• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (9): 120-126.doi: 10.3901/JME.2019.09.120

• 数字化设计与制造 • 上一篇    下一篇

空化水喷丸中空泡云动态演变及靶距优化研究

李富柱, 谭中锐, 陈立宇, 李瑞涛, 许桢英, 王匀   

  1. 江苏大学机械工程学院 镇江 212013
  • 收稿日期:2018-08-31 修回日期:2018-10-15 出版日期:2019-05-05 发布日期:2019-05-05
  • 通讯作者: 王匀(通信作者),男,1975年出生,博士,教授,博士研究生导师。主要研究方向为激光微加工、表面工程、非传统加工工艺。E-mail:wangyun@ujs.edu.cn
  • 作者简介:李富柱,男,1971年出生,博士,副教授,硕士研究生导师。主要研究方向为机电液一体化系统及液压系统空化。E-mail:lifuzhu@ujs.edu.cn
  • 基金资助:
    国家自然科学基金(51575245,51679112)和江苏省重点研发计划(BE2016161)资助项目。

Study on Dynamic Evolution of Cavitation Clouds and Optimization of Standoff Distance in Water Cavitation Peening

LI Fuzhu, TAN Zhongrui, CHEN Liyu, LI Ruitao, XU Zhenying, WANG Yun   

  1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013
  • Received:2018-08-31 Revised:2018-10-15 Online:2019-05-05 Published:2019-05-05

摘要: 空化水喷丸是利用空化水射流中空泡云溃灭的能量冲击金属零件表面,使其表面产生强化效果的一种新工艺,但目前靶距选择缺少依据。利用高速相机开展了空化水射流试验,采用帧间差分法(Frame-difference method,FDM)分析了空泡云动态演变规律,得出空泡集中溃灭范围。同时,以2A12铝合金为例,基于不同直径d的喷嘴,进行空化水喷丸验证试验,研究了不同靶距对材料表面性能的作用规律。结果表明,空泡云具有明显的初生-发展-脱落-溃灭的周期性,空泡集中溃灭范围为60d~75d;空化水喷丸的最佳靶距为60d~67.5d,但当d=1.8 mm、靶距为120 mm时产生过喷现象;提出了根据靶距空化水射流可分为液滴作用区、混合作用区和空化作用区。

关键词: FDM, 靶距, 动态变化, 空化水喷丸, 空泡云, 喷嘴直径

Abstract: Water cavitation peening is a new surface strengthening method with the energy released from cavitation clouds collapse, which are generated in cavitation water jet to impact the surface of metal parts. However, there is currently no basis for the standoff distance selection. The cavitation water jet experiment is performed with the high-speed camera for photographing to analyze the dynamic evolution law of cavitation cloud by FDM (frame-difference method). The concentrated collapse range of cavitation is obtained. The water cavitation peening test for 2A12 aluminum alloy is carried out to study the effect of different standoff distances on the surface properties of the materials with different nozzles diameters d. The results show that the cavitation cloud has obvious periodicity including incubation, developing, shedding and collapse phases in one cycle. The concentrated collapse range of cavitation bubbles is 60d-75d. The optimal standoff distance for water cavitation peening should be 60d-67.5d, but over peening occurs at a standoff distance of 120 mm while d=1.8 mm. The cavitation water jet can be divided into the droplet action, the mixed action, and the cavitation action zones according to the standoff distance.

Key words: cavitation cloud, dynamic change, FDM, nozzle diameter, standoff distance, water cavitation peening

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