目的 研究凹印机烘干装置风嘴横风板结构参数与风场分布的关系， 以提高烘干系统热风利用效率。方法 通过流体力学输纸模拟计算， 对比仿真计算分析不同宽度横风板风嘴的风场， 选取风场的迹线图和承印物表面的压力分布为主要评估标准， 分析了涡流、 迹线和压力分布随横风板长度的变化规律。结果 随着横风板长度的增加， 涡流逐渐向承印物表面接近， 迹线在承印物表面处密度增加， 承印物表面整体压力略有下降， 压力分布更加均匀。结论 在风嘴出风口区域增加横风板有利于提高热风利用率， 可使承印物表面风场分布更加均匀。为凹印机烘干风嘴结构设计及优化提供了理论依据。

Objective To study the relationship between the length of cross-wind-board of nozzle in gravure printing and the heated air filed, in order to improve the hot wind utilization efficiency of the drying system. Methods The wind filed of drying nozzle with different length was analyzed through fluid simulation calculation. Trajectories and pressure distribution were taken as the evaluation parameters to study the fluid field, and the variation rules of vortex, trace and pressure distribution with the length of cross-wind-board were analyzed. Results It was found that cyclone became closer to the substrate surface and trajectories became more concentrated with the incensement of length of cross-wind-board. Meanwhile, the pressure decreased slightly and the distribution was more uniform. Conclusion It was proved that the cross-wind-board could improve the utilization efficiency of hot wind and make the distribution of wind field on the substrate surface more even. This work provides theoretical reference for the structural design and optimization of the drying nozzle in gravure printing machine.