TY - JOUR
T1 - Gasoline Particulate Filter wall permeability testing
AU - Aleksandrova, Svetlana
AU - Saul, Jonathan
AU - Medina, Humberto
AU - Garcia-Afonso, Oscar
AU - Lin, Chunxing
AU - Herreros, Jose Martin
AU - Bevan, Mark
AU - Benjamin, Stephen
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This document is the author’s post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.
PY - 2018/10/29
Y1 - 2018/10/29
N2 - With the introduction of particulate matter emissions regulations forgasoline engines, most car manufacturers are considering usingGasoline Particulate Filters (GPF). Although very similar to DieselParticulate Filters (DPF), GPFs operate at higher temperatures andgenerally have thinner monolith walls. In order to estimate thepressure loss through the filter, filter wall permeability is needed.This presents a number of challenges since wall losses cannot beefficiently isolated from other losses in a full scale filter or filter core.Thin wall wafers have been used for DPF characterisation. However,GPF wafers are generally thinner, which makes the testing lessstraightforward. This paper presents a novel effective methodologyfor estimation of GPF wall permeability using thin wafers cut fromthe filter monolith. Both cold and hot flow permeability can beestimated, which allows to account for the change of apparentpermeability due to the slip effect. The flow through the wafer is alsomodelled numerically to assess the effect of the uneven wafer surfaceresulting from wafer preparation method. A technique for calculatingcorrected permeability is suggested which is estimated to providevalues within 5% of the "nominal" value. Combining experimentalresults with the applied correction, consistent permeability valueshave been obtained for seven wafer samples. Maximum variation inthe permeability values was 10%, with a standard error of ±2.5% ofthe mean. Being able to assess filter wall permeability from a simplecold flow pressure testing procedure will allow development of moreefficient flow and pressure loss models for Gasoline ParticulateFilters, which in turn will facilitate design of efficient aftertreatmentsystems with lower back pressure.
AB - With the introduction of particulate matter emissions regulations forgasoline engines, most car manufacturers are considering usingGasoline Particulate Filters (GPF). Although very similar to DieselParticulate Filters (DPF), GPFs operate at higher temperatures andgenerally have thinner monolith walls. In order to estimate thepressure loss through the filter, filter wall permeability is needed.This presents a number of challenges since wall losses cannot beefficiently isolated from other losses in a full scale filter or filter core.Thin wall wafers have been used for DPF characterisation. However,GPF wafers are generally thinner, which makes the testing lessstraightforward. This paper presents a novel effective methodologyfor estimation of GPF wall permeability using thin wafers cut fromthe filter monolith. Both cold and hot flow permeability can beestimated, which allows to account for the change of apparentpermeability due to the slip effect. The flow through the wafer is alsomodelled numerically to assess the effect of the uneven wafer surfaceresulting from wafer preparation method. A technique for calculatingcorrected permeability is suggested which is estimated to providevalues within 5% of the "nominal" value. Combining experimentalresults with the applied correction, consistent permeability valueshave been obtained for seven wafer samples. Maximum variation inthe permeability values was 10%, with a standard error of ±2.5% ofthe mean. Being able to assess filter wall permeability from a simplecold flow pressure testing procedure will allow development of moreefficient flow and pressure loss models for Gasoline ParticulateFilters, which in turn will facilitate design of efficient aftertreatmentsystems with lower back pressure.
KW - Aftertreatment
KW - Particulate Matter
KW - Particulate Filter
KW - GPF
KW - DPF
KW - Pressure Loss
U2 - 10.4271/03-11-05-0039
DO - 10.4271/03-11-05-0039
M3 - Article
SN - 1946-3944
VL - 11
SP - 571
EP - 584
JO - SAE International Journal of Engines
JF - SAE International Journal of Engines
IS - 5
M1 - SAE 03-11-05-0039
ER -