Effects of EGR on Heat Release in Diesel Combustion

Ladommatos, Nicos; Abdelhalim, S. M.; Zhao, Hua; Hu, Zhongzhi

doi:10.4271/980184

Cited by 128 publications

(78 citation statements)

References 11 publications

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“…Radicals such as OH are also known to be effective for soot oxidation and it is suggested that CO 2 and H 2 O kinetically enhance soot oxidation in a similar way to hydrocarbon oxidation through third body reactions. As a conclusion and combining the works of Ladommatos et al 11 and Anderlohr et al, 14 the thermal effect of CO 2 and H 2 O results in a reduction in NO X emissions and slight increase in net soot, while the kinetic effect results in a decrease in NO X and an enhancement in the rate of hydrocarbon and soot oxidation.…”

Section: The Effectiveness Of Combining a Doc And Dpf For Fegrmentioning

confidence: 89%

“…By directly isolating the dilution effect (i.e. comparing at the same O 2 intake concentration) which is the main effect according to Ladommatos et al, 11 it was be possible to distinguish a relationship with regards to the recirculation of the soot, gaseous HC and different CO 2 and H 2 O concentrations with an increasing EGR ratio. Results are given at 5 bar IMEP, mainly as the concentration of soot in the exhaust is large enough to show a soot recirculation penalty as observed in our earlier study.…”

Section: The Effectiveness Of Combining a Doc And Dpf For Fegrmentioning

confidence: 99%

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Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration

et al. 2012

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Exhaust gas recirculation (EGR) is currently widely used in commercial diesel engines to provide an effective solution in reducing the levels of nitrogen oxide (NO X ) emissions. However, this currently comes at the expense of an exponential increase in particulate matter (PM) emissions resulting directly from the dilution effect (i.e. reduction in oxygen availability), as well as a further penalty arising from the recirculation of the exhaust emissions such as soot and hydrocarbons. In our earlier work it was observed that filtered EGR (FEGR) was able to play a significant role in controlling the soot recirculation penalty and thus improve the overall NO X /soot trade-off. In order to further our understanding of the effect of recirculated exhaust gases and in particular recirculated soot and hydrocarbon (HC), comparisons were made between standard EGR, FEGR and pure nitrogen (N 2 ), a direct cleaner replacement of the exhaust gas. When implementing FEGR, a diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) were introduced into the exhaust to not only filter the soot particulates but reduce the recirculation of HC which can play a role in particulate surface growth. It was observed that the recirculated HC species and soot particles (especially at high load and EGR ratios) play a role in promoting the production and growth of further particles within the combustion chamber. Similarly, by comparing at the same O 2 intake concentration as that of FEGR and introducing N 2 as the EGR replacement gas, it was possible to correlate the increase in engineout mass of soot with EGR to the recirculation of soot particles, HC species as well as the presence of H 2 O and CO 2 .

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Section: The Effectiveness Of Combining a Doc And Dpf For Fegrmentioning

confidence: 89%

Section: The Effectiveness Of Combining a Doc And Dpf For Fegrmentioning

confidence: 99%

Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Due to the induction of exhaust gas, the global in-cylinder temperature is reduced, avoiding the thermal conditions favoured by NO x formation. Ladommatos et al [18] also revealed that the reduction in combustion temperature is a consequence of the reduced peak rate of the premixed phase combustion due to the lower oxygen availability.…”

Section: Engine Emission Optimisationmentioning

confidence: 99%

Application of Biodiesel in Automotive Diesel Engines

Li¹,

Tian²,

Xu³

2012

Biodiesel - Feedstocks, Production and Applications

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“…The research work by Andree & Pachernegg (1969) has shown impacts on ignition conditions as oxygen concentration is decreased due to the dilution by EGR. In addition, Ladommatos et al (1998) also revealed that the reduction in combustion temperature is a consequence of the reduced peak rate of the premixed phase combustion due to the lower oxygen availability when EGR is applied.…”

Section: Emission Control Technology For Biodiesel-fuelled Enginementioning

confidence: 99%

The Use of Biodiesel in Diesel Engines

Chuepeng¹

2011

Biodiesel- Quality, Emissions and by-Products

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Effects of EGR on Heat Release in Diesel Combustion

Cited by 128 publications

References 11 publications

Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration

Filtered EGR – a step towards an improved NOX/soot trade-off for DPF regeneration

Application of Biodiesel in Automotive Diesel Engines

The Use of Biodiesel in Diesel Engines

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