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粉末冶金材料科学与工程  2018, Vol. 23 Issue (3): 229-237    
  理论研究 本期目录 | 过刊浏览 | 高级检索 |
基于CFD技术的超音速喷嘴两相流破碎机制研究
朱玲玲, 吴建军, 刘明翔, 隋大山, 崔振山
上海交通大学 材料科学与工程学院塑性成形系,上海 200030
A computational fluid dynamics (CFD) research on the atomization mechanism of two-phase flows in ultrasonic gas atomizer
ZHU Lingling, WU Jianjun, LIU Mingxiang, SUI Dashan, CUI Zhenshan
Department of plasticity Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
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摘要 采用CFD(computational fluid dynamics,计算流体力学)软件系统研究超音速气雾化喷嘴两相流的雾化过程。利用VOF(volume of fluid,流体体积)函数两相流模型模拟验证金属液不同质量流率下的2种初级破碎模式,并研究雾化压力和液体表面张力对金属液初级破碎过程的影响。模拟结果表明:金属液质量流率较小(0.053 kg/s)时,初级破碎模式为液膜破碎,金属液质量流率较大(0.265 kg/s)时,初级破碎模式为“微型喷泉”破碎;随雾化压力从0.5 MPa增加到1.5 MPa,初级破碎程度加剧,但雾化压力过高反而会削弱雾化效果;将金属液表面张力由1.2 N/m降至0.4 N/m,初级破碎时能够获得尺寸更细小的液滴,通过随后的二次破碎形成更加均匀细小的液滴,从而获得高质量的沉积锭。
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朱玲玲
吴建军
刘明翔
隋大山
崔振山
关键词 喷射成形CFD超音速喷嘴两相流破碎机制    
Abstract:The atomization process of gas-liquid two-phase flows in ultrasonic gas atomizer was analyzed using computational fluid dynamics software. The two kinds of primary-breakup models of liquid metal at different mass flow rates were verified by volume of fluid model, and the effects of atomizing pressure and liquid surface tension on the primary-breakup process were also studied. The simulation results indicate that the transformation of primary-breakup model will occur with decreasing the liquid mass flow rate. When the liquid mass flow rate is 0.053 kg/s, the primary breakup model is melt sheet, but when it is 0.265 kg/s, the primary breakup model is “fountain”. When the atomizing pressure increases from 0.5 MPa to 1.5 MPa, the primary-breakup degree aggravates. However, excessive atomizing pressure will weaken the atomization effect. The smaller-size drop can be formed in the primary-breakup process when the surface tension of liquid metal decreases from 1.2 N/m to 0.4 N/m. Through the following secondary-breakup, more uniform and finer powder particles and high-quality as-spray ingot will be obtained.
Key wordsspray forming    CFD    ultrasonic gas atomizer    two-phase flows    breakup mechanism
收稿日期: 2017-11-21      出版日期: 2019-07-12
ZTFLH:  TF123.112  
基金资助:国家自然科学基金资助项目(51675335)
通讯作者: 隋大山,副教授,博士。电话:021-62813;E-mail: dasui@sjtu.edu.cn   
引用本文:   
朱玲玲, 吴建军, 刘明翔, 隋大山, 崔振山. 基于CFD技术的超音速喷嘴两相流破碎机制研究[J]. 粉末冶金材料科学与工程, 2018, 23(3): 229-237.
ZHU Lingling, WU Jianjun, LIU Mingxiang, SUI Dashan, CUI Zhenshan. A computational fluid dynamics (CFD) research on the atomization mechanism of two-phase flows in ultrasonic gas atomizer. Materials Science and Engineering of Powder Metallurgy, 2018, 23(3): 229-237.
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