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Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection
•We analyze in- and near-nozzle dynamics of single- and multi-hole diesel injectors.•An X-ray imaging technique was applied for analysis of dynamic characteristics.•Number of nozzle holes significantly changes the transient needle behavior.•Near-nozzle flow characteristics are highly affected by the...
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Published in: | Fuel (Guildford) 2015-06, Vol.150 (C), p.112-122 |
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creator | Moon, Seoksu Gao, Yuan Park, Suhan Wang, Jin Kurimoto, Naoki Nishijima, Yoshiaki |
description | •We analyze in- and near-nozzle dynamics of single- and multi-hole diesel injectors.•An X-ray imaging technique was applied for analysis of dynamic characteristics.•Number of nozzle holes significantly changes the transient needle behavior.•Near-nozzle flow characteristics are highly affected by the hole arrangement.•Multi-hole nozzles generate turbulent initial flow with faster mixing at downstream.
Despite the fact that all modern diesel engines use multi-hole injectors, single-hole injectors are frequently used to understand the fundamental properties of high-pressure diesel injections due to their axisymmetric design of the injector nozzles. A multi-hole injector accommodates many holes around the nozzle axis to deliver adequate amount of fuel with small orifices. The off-axis arrangement of the multi-hole injectors significantly alters the inter- and near-nozzle flow patterns compared to those of the single-hole injectors. This study compares the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole (3-hole and 6-hole) diesel injectors to understand how the difference in hole arrangement and number affects the initial flow development of the diesel injectors. A propagation-based X-ray phase-contrast imaging technique was applied to compare the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole injectors. The comparisons were made by dividing the entire injection process by three sub-stages: opening-transient, quasi-steady and closing-transient. |
doi_str_mv | 10.1016/j.fuel.2015.01.097 |
format | article |
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Despite the fact that all modern diesel engines use multi-hole injectors, single-hole injectors are frequently used to understand the fundamental properties of high-pressure diesel injections due to their axisymmetric design of the injector nozzles. A multi-hole injector accommodates many holes around the nozzle axis to deliver adequate amount of fuel with small orifices. The off-axis arrangement of the multi-hole injectors significantly alters the inter- and near-nozzle flow patterns compared to those of the single-hole injectors. This study compares the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole (3-hole and 6-hole) diesel injectors to understand how the difference in hole arrangement and number affects the initial flow development of the diesel injectors. A propagation-based X-ray phase-contrast imaging technique was applied to compare the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole injectors. The comparisons were made by dividing the entire injection process by three sub-stages: opening-transient, quasi-steady and closing-transient.</description><identifier>ISSN: 0016-2361</identifier><identifier>EISSN: 1873-7153</identifier><identifier>DOI: 10.1016/j.fuel.2015.01.097</identifier><language>eng</language><publisher>United Kingdom: Elsevier Ltd</publisher><subject>High-pressure diesel spray ; Near-nozzle flow ; Needle motion ; Nozzle hole arrangement ; Nozzle hole number ; X-ray phase-contrast imaging</subject><ispartof>Fuel (Guildford), 2015-06, Vol.150 (C), p.112-122</ispartof><rights>2015 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c437t-543d76c770ccf66e1a51f95b9261ff8263437eee6406aa76576df1a4a50b0aca3</citedby><cites>FETCH-LOGICAL-c437t-543d76c770ccf66e1a51f95b9261ff8263437eee6406aa76576df1a4a50b0aca3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,27903,27904</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/1247734$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Moon, Seoksu</creatorcontrib><creatorcontrib>Gao, Yuan</creatorcontrib><creatorcontrib>Park, Suhan</creatorcontrib><creatorcontrib>Wang, Jin</creatorcontrib><creatorcontrib>Kurimoto, Naoki</creatorcontrib><creatorcontrib>Nishijima, Yoshiaki</creatorcontrib><title>Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection</title><title>Fuel (Guildford)</title><description>•We analyze in- and near-nozzle dynamics of single- and multi-hole diesel injectors.•An X-ray imaging technique was applied for analysis of dynamic characteristics.•Number of nozzle holes significantly changes the transient needle behavior.•Near-nozzle flow characteristics are highly affected by the hole arrangement.•Multi-hole nozzles generate turbulent initial flow with faster mixing at downstream.
