增材制造用气雾化制粉工艺数值模拟及机理分析  

Numerical simulation and mechanism analysis of gas atomized pulverizing process for additive manufacturing

作　　者：王长军[1] 刘雨[1] 曹呈祥 郎童 马聪慧 谢琰军 WANG Changjun;LIU Yu;CAO Chengxiang;LANG Tong;MA Conghui;XIE Yanjun;无(Central Iron&Steel Research Institute,Beijing 100081,China;PERA Global,Beijing 100025,China)

机构地区：[1]钢铁研究总院,北京100081 [2]安世亚太科技股份有限公司,北京100025

出　　处：《粉末冶金工业》2021年第4期22-28,共7页Powder Metallurgy Industry

摘　　要：本文采用计算流体力学的数值模拟计算手段,结合实际工业生产数据,分析了雾化气体温度和压强对气雾化工艺过程中超音速流场分布的影响,以及其对最终金属粉末细粉收得率的综合作用。研究结果表明,随着气体温度增加,雾化区域平均温度升高,雾化区域平均气流速度增加,理论上更容易制备细粉;另外,随着雾化气体压强的增加,温度升高促进细粉收得率增加的影响程度逐渐减弱,甚至会导致在高压雾化气体情况下,升高温度导致细粉收得率降低。因此,雾化气体压强的增加对细粉收得率的提高起决定性作用。综合分析,需优化工艺参数,从而保证制备粉体的细粉收得率,以提高雾化效率和降低生产成本等。Using a numerical approach of computational fluid dynamics(CFD), the effects of atomizing gas temperature and pressure on the supersonic flow field distribution and powder yield were studied in comparison to industrial production data. The result shows that with the atomized gas increased, the average temperature and velocity of the atomization area increase, which is theoretically beneficial to the finer powder production. Besides, as the pressure of the atomized gas increases, the average temperature of atomized region reduces and the average velocity increases. Furthermore, with the pressure of atomized gas increased, the impact of temperature on the yield of finer powder gradually weakens, and even resulting in worse powder yield in case of high-pressure atomized gas.Hereby, the increased yield of finer powder is dominated by the additional pressure of atomized gas. Comprehensively, the parametric optimization should be carried out to ensure the high production efficiency of finer powder and reduce the manufacturing cost.

关 键 词：气雾化 数值模拟 粉体收得率 超音速流场 

分 类 号：TF123.2[冶金工程—粉末冶金]