This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effects of positive or negative dwell times of split injection on diesel spray development and mixture formation processes
Technical Paper
2019-32-0596
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
An investigation on the effect of dwell time of split injection on a diesel spray evolution and mixture formation process was carried out. A commercial 7-hole injector were used in the experiment to eliminate the possible discrepancies on the spray with single-hole research injector. Laser absorption scattering (LAS) technique was implemented for the measurement of the temporal evolution of fuel evaporation and mixture concentration. The diesel surrogate fuel consists of n-tridecane and 2.5% of 1-methylnaphthalene in volume basis was used. The total amount of fuel injected was initially fixed to 5.0 mg/hole. A split ratio of 9: 1 in mass basis was selected according to the results obtained from a previous study. The dwell time was varied from 120 µs to a negative value of −50 µs. The effects of negative dwell time was not ideal for lean mixture formation when compared to zero or positive dwell time conditions. The collision of the spray tail of the first injection and the head of the second injection created locally rich pockets at the vicinity of the nozzle. Finally, injection rate shaping through modulating the pulses consisted of several injections of negative dwell times was investigated. This rate shaping strategy which showed a gradual decrease of the injection rate at the EOI (end-of-injection) timing yielded positive effect on mixture formation. It also exhibited faster lean mixture formation than that of single injection.
Authors
Topic
Citation
Kim, J., Kakami, S., Nishida, K., and Ogata, Y., "Effects of positive or negative dwell times of split injection on diesel spray development and mixture formation processes," SAE Technical Paper 2019-32-0596, 2020.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 |
Also In
References
- Stephen Busch , Kan Zha , Paul C Miles Investigations of closely coupled pilot and main injections as a means to reduce combustion noise in a small bore direct injection Diesel engine IJER 16 1 13 22 2015
- Konrad Reif Diesel engine management: systems and components, Springer Vieweg 2014
- Khanh Cung , Abdul Moiz , Jaclyn Johnson , Seong-Young Lee , Chol-Bum Kweon , Alessandro Montanaro Spray-combustion interaction mechanism of multiple-injection under diesel engine conditions Proceedings of the combustion institute 35 2015 3061 3068
- Scott Skeen , Julien Manin , Lyle M Pickett Visualization of ignition processes in high-pressure sprays with multiple injections of n-Dodecane SAE Int. J. Engines 8 2 696 715
- Kang Yang , Keiya Nishida , Youichi Ogata , Hirotaka Yamakawa Characteristics of fuel evaporation, mixture formation and combustion of 2D cavity impinging spray under high-pressure split injection Fuel 234 2018 746 756
- R. Maier , J. Warga , Dr. T. Pauer , J. Gerhardt , M. Krüger The Next Generation BOSCH Common Rail Injectors with Digital Rate Shaping - A Key Factor for Meeting Future Requirements, Internationales Wiener Motorensymposium 2012
- Scott A. Skeen , Julien Manin , Lyle M Pickett Simultaneous formaldehyde PLIF and high-speed schlieren imaging for ignition visualization in high-pressure spray flames Proceedings of the combustion institute 35 2015 3167 3174
- Ziman Wang , Hongming Xu , Changzhao Jiang , Miroslaw L. Wyszynski Experimental study on microscopic and macroscopic characteristics of diesel spray with split injection Fuel 174 2016 140 152
- John E. Dec Advanced compression-ignition engines—understanding the in-cylinder processes Proceedings of the Combustion Institute 32 2009 2727 2742
- Kim , J. , Kong , L. , Nishida , K. , Ogata , Y. et al. Comparison of Fuel Concentration Distribution Of Diesel Spray Between Single-And Multi-hole Injectors Under Evaporating, Non-reacting Condition ICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems Chicago, IL, USA July 22-26, 2018
- Kim , J. , Kakami , S. , Nishida , K. , Ogata , Y. Effects of ratio and dwell of split injection on fuel spray and mixture formation process under evaporating, non-reacting condition, submitted to SAE PFL 2019
- John B Heywood Internal combustion engines fundamental McGrawHill 1988
- Zhang , Y. , Ito , T. and Nishida , K. Characterization of Mixture Formation in Split-Injection Diesel Sprays via Laser Absorption-Scattering (LAS) Technique SAE Technical Paper 2001-01-3498 2001
- Yuyin Zhang , Keiya Nishida , Takuo Yoshizaki Quantitative measurement of droplets and vapor concentration distributions in diesel sprays by processing UV and visible images SAE 2001-01-1294
- Kim , J. Kakami , S. , Jin , Y. , Nishida , K. , Ogata , Y. Internal fuel flow, near-field and far-field spray evolution, and mixture formation characteristics of diesel injectors - a comparison between multi-and single-hole injectors SAE Technical Paper 2019-01-0273 2019
- Matsuo , T. , Li , K. , Itamochi , M. , Nishida , K. et al. Tracer LAS technique for quantitative mixture concentration measurement of evaporating diesel spray ILASS Asia 2014, 17th Annual conference on liquid atomization and spray systems - Asia Shanghai China
- Musculus , M. and Kattke , K. Entrainment Waves in Diesel Jets SAE Int. J. Engines 2 1 1170 1193 2009
- Kook , S. , Pickett , L. , and Musculus , M. Influence of Diesel Injection Parameters on End-of-Injection Liquid Length Recession SAE Int. J. Engines 2 1 1194 1210 2009
- Bin Abdullah , M.F.E. , Toyama , Y. , Takahara , K. , Saruwatari , S. et al. Optical Diagnostics of Inversed-Delta Rate Shaping Diesel Spray Flame towards Reduction of Late Combustion SAE Technical Paper 2018-01-1793 2018 10.4271/2018-01-1793