中文摘要：

为解决双金属复合管固-液铸轧复合（SLCRB）工艺覆层熔体金属的环形均匀稳定布流问题,提出并设计了一种带有三级环形阶梯分流和锥形缓冲的环形布流器,并且基于商用软件Fluent建立了稳态布流过程的流体动力学模型,分析了布流器结构和铸轧速度对系统流场的影响,给出了获得均匀、稳定出口流场的布流器内部结构和布流条件,并用水模实验进行验证。结果表明：布流器内通道高宽比不小于1有利于均匀分流,并且锥形缓冲区的均流缓冲作用至关重要。以1.2m/min的铸轧速度成功制备了外径为38mm、内径为26mm的铅-铝双金属复合管,覆层金属厚度均匀、界面结合效果良好。

英文摘要：

In order to solve the problems of annular uniform and stable flow distribution for the cladding molten metal in the solid-liquid cast-rolling bonding（SLCRB）process of bimetallic clad pipes,an annular delivery device comprised with three-level annular stepped shunts and the tapered buffer was proposed and designed.Besides,the fluid dynamics model during the steady flow distribution process was established based on the commercial software Fluent.The influence of the delivery device structure and the cast-rolling speed on system flow field was analyzed,and the internal structure and flow distribution conditions of delivery device were presented to obtain a uniform and stable outlet flow field,which was verified by the water model experiment.The results show that it contributes to the uniformly flow distribution if the aspect ratio of the annular delivery device channel is no smaller than 1,and the stream buffer action of the tapered buffer region is crucial.The Pb-Al bimetallic clad pipes with outer diameter of38 mm and inner diameter of 26 mm was produced successfully at the cast-rolling speed of 1.2m/min.The thickness of the cladding metal is uniform and the combined effect at the interface is well.