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    • Analysis of Spray Wall Impingement Combustion Processes under Different Wet-Wall Conditions
    DOI：10.13949/j.cnki.nrjgc.2019.01.003
    Key Words:constant volume combustion chamber  wet-wall condition  spray wall impingement combustion  soot
    Author NameAffiliation
    LAN Tiankai, HUANG Ronghua, HUANG Sheng, YANG Zhenhuan, LI Zhipeng, WANG Longfei 1.China EU Institute for Clean and Renewable Energy， Huazhong University of Science & Technology, Wuhan 430074, China
    2.China North Engine Research Institute, Tianjin 300400, China 
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    Abstract:By using the wet conditions generated by changing the air change density （7.5 kg/m3 to 15.0 kg/m3）and injection hole diameter(0.11 mm to 0.22 mm) in a constant volume combustion chamber test device, a high-speed camera was used to study the effect of different wet wall conditions on the spray wall impingement combustion process. The ignition delay of spray combustion increases with the decrease of the air charge density and increases with the rise of wall humidity, but it is more significantly affected by the air charge density. For the given high fuel injection pressure and air intake density, spray atomization with different injection hole diameters is very good. The spray ignition is mainly influenced by the time of chemical preparation, and the fluctuation of ignition delay is not large. With the increase of humidity on the wall, the time for the spray burning to outer the high temperature ignition phase will be much later. Resulting in a serious post combustion and increased combustion duration, which leads to a sharp increase in soot emissions.
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