Experimental investigation of fuel temperature effects on transient needle motion and injection velocity of solenoid type diesel injector
Real driving emission (RDE) test conducted in sub-zero temperature conditions has been acting as a severe emission regulation over the existing test methods for diesel engines. In order to cope with this tightened regulation, many studies have been conducted to interpret the factors causing the dete...
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Published in | International journal of heat and mass transfer Vol. 181 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
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United States
Elsevier
23.08.2021
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Abstract | Real driving emission (RDE) test conducted in sub-zero temperature conditions has been acting as a severe emission regulation over the existing test methods for diesel engines. In order to cope with this tightened regulation, many studies have been conducted to interpret the factors causing the deteriorated diesel engine combustion in cold operation conditions. The deteriorated fuel injection performance has been regarded as one of the key contributing factors but the governing mechanisms are not thoroughly understood so far. This study aims to provide a comprehensive understanding of the effects of fuel temperature including sub-zero conditions on fuel injection performance by measuring the transient needle motion and injection velocity of a diesel injector using synchrotron X-ray imaging techniques. Here, the factors causing the deteriorated injector performance and their contributions are discussed thoroughly based on the results. The results showed that the injection duration was shortened as the fuel temperature decreased as a result of decreased needle opening speed and increased needle closing speed. The increase of fuel viscosity and bulk modulus was discussed as the main factors associated with these results. The total injection mass was reduced by lowering the fuel temperature not only by the shortened injection duration but also by the decreased injection velocity. These factors exerted near equivalent contribution to the reduced injection mass at low fuel temperatures. |
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AbstractList | Real driving emission (RDE) test conducted in sub-zero temperature conditions has been acting as a severe emission regulation over the existing test methods for diesel engines. In order to cope with this tightened regulation, many studies have been conducted to interpret the factors causing the deteriorated diesel engine combustion in cold operation conditions. The deteriorated fuel injection performance has been regarded as one of the key contributing factors but the governing mechanisms are not thoroughly understood so far. This study aims to provide a comprehensive understanding of the effects of fuel temperature including sub-zero conditions on fuel injection performance by measuring the transient needle motion and injection velocity of a diesel injector using synchrotron X-ray imaging techniques. Here, the factors causing the deteriorated injector performance and their contributions are discussed thoroughly based on the results. The results showed that the injection duration was shortened as the fuel temperature decreased as a result of decreased needle opening speed and increased needle closing speed. The increase of fuel viscosity and bulk modulus was discussed as the main factors associated with these results. The total injection mass was reduced by lowering the fuel temperature not only by the shortened injection duration but also by the decreased injection velocity. These factors exerted near equivalent contribution to the reduced injection mass at low fuel temperatures. |
Author | Bae, Gyuhan Lee, Jinwoo Choi, Sungsik Lee, Sanggwon Wang, Jin Kim, Kihyun Kang, Jinsuk Moon, Seoksu |
Author_xml | – sequence: 1 fullname: Bae, Gyuhan organization: Inha University, Incheon (Korea, Republic of) – sequence: 2 fullname: Choi, Sungsik organization: Inha University, Incheon (Korea, Republic of) – sequence: 3 fullname: Lee, Sanggwon organization: Inha University, Incheon (Korea, Republic of) – sequence: 4 fullname: Moon, Seoksu organization: Inha University, Incheon (Korea, Republic of) – sequence: 5 fullname: Wang, Jin organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS) – sequence: 6 fullname: Kim, Kihyun organization: Silla University, Busan (Korea, Republic of) – sequence: 7 fullname: Lee, Jinwoo organization: Ulsan College (Korea, Republic of) – sequence: 8 fullname: Kang, Jinsuk organization: Hyundai Motors Company, Seoul (Korea, Republic of) |
BackLink | https://www.osti.gov/servlets/purl/1897893$$D View this record in Osti.gov |
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Snippet | Real driving emission (RDE) test conducted in sub-zero temperature conditions has been acting as a severe emission regulation over the existing test methods... |
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SubjectTerms | diesel injector ENGINEERING fuel temperature injection velocity needle motion X-ray phase-contrast imaging |
Title | Experimental investigation of fuel temperature effects on transient needle motion and injection velocity of solenoid type diesel injector |
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