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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。
Objective: During the operation of direct injection internal combustion engine, the fuel is delivered to the combustion chamber for combustion through tiny injection holes (diameter of 100-200μm) on the nozzle. In order to quantitatively study the influence of structural parameters such as nozzle hole diameter and length on the fuel transport process, it is first necessary to achieve high-precision measurement of these structural parameters. Innovative point: the jet nozzle orifice and other important structural features accurately define the outlet to achieve small nozzle orifice diameter and length of the high-precision automatic measurement. Methods: 1.Three-dimensional reconstruction of injector top structure based on synchrotron radiation X-ray CT scanning technology; 2.According to the principle of geometry, macroscopic geometric characteristic parameters were extracted from these discrete three-dimensional digital structure data. The conclusions are as follows: 1. Accurately define the characteristic parameters of the nozzle structure; 2.An automatic measurement method of the diameter and length of the nozzle is established based on the micrometer accuracy to realize the nozzle hole along its axis from the entrance to the exit The automatic measurement of the diameter distribution.