中间包水口吹氩过程壁面氩气膜的形成与迁移行为研究

连铸中因氧化铝等高熔点夹杂物粘附在水口内壁，导致中间包水口出现堵塞现象，严重扰乱生产节奏并恶化铸坯质量。生产中常采用水口吹氩操作，若在水口壁面形成稳定、连续的氩气膜，则可有效防止水口堵塞。然而，吹氩参数、上水口透气性参数、水口内壁附近钢液流动状态、滑动水口开口度等因素与水口壁面氩气膜形成和稳定行为之间有何关联？水口壁面氩气膜的厚度、传热和受力行为对其稳定性有何影响？氩气膜沿水口内壁向下迁移、破裂行为与各影响因素之间有何关系？气膜破裂后进入水口内部氩气泡的分布状态对夹杂物的捕捉和粘附行为有何影响？这些问题前人研究很少，本项目将以解决这些问题为目标，通过中间包水口吹氩水模型实验和低熔点金属热态模拟实验的研究方法，结合理论计算和数值模拟分析，明确水口吹氩条件下水口壁面形成稳定、连续氩气膜的调控机制，为最终优化水口吹氩工艺参数及上水口透气性参数，防止水口堵塞和提高铸坯质量提供理论基础和技术依据。

Due to the inclusions of high-melting point such as aluminium oxide adhering on the inner surface of nozzle, the clogging of tundish nozzle frequently occurs during continuous casting of steel. It seriously disturbs the production rhythm and degrades the steel quality. Generally, the argon blowing in tundish nozzle was employed in the actual production, aiming to effectively prevent the clogging of nozzle by means of the stable and continuous argon film on inner surface of nozzle. However, how do the argon blowing parameters, the permeability parameters of upper nozzle, the flow rate of molten steel near the inner surface of nozzle, and the opening degree of sliding nozzle relate to the formation and stability behaviors of argon film on inner surface of nozzle? How do the thickness of argon film, the heat transfer behavior and mechanical behavior of argon film affect on the stability of argon film? How do above influence factors affect the behaviors of downward migration and rupture of argon film along nozzle surface? How do the distribution of argon bubbles in molten steel after rupture of argon film affect on the entrapment and attachment of inclusions to argon bubbles? In order to solve these problems that were rarely reported in the previous studies, the water model experiments, the thermal simulation experiments of low-melting point metal, and the theoretical calculation and numerical simulation analysis of argon blowing in tundish nozzle will be studied in this project. Then, the stability mechanism and influence factors of argon film on inner surface of nozzle will be clarified clearly, which can provide theoretical and technology basis to the parameter optimization of the blowing argon parameters and permeability of upper nozzle in order to prevent the clogging of tundish nozzle and improve strand quality of steel.