Effects of low-pressure EGR on gaseous emissions and particle size distribution from a dual-mode dual-fuel (DMDF) concept in a medium-duty engine

Macián, Vicente; Bermúdez, Vicente; Villalta, David; Soto, Lian

doi:10.1016/j.applthermaleng.2019.114245

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…Recently, several investigations on the engine hardware [6] [7], combustion concepts [8] [9], and electric powertrain coupling [10] [11] have made considerable progress in achieving the objectives of reducing emissions without penalizing the performance. However, these advancements by themselves will not be enough in the long term.…”

Section: Introductionmentioning

confidence: 99%

Methanol and OMEx as fuel candidates to fulfill the potential EURO VII emissions regulation under dual-mode dual-fuel combustion

García

Monsalve‐Serrano

Villalta

et al. 2021

Fuel

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Section: Introductionmentioning

confidence: 99%

Methanol and OMEx as fuel candidates to fulfill the potential EURO VII emissions regulation under dual-mode dual-fuel combustion

García

Monsalve‐Serrano

Villalta

et al. 2021

Fuel

Self Cite

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“…In this way, one can shift away from fossil fuels and reduce the carbon footprint of this technology. However, possible downsides come along with the early fuel injection and mixing, like emissions of unburned hydrocarbons (UHC) or CO, especially under non-optimal engine conditions [1,[3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A novel technique for detailed and time-efficient combustion modeling of fumigated dual-fuel internal combustion engines

Decan

Lucchini

Verhelst

2020

Applied Thermal Engineering

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The present work details a study of the 3D-modeling of dual-fuel engines, with a specific focus on medium speed marine engines. These operate under the fumigated approach, which means that the second fuel, which replaces most of the diesel fuel, is added in the intake duct. This type of engine requires the least amount of modifications to the current medium speed diesel engine and is therefore an ideal retrofit solution to tackle global warming and local air quality issues. In this work, the operation of such an engine has been modeled, with special care for the combustion modeling. Namely, it comprises both auto-ignition of the diesel pilot, and flame propagation in the premixed fuel-air mixture. A tabulated kinetics approach, currently being used to model diesel operation, has been extended to include this flame propagation. Both a Coherent Flame Model (CFM) and a Flame Surface Wrinkling Model (FSWM) have been implemented to handle this premixed combustion mode. Coupling a flame propagation model to the tabulated chemistry should provide a practical way of capturing both the complex dual-fuel combustion process as the chemistry information, while maintaining an acceptable computation time. Additionally, a tabulated laminar flame speed method has also been implemented. Experimental results were obtained on the operation of a medium-speed engine in diesel, natural gas/diesel dual-fuel and methanol/diesel dual-fuel mode, under varying operating loads and speeds. Results have been compared to the ones obtained from the simulations performed in OpenFOAM with the dedicated combustion modeling technique. It was found that while both FSWM and CFM capture some physical trends, they are currently not able of capturing the dual-fuel combustion process in total.Improvements with regards to the ignition and mixing-controlled combustion modeling are necessary, since the current approach is not able of fully capturing the dual-fuel phenomena. This work however provides insight in the complex combustion process and serves as a basis for further developments. It can also be used as an initial engine development tool for fast calculation and optimization of dual-fuel operation.

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“…The use of cooled exhaust gas recirculation (EGR) is an essential feature of CI engines, as it delivers significant reduction of nitrogen oxide emissions [6]. One issue of EGR modules (i.e.…”

Section: Introductionmentioning

confidence: 99%

Online Monitoring Solutions of Efficiency for Automotive EGR Heat Exchangers

et al. 2020

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Internal combustion engines are the dominating technology in the automotive transport sector. Within this context, even incremental improvements in efficiency are essential for reducing overall environmental impact. Maintaining rated specifications is also an important issue, with monitoring solutions being more and more the focus of development. Cooled exhaust gas recirculation (EGR) is a well established technology that allows improvements in efficiency and reduction of emissions. The present work looks at different solutions focused on the integration of a digital sensor directly into EGR valves, thus ensuring continuous monitoring and extensive diagnostics. As an initial stage, an evaluation of gas cooling efficiency was performed and different routes were identified to allow this parameter to be monitored online. Measurement of flow was discarded as a solution, mainly due to cost issues and complications of its application. Temperature based evaluation of efficiency was found to ensure the best compromise, with acceptable accuracy and practically no integration difficulties. This initial evaluation allowed the definition of basic principles of operation for the sensor, so as to ensure the final goal of more efficient and longerlasting EGR modules through continuous performance monitoring.

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Effects of low-pressure EGR on gaseous emissions and particle size distribution from a dual-mode dual-fuel (DMDF) concept in a medium-duty engine

Cited by 11 publications

References 43 publications

Methanol and OMEx as fuel candidates to fulfill the potential EURO VII emissions regulation under dual-mode dual-fuel combustion

Methanol and OMEx as fuel candidates to fulfill the potential EURO VII emissions regulation under dual-mode dual-fuel combustion

A novel technique for detailed and time-efficient combustion modeling of fumigated dual-fuel internal combustion engines

Online Monitoring Solutions of Efficiency for Automotive EGR Heat Exchangers

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