Effects of split ratio of diesel spray injection on mixture formation and combustion process

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Effects of split ratio of diesel spray injection on mixture formation and combustion process

Ray, Samir Chandra / Kim, Jaeheun / Kakami, Scinichi / Nishida, Keiya / Ogata, Yoichi

The effects of the split ratio on the mixture formation and combustion process of a diesel spray in a constant-volume chamber were experimentally investigated. A commercial seven-hole injector was used in this experiment. The effects of the mass-dependent split ratio and dwell time were observed when the total fuel injection was 5.0 mg/hole. Three split ratios were considered: 3:7, 5:5 and 7:3, while the dwell time of 120 µs was fixed for every condition. A laser absorption-scattering technique was adopted to examine the formation of mixtures with regarding to the equivalence ratio. A high-speed video camera was used to observe natural flame luminosity, and a two-colour pyrometer system was employed to evaluate the temperature and soot concentrations in the flame. Among the distribution ratios tested in this study, the 7:3 split ratio exhibited the best performance for the lean mixture formation considering the overall equivalence ratio distribution. The air entrainment wave at the end of injection timing of the first injection caused the fuel near the nozzle to lean at a rapid rate. The soot formation process for the 3:7 and 5:5 split ratios was observed because the second injection fuel caught the flame of the previous injections; this deteriorated the combustion region and influenced soot formation. The result also revealed that for the 7:3 split ratio, accelerated the soot deduction rate to the cycle of soot oxidation during the combustion period.

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Title :

Effects of split ratio of diesel spray injection on mixture formation and combustion process

Contributors:

Ray, Samir Chandra (author) / Kim, Jaeheun (author) / Kakami, Scinichi (author) / Nishida, Keiya (author) / Ogata, Yoichi (author)

Published in:

Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ; 235 , 14 ; 3404-3415

Publication date :

2021-12-01

Size :

12 pages

ISSN :

0954-4070 , 2041-2991

DOI :

https://doi.org/10.1177/09544070211014326

Type of media :

Article (Journal)

Type of material :

Electronic Resource

Language :

English

Keywords :

mixture formation , combustion , Diesel engine , soot formation and oxidation , fuel spray

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