喷油嘴喷孔直径和长度自动测量方法的开发和应用（英文）  

Development and application of an automatic measurement method for nozzle orifice diameter and length

作　　者：Zhi-long LI Zhi-jun WU Ya GAO Wei-di HUANG Hui-feng GONG Lin ZHANG Li-guang LI 

机构地区：[1]School of Mechanical Engineering, Tongji University [2]School of Automotive Studies, Tongji University

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2015年第1期11-17,共7页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.91441125,51106113,and 51376139);the New Century Excellent Talents(No.NCET-10-0605);the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20120072110015);the China Postdoctoral Science Foundation(No.2013M531209);the Fundamental Research Funds for the Central Universities,China

摘　　要：目的:直喷内燃机工作过程中,燃油通过喷油嘴上的微小喷孔(直径为100–200μm)输送到燃烧室内进行燃烧做功。为定量研究喷孔直径和长度等结构参数对燃油输运过程的影响,首先需要实现对这些结构参数的高精度测量。创新点:对喷油嘴喷孔入口和出口等重要结构特征进行精确地定义,实现喷油嘴微小喷孔的直径和长度的高精度自动测量。方法:1.基于同步辐射X射线CT扫描技术实现喷油嘴顶部结构的三维重构;2.结合几何学原理,从这些离散的三维数字结构数据中提取宏观几何特征参数。结论:1.对喷油嘴喷孔结构特征参数进行了精确地定义;2.基于微米级精度建立了喷油嘴喷孔直径和长度的自动测量方法,实现喷孔沿其轴线从入口到出口的直径分布的自动测量。Diesel sprays are important to engine combustion and emission formation processes, however, their behaviors are difficult to predict as they are very sensitive to the internal geometries of the nozzle. Based on synchrotron radiation X-ray to-mography, a novel method is presented for measuring automatically the orifice diameter and length of fuel nozzles. According to this method, a clear definition of orifice inlet and outlet is given, and the diameters along the orifice from inlet to outlet as well as the orifice length can be measured. Measurements of a single-hole nozzle and an eight-hole nozzle have been performed ac-cordingly. The results show that this method can automatically measure the orifice diameters from outlet to inlet along the whole orifice axis with relatively high precision, regardless of whether it is a single-hole or a multi-hole nozzle. The profile of the di-ameters obtained shows the differences between the nominal dimensions and the actual ones, which gives a more precise feedback for nozzle manufacture, and provides a new basis for precisely studying the impacts of internal geometries on spray behavior.

关 键 词：柴油喷嘴 喷孔直径 喷孔长度 X射线 CT扫描 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]