Despite the fact that all modern diesel engines use multi-hole injectors, single-hole injectors are frequently used to understand the fundamental properties of high-pressure diesel injections due to their axisymmetric design of the injector nozzles. A multi-hole injector accommodates many holes around the nozzle axis to deliver adequate amount of fuel with small orifices. The off-axis arrangement of the multi-hole injectors significantly alters the inter- and near-nozzle flow patterns compared to those of the single-hole injectors. This study compares the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole (3-hole and 6-hole) diesel injectors to understand how the difference in hole arrangement and number affects the initial flow development of the diesel injectors. A propagation-based X-ray phase-contrast imaging technique was applied to compare the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole injectors. The comparisons were made by dividing the entire injection process by three sub-stages: opening-transient, quasi-steady and closing-transient.</description><subject>High-pressure diesel spray</subject><subject>Near-nozzle flow</subject><subject>Needle motion</subject><subject>Nozzle hole arrangement</subject><subject>Nozzle hole number</subject><subject>X-ray phase-contrast imaging</subject><issn>0016-2361</issn><issn>1873-7153</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LAzEQxYMoWKtfwFPwnjXZ3SQteJHiPyh40XNIsxM2yzYpSSq0n96s7dnTwMz7vXk8hO4ZrRhl4nGo7B7GqqaMV5RVdCkv0IwtZEMk480lmtGiInUj2DW6SWmglMoFb2cov1gLJuNgce4B-_12AxFr3-FdSC674KeTD8fjCLgPIyRcVs6TP40HHcn52B283jqDTa-jNhmiS9mZNOGdgwRjoYbyqljeoiurxwR35zlH368vX6t3sv58-1g9r4lpG5kJb5tOCiMlNcYKAUxzZpd8s6wFs3ZRi6bIAEC0VGgtBZeis0y3mtMN1UY3c_Rw8g0likrGZTC9Cd6XGIrVrZTFYY7qk8jEkFIEq3bRbXU8KEbVVK4a1FSumspVlKlSboGeThCU-D8O4uQO3kDn4mTeBfcf_gt7oYRW</recordid><startdate>20150615</startdate><enddate>20150615</enddate><creator>Moon, Seoksu</creator><creator>Gao, Yuan</creator><creator>Park, Suhan</creator><creator>Wang, Jin</creator><creator>Kurimoto, Naoki</creator><creator>Nishijima, Yoshiaki</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20150615</creationdate><title>Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection</title><author>Moon, Seoksu ; Gao, Yuan ; Park, Suhan ; Wang, Jin ; Kurimoto, Naoki ; Nishijima, Yoshiaki</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c437t-543d76c770ccf66e1a51f95b9261ff8263437eee6406aa76576df1a4a50b0aca3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>High-pressure diesel spray</topic><topic>Near-nozzle flow</topic><topic>Needle motion</topic><topic>Nozzle hole arrangement</topic><topic>Nozzle hole number</topic><topic>X-ray phase-contrast imaging</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Moon, Seoksu</creatorcontrib><creatorcontrib>Gao, Yuan</creatorcontrib><creatorcontrib>Park, Suhan</creatorcontrib><creatorcontrib>Wang, Jin</creatorcontrib><creatorcontrib>Kurimoto, Naoki</creatorcontrib><creatorcontrib>Nishijima, Yoshiaki</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Fuel (Guildford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Moon, Seoksu</au><au>Gao, Yuan</au><au>Park, Suhan</au><au>Wang, Jin</au><au>Kurimoto, Naoki</au><au>Nishijima, Yoshiaki</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection</atitle><jtitle>Fuel (Guildford)</jtitle><date>2015-06-15</date><risdate>2015</risdate><volume>150</volume><issue>C</issue><spage>112</spage><epage>122</epage><pages>112-122</pages><issn>0016-2361</issn><eissn>1873-7153</eissn><abstract>•We analyze in- and near-nozzle dynamics of single- and multi-hole diesel injectors.•An X-ray imaging technique was applied for analysis of dynamic characteristics.•Number of nozzle holes significantly changes the transient needle behavior.•Near-nozzle flow characteristics are highly affected by the hole arrangement.•Multi-hole nozzles generate turbulent initial flow with faster mixing at downstream.
Despite the fact that all modern diesel engines use multi-hole injectors, single-hole injectors are frequently used to understand the fundamental properties of high-pressure diesel injections due to their axisymmetric design of the injector nozzles. A multi-hole injector accommodates many holes around the nozzle axis to deliver adequate amount of fuel with small orifices. The off-axis arrangement of the multi-hole injectors significantly alters the inter- and near-nozzle flow patterns compared to those of the single-hole injectors. This study compares the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole (3-hole and 6-hole) diesel injectors to understand how the difference in hole arrangement and number affects the initial flow development of the diesel injectors. A propagation-based X-ray phase-contrast imaging technique was applied to compare the transient needle motion and near-nozzle flow characteristics of the single- and multi-hole injectors. The comparisons were made by dividing the entire injection process by three sub-stages: opening-transient, quasi-steady and closing-transient.</abstract><cop>United Kingdom</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.fuel.2015.01.097</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record> |
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source | ScienceDirect Freedom Collection |
subjects | High-pressure diesel spray Near-nozzle flow Needle motion Nozzle hole arrangement Nozzle hole number X-ray phase-contrast imaging |
title | Effect of the number and position of nozzle holes on in- and near-nozzle dynamic characteristics of diesel injection |
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