The Dilution, Chemical, and Thermal Effects of Exhaust Gas Recirculation on Diesel Engine Emissions - Part 2: Effects of Carbon Dioxide

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

doi:10.4271/961167

Cited by 103 publications

(64 citation statements)

References 9 publications

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“…The chemical effect of CO2 also has a positive (increasing) effect on the total ignition delay at the compressed temperature below 730 K, and then the chemical effect of CO2 starts to decrease the total ignition delay. Moreover, the chemical effect of CO2 becomes pronounced in the NTC region and ultimately the chemical effect exceeds the thermal effect at the compressed temperature higher than 880 K. Additionally, from Figures 12 and 13, the conclusion can be drawn that, compared to Ar, the chemical effect of CO2 is more pronounced at a high compressed temperature due to its high collision coefficients; moreover, CO2 acts as a reactant in some elementary reactions [1,8].…”

Section: Thermal and Chemical Effects Of Buffer Gas Compositionmentioning

confidence: 90%

“…They found that EGR leads to extended ignition delay which is essential in mixture formation before ignition, improved indicated mean effective pressure (IMEP) and hence improved thermal efficiency. Ladommatos et al [8] separately studied the thermal, chemical and dilution effects of CO2 on engine combustion and emissions. The authors found that CO2 addition increases the ignition delay, and then affects both NOx and soot emissions.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Buffer Gas Composition on Autoignition of Dimethyl Ether

et al. 2015

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Abstract:Experimental and numerical studies are conducted on the thermal, chemical and dilution effects of buffer gas composition on autoignition of dimethyl ether (DME). The buffer gases considered are nitrogen (N2), a mixture of N2 and argon (Ar) at a mole ratio of 50%/50% and a mixture of Ar and carbon dioxide (CO2) at a mole ratio of 61.2%/38.8%. Experiments are performed using a rapid compression machine (RCM) at compressed pressure of 10 bar, equivalence ratio (φ) of 1, and compressed temperature from 670 K to 795 K. The N2 dilution ratio considered ranges from 36.31% to 55.04%. The experimental results show that buffer gas composition has little impact on the first-stage ignition delay. However, significant differences in the total ignition delay as a function of buffer gas composition are observed in the negative temperature coefficient (NTC) region. Compared to N2, N2/Ar (50%/50%) mixture decreases the total ignition delay by 31%. The chemical effects of buffer gas composition on the first-stage and total ignition delays are negligible. With increasing N2 dilution ratio, the first-stage ignition delay slightly increases, while a significant increase in the total ignition delay is observed. Moreover, the NTC behavior of total ignition delay is noted to become more pronounced at high N2 dilution ratio. The heat release during the first-stage ignition decreases as N2 dilution ratio increases. Results of OPEN ACCESSEnergies 2015, 8 10199 numerical simulations with the Zhao DME mechanism over a wider range of temperature show good agreement with that of experiments. Further numerical simulations are conducted using pure N2, Ar and CO2 as buffer gases. Results indicate that the thermal effects are the dominant factor in low temperature and NTC regions. The chemical effects become pronounced in the NTC region, and the chemical effect of CO2 exceeds the thermal effect at the compressed temperature higher than 880 K.

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Section: Thermal and Chemical Effects Of Buffer Gas Compositionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effects of Buffer Gas Composition on Autoignition of Dimethyl Ether

et al. 2015

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“…Ladommatos et al [17][18][19][20] presented a series of works focused on understanding the influence of EGR on combustion and emissions in a four-cylinder diesel engine. To simulate the different effects of EGR, the authors added synthetic gases in the engine intake manifold.…”

Section: Introductionmentioning

confidence: 99%

Effects of EGR rate on performance and emissions of a diesel power generator fueled by B7

Serio

Oliveira

Sodré

2017

J Braz. Soc. Mech. Sci. Eng.

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“…Exhaust Gas Recirculation (EGR) is a simple and most effective way of reducing NOX emissions from diesel engines [E]. EGR changes the diesel combustion process of engine because of three broadly defined effects [7][8][9]11]. Thermal Effect: The recycled inert gases, predominantly carbon dioxide (CO2) and water vapor (H2O) increase the specific heat capacity of the intake charge, thereby lowering the temperatures during the compression and combustion processes.…”

Section: Introductionmentioning

confidence: 99%