Analysis of Diesel Nozzle Coking Based on In-Cylinder Transient Operating Environment

被引：0
|
作者：
Di L. [1 ]
Yang H. [1 ]
Zhao P. [1 ]
Qi T. [1 ]
Li X. [1 ]
机构：
[1] School of Vehicle and Energy, Yanshan University, Qinhuangdao
来源：
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2017年 / 35卷 / 04期
关键词：
Diesel engine; Fluid-solid coupled heat transfer; Nozzle coking; Numerical simulation;
D O I：
10.16236/j.cnki.nrjxb.201704048
中图分类号：
学科分类号：
摘要：
Based on in-cylinder combustion numerical simulation, the transient thermal environment around the real nozzle of a diesel engine was obtained. The fluid computational region connected the cylinder to the interior of the nozzle and the solid computational region around the nozzle portion protruded into the cylinder were established. Then the spray model and the atomization model were also set for the fuel spray ejected from the outlet of the six-nozzle injector. Aiming at the formation of the nozzle coking, the gas-liquid-solid coupled numerical simulation was carried out through the fluid-solid coupled heat transfer and embedded integrated flow field analysis method. As a result, the temperature distribution and the internal flow field characteristics of the nozzle were obtained. Results show that the nozzle's maximum temperature obtained by heat conduction is only 580 K in a complete working cycle of the diesel engine. However, this value does not exceed the coking temperature threshold. It is found that the main reason of the nozzle coking is that the high-temperature gas in the cylinder flows into the nozzle hole. It is proposed that the coking distribution inside the nozzle is determined by the flow velocity and the direction variation of the high-temperature gas surrounded the nozzle after fuel injection. © 2017, Editorial Office of the Transaction of CSICE. All right reserved.
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页码：338 / 345
页数：7
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