Effect of Pressure Chamber Structure on Cavitation and Gas Ingestion in Diesel Nozzle After End of Injection

被引：0
|
作者：
Wen H. [1 ]
Ni X. [1 ]
Jiang G. [1 ]
机构：
[1] School of Mechanical and Electrical Engineering, Nanchang University, Nanchang
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2020年 / 38卷 / 02期
关键词：
Cavitation; Diesel nozzle; End of injection (EOI); Gas ingestion; Pressure chamber;
D O I：
10.16236/j.cnki.nrjxb.202002021
中图分类号：
学科分类号：
摘要：
The cavitation phenomenon after the end of injection(EOI) has important influence on flow field in the injection interval. The high temperature ingestion caused by cavitation will cause coking in the hole, which will affect the atomization of the jet in the cylinder. Based on the visual test and volume of fluid(VOF) two-phase three-component multiphase flow solver, the flow process of the diesel nozzle after the EOI was tested and simulated. The wall curvature structure of three different pressure chambers was analyzed to analyze the cavitation and gas ingestion after the EOI. The results show that cavitation occurs in the nozzle hole and the pressure chamber after the EOI. The cavitation in the pressure chamber is large, and it appears as vortex cavitation and strip cavitation. The strip cavitation is dominant when the narrow structure is small wall curvature. The cavitation volume of the nozzle with a narrower pressure chamber structure becomes larger, but the extension of the low pressure makes the diesel outflow smaller, eventually causing the ingestion to decrease. In the case of vortex cavitation, Q and the vortex cavitation volume are positively correlated. The smaller the vortex core region is, the less frictional dissipation is in the flow field and the easier the formation of pressure chamber cavitation is. © 2020, Editorial Office of the Transaction of CSICE. All right reserved.
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页码：154 / 160
页数：6
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