Effect of ethanol fraction on the combustion and emission characteristics of a dimethyl ether-ethanol dual-fuel reactivity controlled compression ignition engine

Park, Su Han; Shin, Daejung; Park, Jeonghyun

doi:10.1016/j.apenergy.2016.07.101

Cited by 54 publications

(19 citation statements)

References 26 publications

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“…The potential of the RCCI concept has been recently demonstrated in different engine platforms: single-cylinder [28], multi-cylinder [29], heavy-duty [30], medium-duty [31] and light-duty diesel engines [32] operating with low [33], medium [34] and high [35] compression ratios (CR). These works conclude that, under stationary conditions, RCCI is able to achieve NOx levels below the limits proposed by the emissions regulations, together with ultra-low soot emissions [36].…”

Section: Introductionmentioning

confidence: 99%

Fuel consumption and engine-out emissions estimations of a light-duty engine running in dual-mode RCCI/CDC with different fuels and driving cycles

Benajes

García

Monsalve‐Serrano

et al. 2018

Energy

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This work compares the performance and emissions of two dual-mode combustion concepts over different driving cycles by means of vehicle systems simulations. The dual-mode concept relies on switching between the dual-fuel concept known as reactivity controlled compression ignition (RCCI) and conventional diesel combustion (CDC) to cover the whole engine map. The experimental RCCI maps obtained with diesel-E85 and diesel-gasoline used as inputs to perform the simulations were obtained in a high compression ratio light-duty diesel engine (17.1:1) following the same mapping procedure in both cases. The driving cycles simulated to perform the comparison were the Real Driving Emissions cycle (Europe), Worldwide harmonized Light vehicles Test Cycle (Europe), Federal Test Procedure FTP-75 (United States) and JC08 (Japan). The results show that the dual-mode concept has potential to be implemented in flexible-fuel vehicles. Using gasoline as low reactivity fuel (LRF) for RCCI, the vehicle mileage would be equal to CDC, but having reductions in NOx and soot emissions of 16% and 50%, respectively, along the RDE cycle. Using E85 instead of gasoline, the reductions in NOx and soot emissions increase up to 50% and 85%, respectively, but in this case promoting higher thermal efficiency than CDC.

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Section: Introductionmentioning

confidence: 99%

Fuel consumption and engine-out emissions estimations of a light-duty engine running in dual-mode RCCI/CDC with different fuels and driving cycles

Benajes

García

Monsalve‐Serrano

et al. 2018

Energy

View full text Add to dashboard Cite

show abstract

“…Several studies have been carried out to demonstrate the potential of the RCCI strategy addressing single-cylinder [21], multi-cylinder [22], heavy-duty [23], medium-duty [24], and light-duty diesel engines [25] operating with low [26], medium [27], and high [28] compression ratios (CR). In general, the results demonstrated that operation in stationary conditions results in NOx levels that are below the limits proposed by the emissions regulations, together with ultra-low soot emissions [29].…”

Section: Introductionmentioning

confidence: 99%

Potential of RCCI Series Hybrid Vehicle Architecture to Meet the Future CO2 Targets with Low Engine-Out Emissions

et al. 2018

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Reactivity controlled compression ignition (RCCI) combustion has been shown to provide simultaneous ultra-low NOx and soot emissions with similar or better thermal efficiencies than conventional diesel combustion (CDC). Nonetheless, RCCI still has several challenges that restrict its operating range and limit its practical application. The dual-mode operation, which involves switching between different combustion modes, has been found as a promising alternative to operation in the whole engine map. However, the combustion mode switching requires difficult engine control, particularly during transient operation. The series hybrid vehicle (SHV) architecture allows the thermal engine to operate in a limited operating range by decoupling it from the drivetrain. Therefore, it could be an interesting alternative to the dual-mode concept. This work explores the potential of the RCCI series hybrid vehicle architecture to provide low engine-out emissions and CO2 by means of vehicle systems simulations. The results show the influence of the main parameters and control strategies of the SHV vehicle on its efficiency and emissions under different driving cycles. Finally, the optimal RCCI-SHV configuration is compared to CDC and dual-mode combustion strategies, confirming its potential as a future vehicle architecture for high efficiency and low emissions.

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“…The potential of the RCCI concept has been recently demonstrated in different engine platforms: single-cylinder [23], multi-cylinder [24], heavy-duty [25], medium-duty [26] and light-duty diesel engines [27] operating with low [28], medium [29] and high [30] compression ratios (CR). These works conclude that RCCI is able to achieve NOx levels below the limits proposed by the emissions regulations, together with ultra-low soot emissions without the need for aftertreatment devices [31].…”

Section: Introductionmentioning

confidence: 99%

Sizing a conventional diesel oxidation catalyst to be used for RCCI combustion under real driving conditions

García

Piqueras

Monsalve‐Serrano

et al. 2018

Applied Thermal Engineering

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Reactivity controlled compression ignition (RCCI) combustion has demonstrated to be able to avoid the NOx-soot trade-off appearing during conventional diesel combustion (CDC), with similar or better thermal efficiency than CDC under a wide variety of engine platforms. However, a major challenge of this concept comes from the high hydrocarbon (HC) and carbon monoxide (CO) emission levels, which are orders of magnitude greater than CDC, and similar to those of port fuel injected (PFI) gasoline engines. The high HC and CO emissions levels combined with the low exhaust temperatures during RCCI operation could present a challenge for the current exhaust aftertreatment technologies. The objective of this work is to evaluate the potential of a conventional diesel oxidation catalyst (DOC) for light-duty diesel engines when operating under dual-fuel RCCI dieselgasoline combustion and to define its necessary size to accomplish with the current emissions standards. For this purpose, a 1-D model has been developed and calibrated through gas emissions measurements upstream and downstream the DOC under different engine steady-state conditions. After that, the DOC response in transient conditions has been evaluated by means of vehicle systems simulations under different driving cycles representative of the homologation procedures currently in force around the world. The results show that the HC and CO levels at the DOC outlet are unacceptable considering the different emissions regulations. By this reason, a dedicated study to define the DOC size needed to accomplish the different emissions standards is carried out. The results suggest that, the DOC volume needed to fulfill the type approval regulation limits ranges from four to six times the original volume.

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Effect of ethanol fraction on the combustion and emission characteristics of a dimethyl ether-ethanol dual-fuel reactivity controlled compression ignition engine

Cited by 54 publications

References 26 publications

Fuel consumption and engine-out emissions estimations of a light-duty engine running in dual-mode RCCI/CDC with different fuels and driving cycles

Fuel consumption and engine-out emissions estimations of a light-duty engine running in dual-mode RCCI/CDC with different fuels and driving cycles

Potential of RCCI Series Hybrid Vehicle Architecture to Meet the Future CO2 Targets with Low Engine-Out Emissions

Sizing a conventional diesel oxidation catalyst to be used for RCCI combustion under real driving conditions

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