前混合水射流中丸粒速度的数值模拟与PIV试验研究  

Numerical Simulation and PIV Experimental Study of Shot Velocity in Pre-Mixed Waterjet

作　　者：朱泽华 刘兰荣[2] 马泳涛[2] 卢春生 张彬[2] ZHU Zehua;LIU Lanrong;MA Yongtao;LU Chunsheng;ZHANG Bin(Henan Provincial Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,Zhengzhou 450001,China;School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Civil and Mechanical Engineering,Curtin University,Perth WA 6845,Australia)

机构地区：[1]郑州大学河南省资源与材料工业技术研究院,郑州450001 [2]郑州大学机械与动力工程学院,郑州450001 [3]School of Civil and Mechanical Engineering,Curtin University,Perth WA 6845,Australia

出　　处：《航空制造技术》2023年第13期80-86,共7页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(U1804254);河南省高等学校重点科研项目(21A460024)。

摘　　要：前混合水射流中丸粒速度是决定混合射流性能的关键因素。采用CFD-DEM双向耦合方法构建了混合射流的三相仿真模型,气液相采用VOF模型并考虑离散相体积分数的影响,丸粒固态相采用拉格朗日坐标下的离散元方法进行建模,通过专用的耦合接口实现双向耦合,得到丸粒在出口确定位置范围内速度仿真值。通过专用的PIV试验台测出相应位置丸粒的速度值。通过对比,仿真结果与测试结果的差值在6%以内,证明了仿真模型的正确性。研究结果表明,喷嘴入口压力和喷嘴出口直径越大,丸粒速度越大;混合比(丸粒体积分数)、喷嘴长度和喷嘴锥角越大,丸粒速度越小,对后续制定改性工艺方案提供了理论基础。The shot velocity is the key factor to determine the performance of pre-mixed waterjet.The three-phase simulation model of a mixed jet was constructed by the CFD-DEM bidirectional coupling method.The VOF model was used for a gas-liquid phase and the volume fraction influence of a discrete phase was considered.The shot solid phase was modeled by the discrete element method under Lagrangian coordinates.The two-way coupling was realized through a special coupling interface,and the simulation value of shot velocity in a fixed position range of the exit was obtained.By using the particle image velocity(PIV)test system,the shot velocity at the corresponding position was measured.By comparison,the difference between simulation and testing results was less than 6%,implying correctness of the simulation model.The simulation results show that the larger the nozzle inlet pressure and nozzle outlet diameter,the greater the shot velocity;The larger the mixing ratio(volume fraction of shots),nozzle aspect ratio and nozzle cone angle,the smaller the shot velocity.This provides a theoretical basis for the subsequent formulation of a modification process.

关 键 词：前混合水射流 改性 CFD-DEM PIV 丸粒速度 

分 类 号：TG178[金属学及工艺—金属表面处理]