喷油嘴微孔磨粒流抛光数值模拟与试验

摘要/Abstract

摘要： 以喷油嘴喷孔为研究对象，采用kε固液两相Mixture湍流模型对磨粒流抛光过程中流场分布规律进行数值模拟，并通过正交试验探索了抛光压力、磨料浓度、磨粒粒径及加工时间等工艺参数对被抛光微孔表面粗糙度的影响规律。结果表明：喷油嘴微孔磨粒流单向循环抛光加工有利于改善喷孔结构；流道表面粗糙度与各加工参数均成负相关关系，且受抛光压力及磨料浓度影响显著。通过试验获得了最优参数组合，在此条件下喷油嘴微孔表面粗糙度值(Ra)由初始的1.16μm降至0.20μm。

关键词: 喷油嘴微孔, 磨粒流抛光, 湍流模型, 表面粗糙度

Abstract: Abrasive flow polishing of nozzle microholes was studied herein, and the processes were simulated by using the Mixtures turbulence model of kε solid1iquid twophase to study the flow field distribution. Through the orthogonal experiment, the effects of polishing pressures, concentration, grain sizes and processing times on the surface roughness were researched systematically. Results show that this mode of unidirectional cycle processing is applicable to improve microhole structure. The surface roughness of the flow channel has a negative correlation with each machining parameters, and is greatly affected by the polishing pressures and abrasive concentration. The optimum combination of parameters was obtained, and under this condition the surface roughness values of nozzle microholes drop to 0.20μm from 1.16μm.

Key words: nozzle microhole, abrasive flow polishing, turbulence model, surface roughness

中图分类号:

刘薇娜, 蔡智杰, 李云峰, 任成祖. 喷油嘴微孔磨粒流抛光数值模拟与试验[J]. 中国机械工程.

LIU Weina, CAI Zhijie, LI Yunfeng, REN Chengzu. Numerical Simulation and Experiments of Abrasive Flow Polishing for Nozzle Microholes[J]. China Mechanical Engineering.

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