Injection strategy for simultaneous reduction of NOx and soot emissions using two-stage injection in DME fueled engine

Park, Su Han; Yoon, Seung Hyun

doi:10.1016/j.apenergy.2015.01.049

Cited by 56 publications

(18 citation statements)

References 41 publications

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“…That is, by using DME, the soot-NOx tradeoff is eliminated and methods of NOx control that would result in high soot levels for diesel fuel (e.g., high EGR), can be used to maintain diesel-like efficiency at acceptable NOx levels. Su et al [8] demonstrated this using engine experiments. Park et al [9] optimized the combustion chamber geometry and injection settings of a diesel engine fueled with DME.…”

Section: Introductionmentioning

confidence: 93%

Computational optimization of the combustion system of a heavy duty direct injection diesel engine operating with dimethyl-ether

Benajes

Pastor

Hernández-López

et al. 2018

Fuel

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A genetic algorithm optimization methodology is applied to the design of the combustion system of a heavy-duty diesel engine fueled with dimethyl ether (DME). The optimization includes the key combustion system related hardware, bowl geometry and injection nozzle design, together with the most relevant air management and injection settings. The GA was linked to the KIVA computational fluid dynamics code and an automated grid generation tool to perform a singleobjective optimization. The optimization target focused on maximizing efficiency, while keeping NOx emissions, peak pressure and maximum pressure rise rate under the baseline engine levels. This research work not only provides the optimum combustion system definition, but also the cause-effect relation between the inputs and outputs under investigation, identifying the most relevant parameters controlling the performance of a DME fueled engine. Piston bowl geometry is found to primarily influence heat transfer and combustion efficiency due to its impact on the surface area and fuel distribution, respectively. Mixing is most affected by the injection system parameters. Finally, the optimum DME engine configuration provides 6.9% absolute net indicated efficiency improvement over the baseline engine fueled with DME. This study confirms the potential of DME as a promising fuel for the future generation of compression ignition engines and demonstrates the need to co-optimize the fuel and combustion system.

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Section: Introductionmentioning

confidence: 93%

Computational optimization of the combustion system of a heavy duty direct injection diesel engine operating with dimethyl-ether

Benajes

Pastor

Hernández-López

et al. 2018

Fuel

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“…If the side effects of the incylinder modification techniques are properly addressed, these techniques will play a major role in the reduction of pollutants of CI engine. Higher NOx emission and higher smoke emission are the two major side effects during the incylinder modification methods of retarding and advancing the fuel injection timing respectively as reported by researchers during their investigation [1][2][3][4][5][6][7][8][9]. Higher NOx emission resulted through advanced fuel injection timing can be reduced by introducing EGR.…”

Section: Introductionmentioning

confidence: 81%

“…Several investigations were carried out to reduce the pollutants and the attempts are still in progress [1][2][3][4][5][6][7][8][9]. Incylinder control techniques are quite useful in reducing the pollutants of a CI engine since they are economical when compared to treatment of exhaust gases [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of EGR at advanced injection timing on combustion characteristics of diesel engine

Saravanan

2015

Alexandria Engineering Journal

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In the present work effect of EGR at advanced injection on combustion characteristics of a diesel engine was investigated. A 4.4 kW stationary diesel engine was used in this work and test was conducted at different percentage of EGR at advanced fuel injection timing. When compared to standard injection timing longer delay period, higher cylinder peak pressure, higher maximum heat release rate and shorter combustion duration were observed at advanced injection timing. When exhaust gases were recycled into the combustion chamber at advanced injection timing, delay period, peak pressure, MHRR and combustion duration were found to be increased than those of measured without EGR. ª 2015 Production and hosting by Elsevier B.V. on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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“…For that reason, new strategies for low NOx emissions and high efficiency can be tested with the new fuel that would not be possible to apply to a diesel fueled engine due to soot restrictions. These conclusions were tested experimentally by Park et al [18].…”

mentioning

confidence: 93%

Computational optimization of a combustion system for a stoichiometric DME fueled compression ignition engine

Benajes

Pastor

Hernández-López

et al. 2018

Fuel

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An optimization methodology based on a genetic algorithm coupled with the KIVA computational fluid dynamics (CFD) code is applied to the design of a combustion system of a heavy-duty diesel engine fueled with dimethyl ether (DME) and working with stoichiometric combustion in order to equip the system with a three way catalyst (TWC) to control the NOx emissions. The target of the optimization is to improve net indicated efficiency (NIE) while keeping NOx emissions, peak pressure and pressure rise rate under the reference engine levels. The results of the study provide an optimum configuration that offers a 0.6% NIE improvement while satisfying the restrictions and offering NOx values lower than 1% of the original emissions. Due to the methodology, not only the optimum combustion system configuration is presented, but also the cause-effect relation of the most relevant inputs with the optimization outputs are identified and analyzed. The new geometry shape reduced heat transfer losses by minimizing the surface area. Injection pressure and swirl proved to be key parameters necessary to overcome the increased mixing requirements of stoichiometric operation. EGR was found to simultaneously increase NIE while controlling NOx emissions. The results show the potential of stoichiometric compression ignition operation using DME as a promising pathway to maintain diesel-like efficiency, while achieving near zero NOx and soot emissions.

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Injection strategy for simultaneous reduction of NOx and soot emissions using two-stage injection in DME fueled engine

Cited by 56 publications

References 41 publications

Computational optimization of the combustion system of a heavy duty direct injection diesel engine operating with dimethyl-ether

Computational optimization of the combustion system of a heavy duty direct injection diesel engine operating with dimethyl-ether

Effect of EGR at advanced injection timing on combustion characteristics of diesel engine

Computational optimization of a combustion system for a stoichiometric DME fueled compression ignition engine

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