电极感应熔化气体雾化制粉工艺气体流场模拟研究  

A simulation study of gas flow field in electrode induction melting gas atomization

作　　者：张雪良 陶宇[1,2] 贾建 曲敬龙[1,2] ZHANG Xueliang;TAO Yu;JIA Jian;QU Jinglong(High Temperature Materials Research Institute,CISRI,Beijing 100081,China;GAONA Aero Material Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司高温材料研究所,北京100081 [2]北京钢研高纳科技股份有限公司,北京100081

出　　处：《粉末冶金工业》2022年第4期8-16,共9页Powder Metallurgy Industry

基　　金：国防基础科研项目(JKCY2020512C001);国家科技重大专项资助项目(2017-VI-0008-0078)。

摘　　要：采用计算流体动力学FLUENT软件模拟研究了电极感应熔化气体雾化制粉工艺的气体流场状态,分析了雾化气体压力、气体温度以及熔化室与雾化室气体压力差对气体流场特征的影响规律。结果表明,不同工艺参数下,气体流场均为一系列膨胀波和压缩波形成的“项链状”射流结构;提高气体压力和温度能有效提高气体射流速度,理论上有利于熔体破碎,但气体压力过大会导致气体回流区影响范围增加,并向喷嘴中心孔(熔体下落通道)方向移动,可能会阻碍熔体下落,造成熔体喷溅;提高熔化室与雾化室气体压力差,能明显抑制气体回流区的形成,保证熔体顺利下落,但会使雾化室内气体射流速度下降,降低熔体破碎效果。In order to ensure the stability of atomization process, improve the production efficiency and the powder quality, clarifying the effects of atomization parameters on the properties of gas flow field is extremely important.The gas flow field of electrode induction melting gas atomization(EIGA) process was simulated by computational fluid dynamics software Fluent. The effects of gas pressure, gas temperature, and the pressure difference between the melting room and atomization room on gas flow field were analyzed. The results indicate that the gas flow field is a“necklace-like”structure formed by a series of expansion shocks and recompression shocks under different atomization conditions. The velocity of gas in atomization room is increased with the increasing of gas pressure and temperature, which is theoretically benefit for the melt breakup. But the influence range of the gas recirculation zone is increased and moves to the center hole of the gas nozzle(the falling channel of melt) when the gas pressure is too large, which may hinder the falling of the melt and cause melt splashing. Increasing the pressure difference between the melting room and atomization room was able to inhibit the formation of recirculation zone and ensure the falling of the melt smoothly, but it would reduce the gas velocity in atomization room and weaken the breakup of melt. Therefore, selecting an appropriate atomizing gas pressure and the pressure difference between the melting chamber and atomization room are necessary to ensure the stable of atomization process and improve the yield rate of fine powder. And increasing the temperature of atomization gas can increase gas jet velocity, which is beneficial to improve the crushing effect of melt.

关 键 词：电极感应熔化气体雾化 雾化气体特性 气体流场 数值模拟 

分 类 号：TF12[冶金工程—粉末冶金]