A PC-Based Model for Predicting NOx Reductions in Diesel Engines

Dodge, Lee G.; Leone, Douglas M.; Naegeli, D. W.; Dickey, Daniel W.; Swenson, Kendall R.

doi:10.4271/962060

Cited by 20 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Useful information on the zero-dimensional emissions models can be found in Nightingale (1975), Lipkea and DeJoode (1994), Dodge et al (1996), Zhang (1998), Easley et al (2000, Yang et al (2002), Kolade et al (2004), Ponti et al (2007), Lafossas et al (2007), a group of researchers at the Lund University in Sweden (Egnell, 1998(Egnell, , 1999(Egnell, , 2000Andersson et al, 2006aAndersson et al, , 2006bEricson et al, 2006;Wilhelmsson et al, 2009), and a group of researchers at the National Technical University of Athens in Greece (Kouremenos et al, 1997;Rakopoulos and Hountalas, 1998;Rakopoulos et al, 1999;Pariotis et al, 2006). …”

Section: Zero-dimensional Approachmentioning

confidence: 97%

Combustion, emissions, and calibration for diesel engine system design

Xin¹

2013

Diesel Engine System Design

View full text Add to dashboard Cite

Section: Zero-dimensional Approachmentioning

confidence: 97%

Combustion, emissions, and calibration for diesel engine system design

Xin¹

2013

Diesel Engine System Design

View full text Add to dashboard Cite

“…The former group uses a semi-empirical description for radiation losses and dissociation, leading to lower temperatures than the adiabatic flame temperature. On the other hand, Dodge et al 44 and Timoney et al 45 have returned to the Shahed approach, with the former using a purely empirical expression for the NOx formation rate and the latter a simplified Zel'dovich expression. However, all use semi-empirical mixing-rate expressions that do not necessarily possess a scientific basis.…”

Section: Survey On Nox Modellingmentioning

confidence: 99%

NOx emissions in direct injection diesel engines – part 1: Development of a phenomenological NOx model using experiments and three-dimensional computational fluid dynamics

Brückner

Pandurangi

Kyrtatos

et al. 2017

International Journal of Engine Research

View full text Add to dashboard Cite

There exists a well-established correlation of exhaust NOx emissions arising from diesel engines with the adiabatic flame temperature, in particular for conventional (i.e. short ignition delay, diffusion combustion-dominated) operating conditions. Most published NOx emission models rely on this correlation. However, numerous experimental studies have identified operating conditions where this correlation fails to capture the exhaust NOx trend. In this work, a novel phenomenological NOx model concept is introduced, including a first successful validation against experimental data. The model development is based on experimental observations and is supported by three-dimensional computational fluid dynamics computations, strengthening the understanding of the underlying mechanisms leading to the discrepancy between the adiabatic flame temperature and exhaust NOx trend. For long ignition delay operating conditions, the improved mixture preparation before ignition leads to reduced mixing rates during and after combustion. Both the improved mixture preparation before ignition and the instantaneous increase of mass observed above 2000 K after start of combustion are due to compression heating of the burned gases. Key features of the model are improved description of mixture distribution at start of combustion, NOx formed in products of premixed burn, different physical treatments of premixed and diffusion sourced products, and inherent consideration of burned gas compression heating. Model results capture the NOx emissions for conventional diesel combustion, as well as for operating conditions where the NOx emissions do not follow the adiabatic flame temperature trend. Moreover, the results show that the contribution of NOx from products from premixed burn and the consideration of compression heating effects on burned (postflame) gases are essential to capture the NOx emissions under the latter conditions.

show abstract

“…Further, the increased compression ratio (9.25 to 11.0) lowers the temperature at exhaust valve opening by a predicted 65°C, and switching from gaso line to ethanol is predicted to further lower the tempera ture by 53°C, making it more difficult to keep the catalyst active. (These calculations were made with the SwRI ALAMO_ENGINE cycle simulation [3].) Thus, this test bed that includes both a high compression engine and an ethanol blend fuel represents a challenging vehicle for developing ULEV strategies.…”

Section: Issn 0148-7191mentioning

confidence: 99%