喷孔几何特征对变截面喷油孔空穴流动状态的影响
Effect of Geometry Characteristics on Internal Cavitation Flow of Injection Nozzle with Varying Hole Cross-Section
查看参考文献11篇
文摘
|
采用混合多相流模型及空穴模型相结合的方法,对喷油嘴激光打孔过程形成的变截面喷油孔内空穴流动现象进行数值模拟,重点分析喷孔几何特征对空穴流动状态的影响规律.结果表明,变截面喷孔内喷孔截面收缩或者扩张的程度及位置对孔内燃油空穴流动状态具有重要影响.截面收缩型的喷孔可在出口形成更大的空穴强度分布,利于促进燃油的初次分裂及雾化.截面扩张型喷孔可使得出口燃油速度分布更均匀,出口平均速度增大,从而提高流量系数;研究还发现,相对于直喷孔,变截面喷油孔内空穴流动状态对孔入口倒角变化的敏感性减小,这将有利于提高多孔喷嘴各孔流量及雾化的均匀性. |
其他语种文摘
|
Injection Nozzles with Varying Hole Cross-section(NVHC)accomplished by laser drilling may influence the internal flow.The phenomena of cavitation flow in two types of NVHC(elliptic-shaped and hyperbolic-shaped)were simulated using mixed multiphase flow model coupled with cavitation model.The main objective is to analyze the effect of nozzle shape with different types on the distribution of cavitation and the outlet velocity.Simulation results show that the outlet velocity of elliptic-shaped nozzles is higher than that of cylindrical-shaped nozzles,and the outlet velocity distribution gives more uniform profile.Stronger outlet cavitation intensity is found in hyperbolic-shaped nozzles,which enhances the fluctuation of outlet flow and eventually improves the fuel break-up and atomization.The study also shows that,the inner flow state in NVHC is less sensitive to the fluctuation of inlet rounded radius than that in cylindricalshaped nozzle,and this improves the uniformity of flow discharge and spray in the process of multi-holes injection. |
来源
|
内燃机学报
,2012,30(3):254-259 【核心库】
|
关键词
|
激光打孔
;
变截面喷孔
;
空穴流动
|
地址
|
1.
中国科学院力学研究所, 北京, 100190
2.
中国北方发动机研究所, 湖北, 廊坊, 065000
|
语种
|
中文 |
文献类型
|
研究性论文 |
ISSN
|
1000-0909 |
学科
|
能源与动力工程 |
基金
|
国防基础科研基金
|
文献收藏号
|
CSCD:4545086
|
参考文献 共
11
共1页
|
1.
Bergwerk W. Flow pattern in diesel nozzle spray holes.
Proc Inst Mech Engrs,1959,173(25):655-674
|
被引
8
次
|
|
|
|
2.
Soteriou C. Direct injection diesel sprays and the effect of cavitation and hydraulic flip on atomization.
SAE Paper 950080,1995
|
被引
3
次
|
|
|
|
3.
Yuan Weixing. Modeling and computation of unsteady cavitation flows in injection nozzles.
Mecanique and Industries,2001,2(5):383-394
|
被引
1
次
|
|
|
|
4.
Schmidt David P.
Cavitation in diesel fuel injector nozzles,1997
|
被引
3
次
|
|
|
|
5.
Dabiri S. Cavitation in an orifice flow.
Physics of Fluids,2007,19(7):1-9
|
被引
5
次
|
|
|
|
6.
何志霞. 喷油嘴喷孔内部空穴两相流动数值模拟分析.
内燃机学报,2004,22(5):433-438
|
被引
23
次
|
|
|
|
7.
魏明锐. 柴油机孔式喷油嘴内空穴流动的模拟分析.
内燃机学报,2006,24(6):526-530
|
被引
9
次
|
|
|
|
8.
Martin Kraus. Micro-drilling in steel using ultra-short pulsed laser beams with radial and azimuthal polarization.
Optics Express,2010,18(21):22305-22313
|
被引
13
次
|
|
|
|
9.
Kull Winklhofer E. Comprehensive hydraulic and flow field documentation in model throttle experiments under cavitation conditions.
ILASS Europe,2001
|
被引
1
次
|
|
|
|
10.
Payri R. Effects of nozzle geometry on direct injection diesel engine combustion process.
Applied Thermal Engineering,2009,29(10):2051-2060
|
被引
9
次
|
|
|
|
11.
Payri F. The influence of cavitation on the internal flow and the spray characteristics in diesel injection nozzles.
Fuel,2004,83(4/5):419-431
|
被引
41
次
|
|
|
|
|