摘要
两阶段悬浮液超音速火焰喷涂过程中的悬浮液溶剂的蒸发、固体颗粒沉积于基板时的温度和速度对最终形成涂层的性能有着至关重要的影响,因此有必要对悬浮液液滴和固体颗粒在流场中的换热和运动过程加以研究。在分析两阶段悬浮液超音速火焰喷涂原理的基础上,建立了两阶段悬浮液超音速火焰喷涂过程的传热和流动模型,通过使用DPM模型采用双向耦合的方式对TiO2悬浮液液滴注入超音速流场过程进行数值模拟。研究了不同掺混气体质量流量对液滴以及TiO2固体颗粒粒径、温度、速度的影响。模拟结果表明,氮气质量流量越高,沿轴线相同位置液滴粒径越大,液滴水分蒸发越慢,TiO2固体颗粒温度下降越明显,TiO2固体颗粒速度越大。
The evaporation of suspension solvent, the temperature and velocity of solid particles deposited on the substrate during the two-phase high velocity suspension flame spray process have a vital impact on the performance of the final coating. Therefore, it is necessary to study the process of heat transfer and movement of suspension droplets and solid particles in flow field. Based on the analysis of the principle of two-stage high velocity suspension flame spray, the heat transfer and flow model of two-stage high velocity suspension flame spray process was established in this paper. The process of titanium dioxide suspension droplet injected supersonic flow field was simulated by using DPM model and two-way coupling method. The effects of mass flow rate of mixed gases on the temperature and velocity of droplets and solid particles of titanium dioxide were studied. The change of droplet size and water content was also studied. The simulation results show that the higher the mass flow rate of nitrogen, the larger the droplet size at the same position along the axis is, the slower the droplet’s evaporation of water is, the faster the temperature of titanium dioxide solid particles decreases, and the greater the velocity of solid particles of titanium dioxide is.
作者
阚玉
单彦广
宫菲菲
KAN Yu;SHAN Yan-guang;GONG Fei-fei(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai200093,China)
出处
《能源工程》
2020年第2期19-24,共6页
Energy Engineering
基金
国家自然科学基金资助项目(51676130)。
关键词
火焰喷涂
传热流动
喷雾
数值模拟
flame spraying
heat transfer and flow
spray
numerical simulation
