对相同质量流量下的光管、双层光管、带冷却结构（肋、扰流柱、凹坑、螺旋通道）的双层管等不同结构的管流动进行了流固耦合三维数值模拟，获取了固体壁温的分布特征；对各结构下，外层壁冷热侧温差、冷气温升、流动特性及综合换热效率进行了研究分析。研究结果表明：相同质量流量下，带螺旋通道双层管的外层壁冷热侧温差最小、综合换热效率最高；凹坑结构双层管与双层光管的流动及换热特性相似，流阻较小但换热效果也较差；扰流柱和肋结构双层管的流动换热特性相近，其温度分布均匀性、换热量介于双层光管和螺旋通道双层管之间，其流阻大且综合换热效率低。

A 3D numerical simulation of fluidsolid coupling was carried out under the same mass flow for the flow in tubes with different structures, such as general tube, general doublewall tube, doublewall tube with cooling structures of ribs, pin fins, pits and spiral channel. The distribution characteristics of solid wall temperature of tube were obtained, and the temperature difference between the hot and cold sides of the outer wall, cold air temperature rise, flow characteristics and comprehensive heat transfer efficiency are analyzed under each structure. The research results show that the temperature difference between the hot and cold sides of the outer wall of the doublewall tube with spiral channel is the smallest, and the comprehensive heat transfer efficiency is the highest under the same mass flow; the flow and heat transfer characteristics of the doublewall tube with pits structure are similar to those of the general doublewall tube, which flow resistances are smaller but heat transfer effects are worse; the flow and heat transfer characteristics of the doublewall tube with pin fins structure are similar to those of the doublewall tube with ribs structure, which temperature distribution uniformity and heat transfer amount are in the range between those of general doublewall tube and doublewall tube with spiral channel, flow resistances are larger and comprehensive heat transfer efficiencies are lower.

V231.1

国家科技重大专项（2017-Ⅲ-0001-0025）