喷油器带毛刺喷孔的喷雾特性试验  

Experiment on Diesel Spray Characteristics of Nozzle Hole with Micro-Burr

作　　者：高志胜[1] 王谦[1] 何志霞[1] 孙伟[1] 郦赟 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《内燃机学报》2015年第6期530-536,共7页Transactions of Csice

基　　金：国家自然科学基金资助项目(51276084;51176066);江苏省高校优势学科建设工程资助项目(2014-2017);高校博士点专项基金资助项目(20133227110007);江苏省普通高校研究生科研创新计划资助项目(CXZZ11_0560)

摘　　要：基于X射线CT成像技术获取了柴油喷油嘴喷孔几何结构,采用喷雾可视化技术研究了带毛刺喷孔喷雾特性.结果表明:与无毛刺喷孔相比,启喷阶段,带毛刺喷孔出口处近场喷雾湍流脉动有所增强;稳定阶段,带毛刺喷孔改变了喷雾对称结构,首先喷孔内毛刺能够从喷雾射流表面剥离出部分燃油,该部分燃油经过初次破碎后形成较为分散的液丝,其次带毛刺喷孔远场喷雾二次雾化后液滴扩散范围增大;带毛刺喷孔喷雾发展过程中出现分叉现象.Diesel nozzle hole-geometry was obtained based on the X-ray CT imaging technology. The effects of the inner-hole micro-burr on the near-field and far-field spray characteristics were investigated by using the spray visualization techniques. Results showed that the turbulent intensities of the near-field spray jet, injected from the nozzle hole with micro-burr, are stronger than those injected from the nozzle hole without the micro-burr in the beginning of injection. During steady period of injection, the micro-burr will change the symmetrical spray form. Firstly, the micro-burr will strip some fuel from the diesel spray surface and breakup into more diffused fuel ligaments. Secondly, after secondary atomization of these ligaments, the generating far-field spray droplets show larger diffusing range. Under the effect of the micro-burr, the branch structure appears during the spray development process. © 2015, Chinese Society for Internal Combustion Engines. All right reserved.

关 键 词：柴油机 喷孔 毛刺 喷雾特性 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]