| 摘要: |
| 传统冷库空气幕通常以出口风速的研究作为提高阻断效率的重点，对射流风速在沿程上的持续性缺乏关注。本文通过对空气幕装置进行三次针对风速优化的结构性设计改造（改进安装了小型静压箱和渐缩喷口；在静压箱中安装导流叶片；设置回风系统）以减少空气幕射流沿程快速衰减。通过搭建空气幕性能测试实验台，对所设计空气幕沿程风速衰减情况进行测量，使用气体示踪法计算了不同配置空气幕的阻断效率。结果表明：加装静压箱和渐缩喷口对送风前半程的风速提升较大，安装导流叶片对风速库门后半程的风速优化影响较大，回风系统会使后半程风速显著提高；冷风渗透实验中单层风幕、双层风幕和三层风幕的密封效率分别为0.16、0.19和0.22，单层循环风幕、双层循环风幕和三层循环风幕的密封效率分别为0.29、0.38和0.43。 |
| 关键词: 空气幕；气流组织 风速衰减；冷风渗透 |
| DOI： |
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| 基金项目: |
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| Optimization of Air Curtain Airflow Organization and Air Penetration Experiment in Cold Stores |
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Wang Yabo, Yin Yucheng, Liu Xinghua, Shi Cong, Bian Dinghui, Li Yiming
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| (Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerc) |
| Abstract: |
| In cold store facilities, such as cold rooms and fresh storage warehouses, air curtains are usually installed at the door to reduce the loss of cooling capacity caused by opening the door during operation. Traditional air curtains have disadvantages such as high wind speed attenuation and poor sealing performance. Therefore, in this study, three structurally independent design are developed, aiming to optimize the wind speed through the air curtain device as follows: an improved small static pressure box and the tapered nozzle is installed, guide vanes are installed in the static pressure box, and the return air system is installed. Additionally, an optimization of the air curtain airflow organization and the sealing effects of the cold storage are studied. The wind speed at various points of the air curtain's outlet section is measured to determine the decrease in the wind speed as it traveled 1.2 m from the outlet. The effectiveness of the air curtain in sealing a warehouse door is also evaluated by using a gas tracer method to examine cold air penetration under different configurations of the air curtain system. The results show that the installation of the static pressure box and tapered nozzle significantly increases the wind speed in the first half of the air supply, and the installation of the guide vanes has a greater impact on the wind speed in the second half of the wind speed storehouse door. The return-air system increases the wind speed in the second half. The sealing efficiencies of the single-layer air curtain, double-layer air curtain, and three-layer air curtain in the cold air penetration experiment are 0.16, 0.19, and 0.22, respectively, and those of the single-layer circulating air curtain, double-layer circulating air curtain, and three-layer circulating air curtain are 0.29, 0.38, and 0.43, respectively. |
| Key words: air curtain airflow organization wind speed attenuation cold air penetration |
