考虑气隙的电磁连铸圆坯传热凝固数值模拟

通过双向迭代耦合的方法,建立了电磁连铸结晶器区域内的传热凝固有限元分析模型.通过对凝固坯壳与结晶器接触状态的数学描述,来模拟软接触结晶器内的热和力学状态,研究了高频交变电磁场对气隙分布及铸坯温度场的作用规律.结果表明,采用双向迭代耦合的方法,可更准确地描述电磁软接触连铸结晶器内的热-力学行为;高频交变磁场下,钢液的初始凝固点位置较常规连铸下移,初始凝固壳减薄,气隙生长延迟;在结晶器下段,由于电磁力的搅拌作用凝壳厚度又有所增加,气隙量大于常规连铸.

Numerical Simulation of Heat Transfer and Solidification of Electromagnetic Continuous Casting Round Billet Considering Gap

A finite-element analysis model of heat transfer and solidification in electromagnetic continuous casting crystallizer area was established by a two-way coupled method. The contact state of solidified shell and mould was described to simulate the thermal and mechanical states of soft-contact mould. The effect of high-frequency alternating electromagnetic field on the distributions of gap and temperature in the billet was studied. The results showed that the thermal-mechanical behaviors in the electromagnetic soft-contact mould can be described accurately by the two-way coupled method. With the high frequency electromagnetic field, the solidification starting point moves downwards, the initial shell thickness gets thinner, and the gap size reduces at the initial solidification zone, but the shell thickness and the gap size increase at the outlet of mould.