强约束喷嘴内部流场的数值模拟与实验研究  

Internal flow field numerical simulations and experiments of the strongly constrained nozzle

作　　者：单晓杭[1] 钟和冬 袁巧玲[1] 宋卫[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310014

出　　处：《制造技术与机床》2015年第7期112-117,共6页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金资助项目(51305399)

摘　　要：针对磨料射流抛光硬脆材料工件曲面中的射流束发散与冲击损伤的问题,提出了强约束磨粒射流抛光新方法。为验证该方法的可行性和有效性,设计了一种新的抛光工具头。基于欧拉-欧拉多相流模型和标准k-ε湍流模型,利用FLUENT软件对喷嘴内部磨粒流进行了数值仿真,计算得到抛光工具头内部的磨粒流速度和压力分布。在仿真的基础之上,根据硬脆材料工件曲面的加工特点搭建抛光加工实验平台,确定加工参数并进行实验。仿真和加工实验结果表明:抛光工具头的结构设计能有效提高磨粒流的出口速度,并且减小磨粒流的压力损失;出口处的速度以平行于工件表面的剪切速度为主;明显降低了工件表面的法向冲击损伤,提高了工件表面质量。In view of the jet divergence and impingement problems for hard and brittle materials in the processing of parts with complex surfaces polishing, a new method of strongly constrained abrasive jet polishing is pro- posed. In order to verify the feasibility and effectiveness of the method, a new polishing tool is designed, based on Euler - Euler multiphase flow model and the standard k - ~ turbulence model, the internal noz- zle abrasive flow is simulated by using FLUENT software, and the distribution of abrasive flow velocity and pressure inside the polishing tool is caculated. Based on the simulation, according to the features of processing surface parts, an experiment platform is set up and the processing parameters is determined, then conducts the experiment. Simulation and experimental results show that the design of structure of the polishing tool can effectively improve the abrasive flow outlet velocity, and reduce the pressure loss of abrasive flow;outlet velocity gives priority to with shear velocity wihch parallel to the workpiece surface; the impact damage of surface of the workpiece after machining is significantly reduced, the workpiece surface quality can be greatly improved.

关 键 词：硬脆材料 强约束 磨粒射流 数值模拟 

分 类 号：TG664[金属学及工艺—金属切削加工及机床]