Visualization of Cavitating Flow in Diesel Injector Nozzles and Its Effects on Spray

被引：0
作者：
Shi D. [1 ]
Zhou Z. [1 ]
Guo L. [1 ]
Yang H. [1 ]
Xia X. [1 ]
机构：
[1] FAW Wuxi Fuel Injection Equipment Research Institute, Wuxi
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2019年 / 37卷 / 01期
关键词：
Cavitating flow; Diesel engine; Injector nozzle; Spray; String cavitation; Visualization;
D O I：
10.16236/j.cnki.nrjxb.201901008
中图分类号：
学科分类号：
摘要：
Cavitating flow in diesel injector nozzles affects the atomization behavior, which then strongly affects performances and emissions of diesel engine. Experiments were carried out to study the cavitating flow under different injection pressures, needle lifts and nozzle structures based on a visualization system with transparent scaled-up injector nozzles. A high speed CCD camera equipped with a long distance microscope device was used to capture the cavitation and spray images. The results show that two kinds of cavitation phenomenon are observed: one is film-type cavitation induced by nozzle geometrical structure, and the other is string cavitation generated in the low pressure region at the center of vortex flow. Moreover, the increase of injection pressure or needle lift will contribute to the development of film-type cavitation, while tapered nozzle will suppress it. It is also found that the string cavitation is closely related to the vortex flow in the nozzle, and the strength of string cavitation increases with the increase of injection pressure. In addition, both the film-type cavitation and string cavitation will increase the spray cone angle. © 2019, Editorial Office of the Transaction of CSICE. All right reserved.
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页码：54 / 59
页数：5
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