Analysis of the Aftertreatment Sizing for Pre-Turbo DPF and DOC Exhaust Line Configurations

Serrano, José Ramón; Guardiola, Carlos; Angiolini, Emanuele

doi:10.4271/2014-01-1498

Cited by 11 publications

(11 citation statements)

References 18 publications

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“…The result is a reduction in CO emission higher than 14% with the underfloor DOC placed upstream of the VGT and without close-coupled DOC. It highlights the potential for faster DOC light-off and volume reduction [32]. Similar results are obtained with respect to HC emission, which is shown in Figure 6(b).…”

Section: New European Driving Cyclesupporting

confidence: 75%

Experimental assessment of a pre-turbo aftertreatment configuration in a single stage turbocharged diesel engine. Part 2: Transient operation

Luján

Serrano

Piqueras

et al. 2015

Energy

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Section: New European Driving Cyclesupporting

confidence: 75%

Experimental assessment of a pre-turbo aftertreatment configuration in a single stage turbocharged diesel engine. Part 2: Transient operation

Luján

Serrano

Piqueras

et al. 2015

Energy

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“…The comparison evidences the good agreement with experimental data. The complete validation of the engine modelling is described in detail in [21]. Plots (c) and (d) shown in Figure 9 represent the modelled instantaneous VGT efficiency as a function of the blade speed ratio.…”

Section: Temperature and Vgt Operating Conditionsmentioning

confidence: 99%

Experimental assessment of pre-turbo aftertreatment configurations in a single stage turbocharged diesel engine. Part 1: Steady-state operation

Luján

Bermúdez

Piqueras

et al. 2015

Energy

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Elsevier Luján, JM.; Bermúdez, V.; Piqueras, P.; Garcia Afonso, O. (2015). Experimental assessment of pre-turbo aftertreatment configurations in a single stage turbocharged diesel engine. AbstractDiesel oxidation catalysts and diesel particulate filters are standard aftertreatment systems in Diesel engines which are traditionally placed downstream of the turbine. However, pre-turbo aftertreatment configurations are being approached as a way to improve the aftertreatment performance in terms of light-off and passive regeneration. This exhaust line architecture can also benefit fuel economy. The objective of this work is to analyse experimentally how the pre-turbo aftertreatment placement impacts on the performance of a single stage turbocharged Diesel engine.The work has been divided into two parts focused on steady-state and transient engine operation separately. The first part comprises the analysis of the experimental results corresponding to steady-state operating conditions. The range of operation covers different engine loads and speeds. The engine response with pre-turbo aftertreatment placement is mainly affected by the change in the pumping work caused by the aftertreatment pressure drop reduction and its new location, which avoids the multiplicative effect of the turbine expansion ratio when setting the engine back-pressure. These effects become more significant as the engine load increases benefiting fuel consumption from low to high loads. Concerning aftertreatment performance, the results evidence noticeable benefits in DPF passive regeneration and CO/HC emissions reduction at low engine load.

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“…In post-turbine DPF placement, previous studies (Serrano et al (2014a)) revealed that the pressure drop, and hence fuel consumption, is very sensitive to volume reduction. In addition, the reduction of volume based on diameter variation is much more damaging than the based on monolith length reduction mainly because of the increasing inertial contribution to pressure drop (Serrano et al (2014b)). The penalty in pressure drop might be counteracted increasing the cell density, i.e.…”

Section: Introductionmentioning

confidence: 99%

On the impact of DPF downsizing and cellular geometry on filtration efficiency in pre- and post-turbine placement

Serrano

Bermúdez

Angiolini

2017

Journal of Aerosol Science

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The use of aftertreatment systems in reciprocating internal combustion engines is currently mandatory in order to comply worldwide with emission standards. Among these systems, the wall-flow diesel particulate filter (DPF) is in charge of the particulate matter removal. The DPF is conventionally placed downstream of the turbine. However, its placement upstream of the turbine is growing in interest because of the benefits in specific fuel consumption, passive regeneration and aptitude to downsizing. In the current work an in-house 1D wall-flow DPF model is applied to evaluate the effect of the DPF downsizing on filtration efficiency. Both pre-and post-turbine placement are considered in presence of clean and soot loaded substrates. Volume reduction is approached considering diameter and length variation. In parallel, the cell density is also varied modifying the meso-geometry, i.e. cell size and porous wall thickness, imposing constant thermal integrity factor. The sensitivity to this last parameter is also analysed being its influence of second order in comparison to volume and cellular geometry effects. The lower Peclet number in the pre-turbine placement leads to higher filtration efficiency than post-turbine location comparing at the same DPF volume. Diameter based volume reduction provides slightly better results in filtration efficiency because of the way the filtration velocity field is varied. This general behaviour involves additional advantages to the potential for volume reduction of pre-turbine DPFs. Thus, different strategies with boundaries defined by volume reduction at constant filtration area or at constant specific filtration area can be approached looking for the best balance between fuel economy reduction and filtration efficiency increase with pre-turbine DPF placement.

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Analysis of the Aftertreatment Sizing for Pre-Turbo DPF and DOC Exhaust Line Configurations

Cited by 11 publications

References 18 publications

Experimental assessment of a pre-turbo aftertreatment configuration in a single stage turbocharged diesel engine. Part 2: Transient operation

Experimental assessment of a pre-turbo aftertreatment configuration in a single stage turbocharged diesel engine. Part 2: Transient operation

Experimental assessment of pre-turbo aftertreatment configurations in a single stage turbocharged diesel engine. Part 1: Steady-state operation

On the impact of DPF downsizing and cellular geometry on filtration efficiency in pre- and post-turbine placement

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