Numerical simulation on internal flow characteristics of intersecting hole nozzles

被引：0

作者：

Leng, Xian-Yin ^{[1
]}

Jin, Yu ^{[1
]}

He, Zhi-Xia ^{[1
]}

Zhong, Wen-Jun ^{[1
]}

Wei, Sheng-Li ^{[1
]}

Long, Wu-Qiang ^{[2
]}

机构：

[1] Institute for Energy Research, Jiangsu University, Zhenjiang

[2] Institute for Internal Combustion Engines, Dalian University of Technology, Dalian

来源：

Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2015年 / 33卷 / 06期

关键词：

Diesel engine; Internal flow; Intersecting hole; Nozzle; Simulation;

D O I：

10.16236/j.cnki.nrjxb.201506074

中图分类号：

学科分类号：

摘要：

The configuration of intersecting hole nozzle, in which each orifice is formed by the converging of two child-holes, was proposed for the improvement of the atomization of diesel engines. To examine the internal flow characteristics of intersecting hole nozzle, the two-fluid model was applied in a 3D CFD package to simulate the internal multi-phase flow in a cylindrical hole nozzle and two types of intersecting hole nozzles. Numerical results show that the configurations of internal flow fields in intersecting hole nozzle are highly different with that in cylindrical hole nozzle. Firstly, for the cylindrical hole nozzle, the abrupt decrease in pressure and abrupt increase in velocity take place within a very short distance downstream the inlet of the hole. However, for the intersecting hole nozzles, the pressure gradually decreases and the velocity gradually increases from the inlet to the outlet of the hole. Secondly, for the cylindrical hole nozzle, cavitation emerges under condition of low cavitation number, and grows from the inlet to the outlet of the hole, while for the intersecting hole nozzles, cavitation hardly emerges or emerges with small amount, the latter case only appears in the intersecting hole nozzle with disturbing domain. Finally, the discharge coefficients of intersecting hole nozzle are 23%-32%, higher than that of cylindrical hole nozzle. Additionally, the internal impulsive disturbances, induced by the unique hole configuration of intersecting hole nozzles, leading to larger high turbulent kinetic energy domain at the cross section of the hole outlet, intensifing the atomization of the fuel jets. © 2015, Chinese Society for Internal Combustion Engines. All right reserved.

引用

页码：522 / 529

页数：7

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