Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
Indexed in
CHARACTERISTICS OF FREE SPRAY DEVELOPMENT, MIXTURE FORMATION, AND COMBUSTION UNDER HIGH-PRESSURE SPLIT INJECTION
ABSTRACT
The objective of this study is to gain an enhanced understanding of the characteristics of free spray development, mixture formation, and combustion under high-pressure split injection. The fuel was injected into a constant volume vessel by a single-hole nozzle with a hole diameter of 0.111 mm. The injection process comprised a pre-injection followed by the main injection. The main injection was carried out either as (i) a single main injection, with injection pressure of either 100 MPa or 160 MPa, or (ii) a split main injection with injection pressure of 160 MPa defined by the mass fraction ratio of 75:25. A high-speed camera was used to observe the spray development under non-evaporation conditions. The tracer LAS technique was used to observe the spray mixture formation process. The diesel spray combustion and soot formation processes were studied using a high-speed video camera and examined by two-color pyrometry. The experimental results revealed that split injection can make the vapor phase more homogeneous. Split injection could enhance the combustion and decrease the soot emissions. The soot evolution process was divided into three parts under the single main injection, but into six parts during the split main injection. The effect of the split injection on the soot evolution process ended at the same time when the injection duration is same.
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Taghavifar Hadi, Nemati Arash, Salvador F.J., De la Morena J., Improved mixture quality by advanced dual-nozzle, included-angle split injection in HSDI engine: Exergetic exploration, Energy, 167, 2019. Crossref
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Hadadpour Ahmad, Xu Shijie, Pang Kar Mun, Bai Xue-Song, Jangi Mehdi, Effects of pre-injection on ignition, combustion and emissions of spray under engine-like conditions, Combustion and Flame, 241, 2022. Crossref
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Chandra Ray Samir, Kim Jaeheun, Kakami Scinichi, Nishida Keiya, Ogata Youichi, Effects of dwell time of split injection on mixture formation and combustion processes of diesel spray, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 236, 9, 2022. Crossref