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    • Experimental Study on Influence of Pilot Injection on Main Injected Diesel Fuel Combustion Under a Split Injection
    DOI：10.13949/j.cnki.nrjgc.2019.03.005
    Key Words:split injection  ignition delay  combustion duration  lift-off length   liquid length
    Author NameAffiliation
    WANG Shengquan, WANG Qian, ZHONG Wenjun, ZHU Jiangtao, HE Zhixia 1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
     2.Institute of Energy Research, Jiangsu University, Zhenjiang 212013, China 
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    Abstract:The influence of the pilot injection on the main injected diesel fuel combustion under a split injection at low temperature was studied using a visualized constant volume combustion chamber and a high speed digital camera. The experimental study on single injection combustion process showed that both of its ignition delay and combustion duration decreased, while the flame lift-off length and liquid length increased with the increase of the injection pressure. A comparison was made of the combustion processes of single injection and the main injection of a split injection with the same injection pressure and pulse width. The results show that the initial ignition position of the main injection is closer to the nozzle than that of the single injection, and the ignition delay of the main injection is greatly shortened because of the pilot injection, but the influence of the pilot injection ratio on the ignition delay of the main injection is small. Meanwhile, the combustion duration of the main injection is longer and increases with the increase of the pilot injection ratio. The flame lift-off length of the main injection is smaller than that of the single injection, and slightly increases with the increase of the pilot spray ratio. Furthermore, the liquid length of the main injection is shorter than that of the single injection during combustion, and decreases with the increase of the pilot injection ratio.
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