包装印刷设备的风嘴流场分析及优化

目的对包装印刷设备风嘴附近流场区域进行数值仿真分析,并以此为依据对其进行外侧风嘴角度的优化。方法以计算流体力学为理论基础,按照实际设备烘箱结构进行模型构建、网格切分、数值计算、特征评估,分析流畅特性,并以承印物表面为依据确定最优参数范围。结果获取了风嘴至承印物之间的流场分布,并对承印物表面的温度场、速度场、压力场进行了全面评价,获取了均值、方差、极差等主要特征。结论风嘴排列结构的外侧风嘴角度对温度场、速度场、压力场分布有着明显影响,最佳角度为150°或120°附近,应避免出现在135°附近。

Flow Field of Air Nozzle of Package Printing Equipment and Its Optimization

The work aims to conduct a numerical simulation analysis on the flow field near the air nozzle of package printing equipment, and then optimize the angles of outside air nozzle according to the results. With the calculation of fluid mechanics as theoretical basis, model building, grid division, numerical calculation and feature evaluation were conducted according to the oven structure of the actual equipment, to analyze the characteristics of flow field. With the printed material surface as the basis, the optimal parameter range was determined. The distribution of the flow field between the air nozzle and the printed material was obtained. Moreover, an overall evaluation for the temperature field, velocity field and pressure field of the printed material surface were made. The major characteristics, such as mean value, variance and range, were obtained. As for the arrangement structure of the air nozzle, the angle of outside air nozzle has a significant influence on the temperature field, velocity field and pressure field. The best angle is near 150° or 120°, and it should not occur around 135°.