Abstract: Based on the research prototype of an 18t tundish for three-strand unsymmetrical casting 250 mm X 280 mm bloom at Xining Special Steel, the effect of 3 kinds of flow control device on flow field of liquid in tundish is studied by using geometric similarity ratio 1： 2. 2 water model to get optimum new type baffle. Results show that the difference of average residence time and minimum residence time between tundish three strand nozzles in prototype tundish is bigger, it is unfavorable to uniformly control each strand casting； with using the optimum new U-type baffle, dead volume fraction of liquid in tundish decreases by 36. 6% and the standard deviation of average residence time of three nozzle decreases, it is favorable to uniformly control each strand casting.

摘要： 以西宁特钢三流非对称250 mm×280 mm方坯连铸18 t中间包为研究原型,应用1:2.2比例水模型试验和数学模拟相结合的方法研究3种控流装置对中间包流场的影响,得出一种优化的新型挡墙结构。结果表明,原型中间包3个水口间的平均停留时间和滞止时间相差较大,对各注流之间的均匀控制带来不利影响;使用新型的U形挡墙后,中间包内死区比例降低了36.67%,3个水口的平均停留时间标准差减小,有利于各流之间的均匀化控制。