关键词: 仿真, 流体体积法, 液滴喷射, 液滴形态

Abstract: 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.

Key words: Droplet pattern, Droplet spray, Simulation, Volume of fluid method