Empirical and Theoretical Investigations of Active-flow Control on Diesel Engine After-treatment

Zheng, Ming; Dong, Wang; Reader, Graham T.; Wang, Meiping

doi:10.4271/2006-01-0465

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…Even with slightly higher boost pressure, PCCI still produced higher CO and THC. While higher THC and CO emissions could have benefits for diesel aftertreatment, such as for fuel-reforming and after-treatment regeneration, it should be noted that extremely high levels of THC could be an indicator of poor fuel efficiency and could also be dangerous for after-treatment equipment because of the potential for the hydrocarbons to ignite and cause dangerously high temperatures in excess of 1200 • C. Continuous temperature at this level could cause physical damage to the after-treatment equipment [12,13,19]. Examining the NO x and smoke emissions, shown in Figures 5 and 6, similar trends were noticed.…”

Section: Emission Comparison Of Late Pcci and Htc Postinjectionmentioning

confidence: 99%

“…Favourable exhaust conditions include exhaust gas temperatures in the range of 400 • C, increased hydrogen (H 2 ) content, and the ability to produce periodically hydrocarbon rich exhaust. The hydrocarbon rich exhaust is periodically needed for diesel particulate trap (DPF) and lean NO x trap (LNT) regeneration [12,13]. It could also be beneficial to have a fuel-rich exhaust for the use of exhaust fuel reforming devices [14].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Postinjection Application with Late Partially Premixed Combustion on Power Production and Diesel Exhaust Gas Conditioning

Jeftić

Han

et al. 2011

Journal of Combustion

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The effects of postinjection with late partially premixed charge compression ignition (PCCI) were investigated with respect to diesel exhaust gas conditioning and potential power production. Initial tests comparing postinjection application with PCCI to that with conventional diesel high temperature combustion (HTC) indicated the existence of similar trends in terms of carbon monoxide (CO), total unburned hydrocarbon (THC), oxides of nitrogen (NOx), and smoke emissions. However, postinjection in PCCI cycles exhibited lower NOxand smoke but higher CO and THC emissions. With PCCI operation, the use of postinjection showed much weaker ability for raising the exhaust gas temperature compared to HTC. Additional PCCI investigations generally showed increasing CO and THC, relatively constant NOx, and decreasing smoke emissions, as the postinjection was shifted further from top dead center (TDC). Decreasing the overall air-to-fuel ratio resulted in increased hydrogen content levels but at the cost of increased smoke, THC and CO emissions. The power production capabilities of early postinjection, combined with PCCI, were investigated and the results showed potential for early postinjection power production.

show abstract

Section: Emission Comparison Of Late Pcci and Htc Postinjectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Postinjection Application with Late Partially Premixed Combustion on Power Production and Diesel Exhaust Gas Conditioning

Jeftić

Han

et al. 2011

Journal of Combustion

Self Cite

View full text Add to dashboard Cite

show abstract

“…Their results indicated that the inert monolith blocks could (a) enhance the heat recuperation, (b) reduce the temperature gradient, (c) decrease the substrate temperature, (d) increase the conversion efficiency of soot oxidation, and (e) decrease dependence on the thermal properties of the substrate materials and the operating conditions. Furthermore, Zheng et al 19‐21 performed an experimental study on an aftertreatment system of diesel oxidation catalysts (DOCs) plus noncatalytic DPFs under PRF operations. Their results pointed out that the “light‐off” temperature region could be maintained at certain locations.…”

Section: Introductionmentioning

confidence: 99%

Study on characteristics of particulate emission of diesel aftertreatment with reciprocating flow

Deng

Wang

et al. 2021

Energy Science & Engineering

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In this article, in order to optimize diesel aftertreatment system with periodically reciprocating flow (PRF), an experimental study is conducted to investigate its characteristics such as pollution emissions, regeneration of diesel particulate filter (DPF), concentration, and size distribution of particulate matter (PM) escaped as well as temperature distribution under unidirectional flow and PRF operating conditions. The effects of reciprocating flow cycle and exhaust gas flow on the performance of aftertreatment system are investigated in detail. The energy efficiency analysis of the aftertreatment system is also carried out. Experimental results show that (a) as the temperature is lower than the light‐off threshold of combustible gas, the aftertreatment system cannot restrain the formation of second particles under the low‐temperature condition of unidirectional flow; and (b) the aftertreatment system demonstrates excellent performance of trapping particles and filter regeneration as the symmetrical temperature distribution is formed. The PM filter efficiency αPM is 92%, and the specific energy consumption β is 124% for symmetrical temperature distribution; (c) the increase in reciprocating flow cycle could lead to the shifting of the temperature profiles, and this would affect the particle size distribution; (d) a certain increase in exhaust gas flow from engine would have insignificant change for the temperature distribution; and (e) the critical energy efficiency ηc of the system could reach 96.61%.

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Influence of Biodiesel Fuel on Diesel Engine Performance and Emissions in Low Temperature Combustion

Zheng

Mulenga

Reader

et al. 2006

SAE Technical Paper Series

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Empirical and Theoretical Investigations of Active-flow Control on Diesel Engine After-treatment

Cited by 6 publications

References 17 publications

Effects of Postinjection Application with Late Partially Premixed Combustion on Power Production and Diesel Exhaust Gas Conditioning

Effects of Postinjection Application with Late Partially Premixed Combustion on Power Production and Diesel Exhaust Gas Conditioning

Study on characteristics of particulate emission of diesel aftertreatment with reciprocating flow

Influence of Biodiesel Fuel on Diesel Engine Performance and Emissions in Low Temperature Combustion

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