为研究1.0×104≤Re≤3.5×104范围内不同结构参数的螺旋复合型槽纹管的管外流动和换热情况，为结构优化设计提供参考，文中采用Realizable k-ε湍流模型模拟了恒壁温条件下壳程流体的对流换热过程，考察了结构参数（螺距和槽深）对流场、温度场和其他湍流特征的影响。结果表明：壳程的流动情况不如管程剧烈，但由于螺旋槽纹部分的长度选取得当，整个流域内都存在二次流，流体的换热能力得到了增强，同时也导致了压力损失的增加；当螺旋复合型槽纹管的螺距比为3.50时，综合换热能力评价指标最高；当槽深比为0.22时，换热能力提升得最多，但引起的压力损失也最大。

To study the fluid flow and heat transfer condition outside the hybrid smooth and spirally corrugated tube at Re=1.0×104~3.5×104 and provide reference for structure design optimization, the Realizable k-ε turbulence model was used to simulate the convective heat transfer process on the shell-side under constant wall temperature, and the effects of geometrical parameters including pitch p and corrugation depth e on the flow field, the temperature distribution and other turbulent statistics, were explored. Results indicate that the swirl flow out of the hybrid smooth and spirally corrugated tube is less violent than that in the tube-side; the secondary flow exists in the entire domain and the heat transfer performance is enhanced consequently, resulting in the increase of pressure loss simul-taneously; the hybrid smooth and spirally corrugated tube with pitch ratio p/D=3.50 has a superior thermal-hydraulic performance; the tube with corrugation depth ratio e/D=0.22 holds the highest local Nusselt number and the largest pressure drop.