Experimental investigation of fuel temperature effects on transient needle motion and injection velocity of solenoid type diesel injector

Bae, Gyuhan; Choi, Sungsik; Lee, Sanggwon; Moon, Seoksu; Wang, Jin; Kim, Kihyun; Lee, Jinwoo; Kang, Jinsuk

doi:10.1016/j.ijheatmasstransfer.2021.121838

Title: Experimental investigation of fuel temperature effects on transient needle motion and injection velocity of solenoid type diesel injector

Journal Article · Mon Aug 23 00:00:00 EDT 2021 · International Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2021.121838· OSTI ID:1897893

Bae, Gyuhan ^[1]; Choi, Sungsik ^[1]; Lee, Sanggwon ^[1]; Moon, Seoksu ^[1]; Wang, Jin ^[2]; Kim, Kihyun ^[3]; Lee, Jinwoo ^[4]; Kang, Jinsuk ^[5]

Inha University, Incheon (Korea, Republic of)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Silla University, Busan (Korea, Republic of)
Ulsan College (Korea, Republic of)
Hyundai Motors Company, Seoul (Korea, Republic of)

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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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1897893

Alternate ID(s):: OSTI ID: 1868684

Journal Information:: International Journal of Heat and Mass Transfer, Vol. 181; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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diesel injector
fuel temperature
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Title: Experimental investigation of fuel temperature effects on transient needle motion and injection velocity of solenoid type diesel injector

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