为了分析某型船用柴油机双层喷孔喷雾贯穿距差异，利用AVL FIRE软件分别对喷嘴内部瞬态流动和定容弹内喷雾过程进行仿真计算，得到了喷孔出口处液相压力、速度、流量以及定容弹内喷雾贯穿距。结果表明，上排喷孔出口处的液相压力、流速和出口流量均比下排喷孔的大，而且上下2排喷孔内产生的空穴位置和大小也有差异；定容弹喷雾过程计算结果显示，在相同喷射时刻下，上排喷孔的喷雾贯穿距比下排喷孔的长，说明由于双层交错喷孔位置不同，其内部液相流动特性不相同，使得上下2排喷孔的喷雾发展存在差异。
In order to analyze the spray penetration difference of double arranged multi-hole nozzle for a certain type Marine Diesel Engine. The transient flow inside the nozzle and the spray process in the constant volume bomb was simulated by using the AVL FIRE software. The liquid pressure, velocity, the nozzle outlet and spray penetration in the constant volume bomb were calculated. Results show that the upper row nozzle outlet liquid pressure, velocity, and flow rate were higher than lower row nozzle. And the distribution region and the intension of cavitations in nozzle are different by nozzle position. Under the same injection time, the spray penetration of the upper row nozzle is longer than the lower row nozzle. Because of the different position of the two layers nozzle, the flow characteristics of the liquid phase were different, and the spray development was differences of the two row nozzle.
2018,(): 81-84 收稿日期：2017-02-13
DOI：10.3404/j.issn.1672-7649.2018.02.015
分类号：TK421
作者简介：闫萍(1975-),女,博士,高级工程师,主要从事船用柴油机喷雾、燃烧及排放控制技术研究
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