以新型麻面管式过热器交叉流道为研究对象，采用三维数值模拟的方法，研究了麻面管交叉流动和换热特性及蒸汽侧流速u、凸胞/凹坑投影直径d、深度h、间距p等参数的最优值。结果表明：由于管内外壁面存在周期性凸胞/凹坑，壁面附近流体域和主流体域的混合加剧，对近壁处边界层有较好的扰动作用，改善了流体速度场与温度场的协同性，实现强化换热；与光滑管相比，麻面管烟气侧努塞尔数Nu o提升了58%左右，蒸汽侧努塞尔数Nu i提高了35%~50%，阻力系数f增加了7%~40%，综合换热性能指标PEC处于1.25~1.5间；基于响应面法，以Nu i、f、PEC为目标函数，得到蒸汽侧最优参数组合d=6.0 mm，h=1.0 mm，p=16.0 mm，u=4.8 m/s，对应的Nu i=680.55，f=0.014 68，PEC=1.43；运用多元线性回归的方法，分别拟合出蒸汽侧换热与阻力的准则关联式。

With the pitted tube superheater with cross flow path as the research object,threedimensional numerical simulations are performed to investigate the cross flow and heat transfer characteristics and to find the optimum value of the velocity(u),projection diameter(d)、depth(h)、spacing(p) of dimples/pits on steam side.The results show that the mixing of the flow domain near the wall surface and the main flow has intensified due to the existence of periodic dimples/pits on the inner and outer wall of the tube,which has a good disturbance effect on the boundary layer.The periodic dimples/pits of the pitted tube improve the synergy of velocity and temperature field and enhance heat transfer effect.The Nusselt number(Nuo) on the gas side of the pitted tube is increased by 58%,compared with the smooth tube.The Nusselt number(Nui) on the steam side is increased by 35%~50% while the resistance coefficient(f) is increased by 7%~40%,and the overall heat transfer performance evaluation criterion(PEC) is between 1.25 and 1.5.Based on the response surface method with Nui,f and PEC serving as the objective function,the optimal parameter combination of d=6.0 mm，h=1.0 mm，p=16.0 mm，and u=4.8 m/s is obtained while the corresponding parameters for objective functions are Nu=680.55，f=0.014 68，and PEC=1.43.The criterion formula of heat transfer and resistance on the steam side are obtained by the method of multiple linear regression.

TK121