双带式非晶薄板连铸熔池流动传热数值模拟

Numerical Simulation on Fluid Flow and Heat Transfer in Molten Pool of the Twin-belt Amorphous Alloy Strip Caster

以非晶合金新型双带连铸工艺为研究对象,考虑气体层与自由液面之间的交互作用,建立了熔池流动传热三维VOF两相流模型,通过对比分析,验证了新型布流器结构设计的合理性,考察了布流器水口倾角和浸入深度对熔池流场和温度场分布的影响。结果表明,新型布流器能够有效地降低熔池侧封区自由液面的波动程度;随着水口倾角和浸入深度的变化,熔池自由液面的波动速度和温度分布,均表现出强烈的"双波峰"现象;布流器水口倾角每增加15°,液面波动速度波峰约减小0.015m/s,温度波峰约减小10℃;水口浸入深度每增大5mm,液面速度波峰约减小0.01m/s,温度波峰约减小15℃;当水口倾角为30°,浸入深度为25mm时,熔池流场和温度场分布最为合理。

Based on the twin-belt jet cooling caster which was designed to prepare the amorphous alloys strip,a VOF three-dimensional thermal-hydraulic coupling model of molten pool was established by considering interactions between liquid and air layer.The rationalization of the new feeding system structure design was validated by comparative analysis.The influence of nozzle angle and immersion depth on flow and temperature fields distributions was investigated.The results show that the new feeding system can reduce level fluctuation in side confinement effectively,and both flow and temperature field present a kind of"double waves"phenomenon with nozzle angle and immersion change.With every additional 15°nozzle angle of the feeding system,the liquid surface speed waves are reduced by 0.015 m/s and the temperature waves are reduced by 10℃,while each additional 5 mm immersion depth,the liquid surface speed waves are reduced by 0.01 m/s and the temperature waves are reduced by15℃.In addition,flow and temperature fields are distributed more reasonable when nozzle angle is 30°and immersion depth is 25 mm.