真空诱导熔化气体雾化中喷嘴堵塞：气体压力和熔体孔径耦合的影响

IF 1.9 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy Pub Date : 2023-03-16 DOI:10.1080/00325899.2023.2189083

Junfeng Wang, Min Xia, Jialun Wu, C. Ge

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引用次数: 0

摘要

摘要通过数值模拟和工业实验，研究了真空感应熔化气体雾化（VIGA）过程中紧密耦合喷嘴的堵塞问题。为了了解影响喷嘴回舔的因素，采用流体体积（VOF）多相流模型模拟来可视化合金熔体在一次雾化过程中围绕输送管外壁的运动。当熔体孔口直径为4mm，雾化压力接近3.5MPa时，雾化过程是连续的，粉末粒度很细，雾化器可以重复使用。当孔口直径为5mm，雾化压力大于2.5MPa时，避免了喷嘴堵塞的风险，粉末尺寸相对较粗。在使用相同雾化器结构的情况下，本研究解释了VIGA装置中回舔的机制以及由此产生的喷嘴损坏。

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Nozzle clogging in vacuum induction melting gas atomisation: influence of gas pressure and melt orifice diameter coupling

ABSTRACT The clogging problem of close-coupled nozzles in the vacuum induction melting gas atomisation (VIGA) process is studied by numerical simulation and industrial experiments. To understand the factors affecting lick back on the nozzle, volume of fluid (VOF) multiphase flow model simulation was adopted to visualise the motion of alloy melt around the outer wall of the delivery tube in the primary atomisation process. When the melt orifice diameter is 4 mm and the atomisation pressure is close to 3.5 MPa, the atomisation process is continuous, the powder particle size is fine, and the atomiser can be reused. When the orifice diameter is 5 mm, and the atomisation pressure is greater than 2.5 MPa, the risk of nozzle clogging is avoided, the powder size is relatively coarse. In the case of using the same atomiser structure, this study explains the mechanism of lick-back and the resulting nozzle damage in VIGA units.

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来源期刊

Powder Metallurgy 工程技术-冶金工程

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

3 months

期刊介绍： Powder Metallurgy is an international journal publishing peer-reviewed original research on the science and practice of powder metallurgy and particulate technology. Coverage includes metallic particulate materials, PM tool materials, hard materials, composites, and novel powder based materials.