On the effects of flow pulsation upon the performance of flow deflector for catalytic converter

In automobile-exhaust systems, catalytic converters are the main components to produce substantial pressure drops, which induce engine-power loss and fuel-consumption rise. In addition to the need to reduce the pressure loss, the flow passing through the catalytic substrate should be as uniform as p...

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Autores principales:	Katsuya HIRATA, Shinya TANAKA, Masaya OTA, Taishi INOUE, Tomohiro OZAKI, Hirochika TANIGAWA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	catalytic converter diffuser pressure loss pressure drop pulsating flow velocity profile automotive exhaust system Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/2838d2bc688b426cb239e1d339d1eb23
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spelling	oai:doaj.org-article:2838d2bc688b426cb239e1d339d1eb232021-11-26T07:12:45ZOn the effects of flow pulsation upon the performance of flow deflector for catalytic converter2187-974510.1299/mej.16-00665https://doaj.org/article/2838d2bc688b426cb239e1d339d1eb232017-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/6/4_16-00665/_pdf/-char/enhttps://doaj.org/toc/2187-9745In automobile-exhaust systems, catalytic converters are the main components to produce substantial pressure drops, which induce engine-power loss and fuel-consumption rise. In addition to the need to reduce the pressure loss, the flow passing through the catalytic substrate should be as uniform as possible, which provides a uniform thermal distribution and high catalytic-conversion efficiency. The authors have reported that a flow deflector placed inside a catalytic-converter diffuser part can drastically reduce the pressure loss and improve the velocity-profile uniformity in comparison with the no-flow-deflector case (Hirata et al., 2006 & 2008). In those reports, the authors' concern is restricted only to steady flow, due to the authors' intention to reveal fundamental features precisely under a simple and general condition. On the other hand, actual exhaust flows often include various pulsative components. So, the authors investigate the effects of flow pulsation upon the flow-deflector performances such as the pressure-loss reduction and the flow-uniformity improvement. As a result, the authors reveal that the flow deflector can reduce the pressure loss and improve the velocity-profile uniformity in comparison with the no-flow-deflector case, even for pulsating flow as well as steady flow.Katsuya HIRATAShinya TANAKAMasaya OTATaishi INOUETomohiro OZAKIHirochika TANIGAWAThe Japan Society of Mechanical Engineersarticlecatalytic converterdiffuserpressure losspressure droppulsating flowvelocity profileautomotive exhaust systemMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 6, Pp 16-00665-16-00665 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	catalytic converter diffuser pressure loss pressure drop pulsating flow velocity profile automotive exhaust system Mechanical engineering and machinery TJ1-1570
spellingShingle	catalytic converter diffuser pressure loss pressure drop pulsating flow velocity profile automotive exhaust system Mechanical engineering and machinery TJ1-1570 Katsuya HIRATA Shinya TANAKA Masaya OTA Taishi INOUE Tomohiro OZAKI Hirochika TANIGAWA On the effects of flow pulsation upon the performance of flow deflector for catalytic converter
description	In automobile-exhaust systems, catalytic converters are the main components to produce substantial pressure drops, which induce engine-power loss and fuel-consumption rise. In addition to the need to reduce the pressure loss, the flow passing through the catalytic substrate should be as uniform as possible, which provides a uniform thermal distribution and high catalytic-conversion efficiency. The authors have reported that a flow deflector placed inside a catalytic-converter diffuser part can drastically reduce the pressure loss and improve the velocity-profile uniformity in comparison with the no-flow-deflector case (Hirata et al., 2006 & 2008). In those reports, the authors' concern is restricted only to steady flow, due to the authors' intention to reveal fundamental features precisely under a simple and general condition. On the other hand, actual exhaust flows often include various pulsative components. So, the authors investigate the effects of flow pulsation upon the flow-deflector performances such as the pressure-loss reduction and the flow-uniformity improvement. As a result, the authors reveal that the flow deflector can reduce the pressure loss and improve the velocity-profile uniformity in comparison with the no-flow-deflector case, even for pulsating flow as well as steady flow.
format	article
author	Katsuya HIRATA Shinya TANAKA Masaya OTA Taishi INOUE Tomohiro OZAKI Hirochika TANIGAWA
author_facet	Katsuya HIRATA Shinya TANAKA Masaya OTA Taishi INOUE Tomohiro OZAKI Hirochika TANIGAWA
author_sort	Katsuya HIRATA
title	On the effects of flow pulsation upon the performance of flow deflector for catalytic converter
title_short	On the effects of flow pulsation upon the performance of flow deflector for catalytic converter
title_full	On the effects of flow pulsation upon the performance of flow deflector for catalytic converter
title_fullStr	On the effects of flow pulsation upon the performance of flow deflector for catalytic converter
title_full_unstemmed	On the effects of flow pulsation upon the performance of flow deflector for catalytic converter
title_sort	on the effects of flow pulsation upon the performance of flow deflector for catalytic converter
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/2838d2bc688b426cb239e1d339d1eb23
work_keys_str_mv	AT katsuyahirata ontheeffectsofflowpulsationupontheperformanceofflowdeflectorforcatalyticconverter AT shinyatanaka ontheeffectsofflowpulsationupontheperformanceofflowdeflectorforcatalyticconverter AT masayaota ontheeffectsofflowpulsationupontheperformanceofflowdeflectorforcatalyticconverter AT taishiinoue ontheeffectsofflowpulsationupontheperformanceofflowdeflectorforcatalyticconverter AT tomohiroozaki ontheeffectsofflowpulsationupontheperformanceofflowdeflectorforcatalyticconverter AT hirochikatanigawa ontheeffectsofflowpulsationupontheperformanceofflowdeflectorforcatalyticconverter
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On the effects of flow pulsation upon the performance of flow deflector for catalytic converter

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