TY - BOOK
T1 - An experimental and predictive study of the flow field in axisymmetric automotive exhaust catalyst systems
AU - Benjamin, Stephen F.
AU - Clarkson, R.J.
AU - Haimad, N.
AU - Girgis, N.S.
N1 - Copyright © 1996 SAE International. This paper is posted on this site with permission from SAE International and is for viewing only. It may not be stored on any additional repositories or retrieval systems. Further use or distribution is not permitted without permission from SAE.
PY - 1996
Y1 - 1996
N2 - An experimental and theoretical investigation has been performed on the flow and pressure loss in axisymmetric catalytic converters and isolated monoliths under steady, isothermal flow conditions. Monolith resistance has been measured with a uniform, low turbulence, incident flow field. It has been found that the pressure loss expression for fully developed laminar flow is a good approximation to observations for x+ greater than 0.2. However, for x+ less than 0.2 the additional pressure loss due to developing flow is no longer negligible and a better approach is to use the correlation proposed by Shah. From experimental studies on the axisymmetric catalytic converters non-dimensional power law relationships have been derived relating maldistribution and pressure drop to expansion length, Re, and monolith length. These expressions are shown to generally fit the data well within ±5%. CFD predictions of the flow for a wide range of geometric configurations and flow conditions have shown that generally the system non-dimensional pressure loss can be predicted to within about 10% but that the maldistribution index is underpredicted within a range of 9-17.5%. It is believed that the pressure loss expression derived from 1-D flow studies is too simplistic. CFD predictions do, however, show the same pattern of change as observed experimentally and hence their performance in prediction trends is quite encouraging.
Publisher statement: Copyright © 1996 SAE International. This paper is posted on this site with permission from SAE International and is for viewing only. It may not be stored on any additional repositories or retrieval systems. Further use or distribution is not permitted without permission from SAE.
AB - An experimental and theoretical investigation has been performed on the flow and pressure loss in axisymmetric catalytic converters and isolated monoliths under steady, isothermal flow conditions. Monolith resistance has been measured with a uniform, low turbulence, incident flow field. It has been found that the pressure loss expression for fully developed laminar flow is a good approximation to observations for x+ greater than 0.2. However, for x+ less than 0.2 the additional pressure loss due to developing flow is no longer negligible and a better approach is to use the correlation proposed by Shah. From experimental studies on the axisymmetric catalytic converters non-dimensional power law relationships have been derived relating maldistribution and pressure drop to expansion length, Re, and monolith length. These expressions are shown to generally fit the data well within ±5%. CFD predictions of the flow for a wide range of geometric configurations and flow conditions have shown that generally the system non-dimensional pressure loss can be predicted to within about 10% but that the maldistribution index is underpredicted within a range of 9-17.5%. It is believed that the pressure loss expression derived from 1-D flow studies is too simplistic. CFD predictions do, however, show the same pattern of change as observed experimentally and hence their performance in prediction trends is quite encouraging.
Publisher statement: Copyright © 1996 SAE International. This paper is posted on this site with permission from SAE International and is for viewing only. It may not be stored on any additional repositories or retrieval systems. Further use or distribution is not permitted without permission from SAE.
KW - automotive
KW - computational fluid dynamics
KW - emissions
KW - exhaust emissions
KW - catalytic converters
U2 - 10.4271/961208
DO - 10.4271/961208
M3 - Other report
T3 - SAE Technical Papers
BT - An experimental and predictive study of the flow field in axisymmetric automotive exhaust catalyst systems
PB - SAE
ER -