. et al. “CFD Optimization of Exhaust Manifold for Large Diesel Engine Aftertreatment Systems,” SAE Technical Paper 2011-01-2199 2011 10.4271/2011-01-2199
- Fluent Methodology Manual 2007
- Stiesch, G. Modeling Engine Spray and Combustion Processes Springer-Verlag Berlin 2003
- Zheng, G. Palmer, G. Salanta, G. Kotrba, A. “Mixer Development for Urea SCR Applications,” SAE Technical Paper 2009-01-2879 2009 10.4271/2009-01-2879
- Star-CD Methodology Manual 4.08 2006