两阶段悬浮液超音速火焰喷涂多相流模拟研究  

Multiphase flow simulation of two-stage suspension high-velocity oxygen fuel spraying

作　　者：何戴 焦建梁 单彦广[1] HE Dai;JIAO Jianliang;SHAN Yanguang(School of Energy and Power Engineer,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《上海理工大学学报》2023年第6期591-601,共11页Journal of University of Shanghai For Science and Technology

基　　金：国家自然科学基金资助项目(52176159)。

摘　　要：为研究两阶段悬浮液超音速火焰喷涂过程中的流场分布以及液滴/颗粒行为,采用三维Euler-Lagrange耦合建模方法,模拟悬浮液在流场中破碎雾化、运动换热、蒸发扩散并最终被基板捕捉的过程。悬浮液物性由基于实验的拟合函数编译,并考虑了液滴形状变化的影响。结果表明:通过调节氮气质量流量,可以在不影响焰流速度的前提下,调节焰流温度,以满足不同温敏材料涂层制备的工艺要求。通过调节悬浮液的体积流量,可以使悬浮液到达焰流中心被充分加热加速。适当减小悬浮液的体积流量有助于提高颗粒被基板捕捉时的温度与速度,适当提高或降低悬浮液的颗粒浓度可以在不影响颗粒被基板捕捉时速度的前提下,提高单位时间内的颗粒输出量或降低颗粒粒径,可以根据不同的工艺要求进行相应的调整。In order to study the flow field distribution and droplet/particle behavior in two-stage suspension high-velocity oxygen fuel spraying,three-dimensional Euler-Lagrange coupling modeling method was used to simulate the flow field and the process of suspension fragmentation atomization,motion heat transfer,evaporative diffusion and finally being captured by substrate.The suspension properties are compiled by an experiment-based fitting function and the influence of droplet shape changes is considered.The results show that:By adjusting the mass flow rate of nitrogen,the flame flow temperature can be adjusted without affecting the flame flow velocity,so as to meet the technological requirements of coating preparation of different temperature-sensitive materials.By adjusting the volume flow rate of suspension,the suspension can reach the center of flame flow and be heated and accelerated sufficiently.Appropriately reducing the volume flow rate of suspension is helpful to improve the temperature and velocity of particles captured by substrate,appropriately increasing or decreasing the particle concentration of suspension can increase the particle output per unit time or reduce the particle size without affecting the velocity of particles captured by substrate,which can be adjusted according to different process requirements.

关 键 词：悬浮液 超音速火焰喷涂 数值模拟 多相流 TIO2 

分 类 号：TK121[动力工程及工程热物理—工程热物理]