【摘要】 采用CFD(computational fluid dynamics)数值模拟的方法，对电极感应熔炼气雾化（electrode induction melting gas atomization, EIGA）导流管不同伸出长度进行模拟计算，分析了导流管伸出长度对流场结构和粉末粒径的影响规律.结果表明，导流管伸出长度为0 mm时，回流区内的速度最大值为335 m/s，气体出口处的膨胀波簇明显变大，会出现反喷现象.随着导流管伸出长度的增加（1～4 mm），回流区的长度逐渐增加，且所制备的合金粉末的平均粒径先减小后增大.导流管伸出长度为2和3 mm时，抽吸压力最大，利于液滴二次破碎.导流管伸出长度为2 mm时，粉末粒径分布均表现为单峰的正态分布形态，粉末的中位粒径d50为84μm，粒径分布最均匀，粒径范围最窄.更多还原

【Abstract】 A computational fluid dynamics(CFD) approach was developed to simulate the EIGA(electrode induction melting gas atomization) with different protrusion lengths of delivery tube.The effect of the protrusion length of delivery tube on the flow field structure and powder particle size was analyzed. The results show that when the protrusion length is 0 mm, the maximum velocity in the recirculation zone is 335 m/s, and the expansion wave cluster at the gas outlet increased significantly, resulting in backflow phenomenon. With the increase of the protrusion length(1～4 mm), the length of the recirculation zone gradually increases, and the average particle size of the alloy powder prepared first decreases and then increases. The maximum suction pressure is achieved at 2 and 3 mm of protrusion length of delivery tube, which is beneficial to the secondary fragmentation of liquid droplets. When the protrusion length is 2mm, the particle size distribution of the powders shows a normal distribution, and the median diameter(d50) of the powders is 84 μm, which is the most uniform particle size distribution and the narrowest particle size range.更多还原