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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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薄板坯连铸结晶器非稳态湍流大涡模拟研究
DOI: 10.3724/SP.J.1037.2011.00464, PP. 23-32
Keywords: 连铸结晶器,非稳态,大涡模拟,漩涡
Abstract:
本文利用大涡模拟模型分析薄板坯连铸钢液非稳态湍流特性,其中非稳态湍流流动N--S方程采用盒式函数进行滤波处理,亚格子模型采用Smagorinsky-Lilly模型.将大涡模拟结果与粒子图像测速及超声探伤结果进行分析比较来校正模型.通过对薄板坯连铸过程进行数值分析,获得了结晶器内非稳态钢液湍流的流动特征,包括流场的漩涡分布及大涡拟序结构的形成、发展、脱落和破碎过程,并发现即使水口和结晶器在几何上完全对中,结晶器内湍流分布也不对称,偏流产生是必然的,同时导致弯月面较强的波动.随着非稳态时间的延长,结晶器内钢液偏流在两侧呈现周期性变化,周期约为40s.
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