Effects of Nozzle Shape on Characteristics of Diesel Spray Combustion and Soot Formation

被引：0
|
作者：
Sun Z. [1 ,2 ]
Lu P. [1 ]
Xuan T. [1 ]
He Z. [2 ]
机构：
[1] School of Power and Engineering, Jiangsu University, Zhenjiang
[2] Institute for Energy Research, Jiangsu University, Zhenjiang
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2021年 / 39卷 / 03期
关键词：
Diesel; Flame lift-off length; Nozzle shape; Optical diagnosis; Soot radiation intensity;
D O I：
10.16236/j.cnki.nrjxb.202103026
中图分类号：
学科分类号：
摘要：
In order to study the effects of nozzle cavitation on characteristics of diesel spray combustion and soot formation, two types of nozzle with cylindrical and convergent shapes were measured with high-speed Schlieren imaging and soot natural luminosity techniques simultaneously within a high-pressure high-temperature constant pressure vessel. It is found that the effects of nozzle shape on spray morphology are not remarkable under different operating conditions. The spray tip penetration is a little more slow and the spray cone angle is a little larger for the cylindrical nozzle compared with the convergent one. This is because the cavitation effect within the nozzle brings an increase in turbulence energy at the nozzle orifice. The flame lift-off length of the cylindrical nozzle is slightly shorter than that of the convergent one due to the relatively lower injection velocity. Based on the analysis of soot radiation intensity, it can be found that the nozzle shape has a significant effect on the formation of soot. The soot initial position of the cylindrical nozzle is far downstream away from the nozzle tip. Furthermore, thanks to the cavitation effect, the mixing between fuel and air of the cylindrical nozzle is better than that of the convergent one, which is in favor of reducing the in-flame soot formation. © 2021, Editorial Office of the Transaction of CSICE. All right reserved.
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页码：201 / 208
页数：7
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