杨海涛,张清林,陈大陆.柴油机喷嘴喷孔表面微观形貌测量及应用[J].表面技术,2017,46(12):283-289.
YANG Hai-tao,ZHANG Qing-lin,CHEN Da-lu.Surface Microstructure Measurement and Application of Diesel Engine Nozzle Holes[J].Surface Technology,2017,46(12):283-289 |
| 柴油机喷嘴喷孔表面微观形貌测量及应用 |
| Surface Microstructure Measurement and Application of Diesel Engine Nozzle Holes |
| 投稿时间：2017-08-11 修订日期：2017-12-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2017.12.044 |
| 中文关键词: 柴油机喷孔 微观形貌 评价方法 三维重构 软件开发 扫描电镜 |
| 英文关键词:diesel engine holes microstructure evaluation method 3D reconstruction software development SEM |
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| 中文摘要: |
| 目的 建立一套用于柴油机喷嘴喷孔表面形貌分析的标准化评价分析流程。方法 通过线切割和研磨获取喷油嘴喷孔截面，使用白光干涉仪和扫描电镜对三支产品级喷嘴喷孔表面微观形貌进行检测，基于分形理论对喷孔表面微观形貌特征进行分析评价。最后，基于Monte Carlo方法，利用幅值均方根和相关长度两个关键参数，实现了对喷孔表面微观形貌的三维重构。结果 在沿着喷孔轴线方向、评价长度为0.6 mm的条件下，样品A、B和C的喷孔表面粗糙度Ra分别为0.33、0.25、0.11 m，基于功率谱法得到的喷孔表面分形维度分别为1.54、1.61和1.82。结论 采用不同加工工艺的三支喷油嘴样品中，样品C喷孔表面的加工质量最好，与扫描电镜检测结果一致。因此，采用Ra值结合分形法能够合理地评价柴油机喷孔表面的加工质量。同时，基于特征参数的喷油嘴三维重构模型，为喷孔表面微观形貌可视化和CFD计算模型提供了有效解决方案。 |
| 英文摘要: |
| The work aims to establish a standardized evaluation analysis process for analyzing surface microstructure of diesel engine nozzle holes. Section of the nozzle holes was obtained by wire-electrode cutting and grinding. Surface microstructure of three product-level nozzle holes was tested with white light interferometry and scanning electron microscope. The microstructure characteristics of the nozzle holes were analyzed and evaluated based upon fractal theory. Finally, 3D reconstruction of the microstructure was realized in the method of Monte Carlo based upon the key parameters-amplitude root-mean-square and correlation length. Along the axis of orifice with evaluation length of 0.6 mm, hole surface roughness of sample A, B and C was 0.33, 0.25 and 0.11 m, respectively. The fractal dimension of hole surface was 1.54, 1.61 and 1.82, respectively based on power spectrum. Surface processing quality of sample C is the best among three injection nozzles being processed in different tech-nologies, which is consistent with the testing results of SEM. The surface processing quality of diesel nozzle hole can be evaluated reasonably by combining Ra value and fractal method. Meanwhile, the 3D reconstruction model of injection nozzle based upon characteristic parameters provides effective solutions for surface microstructure visualization and CFD calculation model. |
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