欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2020, Vol. 20 ›› Issue (5): 531-539.DOI: 10.12034/j.issn.1009-606X.219277

• 流动与传递 • 上一篇    下一篇

热风循环隧道烘箱的流场模拟及结构优化

王志奇*, 邹玉洁, 刘柏希, 张振康   

  1. 湘潭大学机械工程学院,湖南 湘潭 411005
  • 收稿日期:2019-08-20 修回日期:2019-09-24 出版日期:2020-05-22 发布日期:2020-05-18
  • 通讯作者: 王志奇

Flow field simulation and structure optimization of hot air circulation tunnel oven

Zhiqi WANG*, Yujie ZOU, Baixi LIU, Zhenkang ZHANG   

  1. School of Mechanical Engineering, Xiangtan University, Xiangtan, Hunan 411005, China
  • Received:2019-08-20 Revised:2019-09-24 Online:2020-05-22 Published:2020-05-18
  • Contact: WANG zhizhi qi

摘要: 采用CFD数值模拟方法研究热风循环隧道烘箱的内部温度及流场分布,提出了6种结构优化方案,考察了不同方案下的气流分布特性。结果表明,烘箱出口面局部温差在1 K以内,温度分布较均匀;气流速度分布是影响烘干品质的主要因素,原始结构下出口气流分布极不均匀,出口面角落位置出现局部高速区,最大速度达3.48 m/s,平均速度为0.94 m/s,相对均方根值为0.73;相比原始结构,6种改进方案中,弯头三隔板结构出口面的相对均方根值最低,最大速度降低51.4%,最佳风速区域占比提升至75.17%,整流效果最明显;弯头内设置三块隔板后,风罩内再设置隔板对气流均匀性的改进作用不大。

关键词: 隧道烘箱, 多孔介质, 气流均匀性, 数值模拟, 结构优化

Abstract: Sterilizing tunnel oven is the key equipment to realize aseptic production in the pharmaceutical industry. The uniformity of air flow is the key index of sterilizing effect, which is influenced mainly by the structure of sterilizing oven. Therefore, the rational design of oven internal structure is an important way to achieve uniform airflow. However, there are few researches on the uniformity of air flow in the sterilizing oven. A hot air circulation tunnel oven was taken as the research object, the CFD numerical simulation method was used to study the internal temperature and flow field of the oven, and six optimized structures were proposed according to the internal flow condition of the tunnel oven, and the airflow distribution characteristics of different optimized structures were compared and analyzed. The results showed that the local temperature difference at the outlet of the oven was less than 1 K, the temperature distribution was relatively uniform. The air velocity distribution was the main factor affecting the drying quality, while the high-speed airflow cannot spread evenly because of the small space of the fan cover. The flow distribution of outlet was extremely uneven under the original structure, and there was a local high-speed region at the corner of the outlet surface. The maximum speed was 3.48 m/s, the average speed was 0.94 m/s, and the relative root mean square of airflow velocity was 0.73. Compared with the original structure, the maximum outlet velocities of the six optimized structures were significantly reduced. The percentages of the optimum velocity range increased in different degrees and the airflow uniformity was improved. While the elbow structure with three baffles had the lowest relative root mean square value of the outlet, the maximum speed decreased by 51.4%, the percentage of the optimum speed area increased to 75.17%, and the rectification effect was the most obvious. At the same time, after setting three baffles in the elbow, setting baffles in the fan cover had little effect on improving airflow uniformity, which provided a reference for improving airflow uniformity of the hot air circulation tunnel oven.

Key words: tunnel oven, porous media, flow uniformity, numerical simulation, structural optimization