吴远超,李秀红,王嘉明,李文辉,杨胜强,师世豪.水平振动抛磨颗粒介质流场特性分析[J].表面技术,2021,50(11):329-338.
WU Yuan-chao,LI Xiu-hong,WANG Jia-ming,LI Wen-hui,YANG Sheng-qiang,SHI Shi-hao.Flow Field Characteristics Analysis of Media for Horizontal Vibratory Mass Finishing[J].Surface Technology,2021,50(11):329-338 |
| 水平振动抛磨颗粒介质流场特性分析 |
| Flow Field Characteristics Analysis of Media for Horizontal Vibratory Mass Finishing |
| 投稿时间：2021-02-03 修订日期：2021-03-24 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.11.035 |
| 中文关键词: 振动抛磨 滚磨光整加工 离散元法 颗粒流场 对流强度 流场特征 |
| 英文关键词:mass finishing vibration mass finishing DEM media flow field convection intensity flow field characteristics |
| 基金项目:国家自然科学基金(51975399，51875389，52075362) |
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| Author | Institution |
| WU Yuan-chao | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Precision Machining, Taiyuan 030024, China |
| LI Xiu-hong | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Precision Machining, Taiyuan 030024, China |
| WANG Jia-ming | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Precision Machining, Taiyuan 030024, China |
| LI Wen-hui | Shanxi Key Laboratory of Precision Machining, Taiyuan 030024, China;College of Aeronautics and Astronautics, Taiyuan University of Technology, Taiyuan 030600, China |
| YANG Sheng-qiang | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Precision Machining, Taiyuan 030024, China |
| SHI Shi-hao | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Precision Machining, Taiyuan 030024, China |
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| 中文摘要: |
| 目的 探索不同振动参数下水平振动抛磨颗粒介质的流动模式和流场特性。方法 基于离散元法(DEM)，对水平振动抛磨工艺下的颗粒介质运动特性进行模拟，分析颗粒介质的流场特征和不同参数下颗粒介质的流态变化，研究颗粒介质床层高度比、空区变化和对流面积比对整个颗粒系统对流强度的影响，以及颗粒介质的平均速度对流场的影响，并通过高速摄影速度测试实验验证模拟的有效性。结果 在外部振动作用下，颗粒介质流场可分为对流区、混流区和稳流区3个区域。随着频率的增加，颗粒介质的平均速度在18 Hz达到最大，然后减小。随着振幅的增加，颗粒介质的平均速度增大。颗粒介质的床层高度比、空区和对流面积比的变化与平均速度随振动参数的变化趋势一致。结论 随着振幅增大或是频率达到18 Hz左右时，平均速度变大，颗粒介质床层逐渐由上层到下层从只有稳流类固态转变为有对流与混流的类液态。颗粒介质的平均速度与对流强度的变化趋势一致，因此可通过前者预测后者的变化，而且增加振幅比增加频率能够更有效地提升对流的流化程度。 |
| 英文摘要: |
| The paper aims to explore the media flow mode and media flow field characteristics of the horizontal vibratory mass finishing under different vibration parameters. The model was established based on the discrete element method (DEM) to simulate the movement characteristics of the media under the horizontal vibratory mass finishing. The media flow field characteristics and the flow regime change of the media under different parameters were analyzed, the influence of media bed height ratio, change of the empty area and convection area ratio on the convection intensity of the entire particle system and the influence of the average velocity of the media on the flow field was studied, and then simulation results had verified by high-speed photography speed test experiments. Under the external vibration, the media flow field was divided into three areas:convection area, mixed flow area and steady flow area. As the frequency increased, the average velocity of the media reached the maximum at 18 Hz and then decreased. As the amplitude increased, the average velocity of the media increased. The changes in media bed height ratio, the empty area and convection area ratio were consistent with the change trend of the average velocity with the vibration parameters. As the amplitude increases or the frequency reaches about 18 Hz, the average velocity becomes larger, and the media bed gradually changes from the upper layer to the lower layer and from the only solid state,of steady-flow to the liquid state with convection and mixed flow. The average velocity of the media is consistent with the change trend of the convection intensity, so the change of the latter can be predicted by the former. Moreover, increasing the amplitude is more effective than increasing the frequency to improve the fluidization degree of convection. |
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