大型气候实验室气流组织仿真分析

Airflow Distribution for Large Climatic Test Laboratory

目的对大型气候实验室气流组织进行仿真分析,获得合理的气流组织设计方案。方法首先通过分析旋流风口的特性,建立旋流风口CFD简化模型,然后设计大型气候实验室气流组织形式,最后对极端低温和极端高温工况下不同温度、送风量和送风角度时的气流组织进行CFD仿真分析。结果低温工况时,地面温度升高将导致室内温度和温度不均匀度整体上升;高温工况时,气流难以抵达地面,且地面温度对高度5 m以下区域有显著影响,对5 m以上空间影响不显著,应增大送风角度,使送风射流方向尽可能向下,以改善地面附近温度均匀性。结论气流组织仿真分析方法和气流组织设计方案适用于大型气候实验室设计。

Objective To have simulated analysis on airflow distribution of large climatic test laboratory and obtain a reasonable designing scheme for airflow distribution.Methods First,a simplified vortex diffuser CFD model was studied based on the flow characters;then the airflow distribution of large climatic test laboratory was designed.At last,two conditions:extreme low temperature and extreme high temperature under different floor temperature,air flow rate and air jet flow angle were studied using CFD method.Results For low temperature test,the rise of floor temperature would lead to overall increase of chamber temperature and un-uniformity.For high temperature test,it’s difficult for air jet flow to reach the floor.The ground temperature had significant influences on the area lower than 5 m and had no significant influences on the space higher than 5 m.It was better to change the air jet flow angle to allow the air jet flow to reach the floor to improve the temperature uniformity near the ground.Conclusion The air flow distribution simulated analysis and design scheme are applicable to design of large climatic laboratory.