均匀液滴喷射过程仿真与试验研究  

Simulation and Experiment Research of the Uniform Drolet Spray Process

作　　者：齐乐华[1] 罗俊[1] 李莉[1,2] 蒋小珊[1] 杨方[1] 

机构地区：[1]西北工业大学机电学院,西安710072 [2]陕西汽车有限公司,西安710072

出　　处：《机械工程学报》2008年第12期86-92,共7页Journal of Mechanical Engineering

基　　金：博士点基金(20070699076);西北工业大学创新基金资助项目

摘　　要：针对液滴喷射增材制造试验参数调整困难、实施难度较大的现存问题,基于流体体积(Volume of fluid,VOF)两相流模型,建立均匀液滴喷射过程流场的计算模型。采用数值模拟的方法,对液滴喷射过程中的液滴流形态、压力场和速度场及其影响因素进行了研究,揭示了形成均匀液滴流的内在变化规律,得到了均匀液滴喷射过程的最优频率。在模拟结果的基础上,建立了液滴喷射装置并配置了相应的高速拍照系统,对射流断裂形态、喷射过程、喷射速度进行了试验研究。结果表明,射流速度主要取决于喷射压强,液滴流均匀性主要取决于扰动频率和扰动振幅,射流的压力场则呈周期性变化。模拟结果与试验结果吻合较好,说明所提出的建模方法是可行的,为不同情况下射流内部流场的计算提供了实用的方法,也为液滴喷射增材制造技术的应用奠定了理论基础。It is difficult to adjust the process parameters of material increase manufacturing based on droplet spray and generally these experiments are hard to implement. For solving this problem, a flow modal of uniform droplet spray based on volume of fluid（VOF） two phase flow model is developed. The pattern of droplet stream, the pressure field and the velocity field in the droplet spay process are studied by using the numerical simulation method. The inner low of uniform droplets formation is revealed and the optimal frequency of uniform droplet is obtained. On the basis of the simulation results, a uniform droplet spray device is built and equipped with a corresponding high speed camera, The jet pattern, droplet spray process and jet velocity are studied experimentally. The results show that the jet velocity depends on the jet pressure, which presents a periodical change, and uniformity of droplet stream depends on disturbance frequency and amplitude. The simulation results agree well with the experimental results, which proves the feasibility of the flow modal. The researches find a useful method for simulating the jet flow with different parameters, and lay the theoretical foundation for the application of material increase manufacturing based on droplet spray.

关 键 词：液滴喷射 流体体积法 液滴形态 仿真 

分 类 号：TH16[机械工程—机械制造及自动化] O242.1[理学—计算数学]