多种送风系统下封闭空间污染物扩散规律研究

Study on the Pollutant Distribution in Enclosed Space Based on Multiple Air Supply Modes

以医院某封闭输液室内病毒颗粒物传播规律为研究对象,通过建立物理和数学模型,采用CFD数值模拟技术对室内病毒颗粒物传播轨迹随室内空气速度、温度和病毒颗粒物浓度的变化规律进行研究,结果表明对于座扶进侧上回系统形式,当送风速度为0.5 m/s时,空间内医生口鼻处速度平均值是最小的,约为0.019 m/s,比传统上中进侧下回系统低90.9%;而对于患者间的高风速环境,可有效减少患者之间交叉感染风险。对于传统的侧上进侧下回系统形式,整个封闭空间内相对平均温度最低,更多的新鲜空气进入能够为医护人员提供更好的防护环境,且整个空间温度分布均匀,确保人体的热舒适性。

The transmission of virus particles in a closed infusion room of a hospital was taken as the research object,and by establishing physical and mathematical models,CFD was used to study the variation of the virus particle transmission in the closed infusion room with the indoor air velocity,temperature and virus particle concentration.The results showed that for the seat supply-upper return air system,when the air supply speed is 0.5 m/s,the average speed of the doctor's mouth and nose inside the enclosed space is the smallest,about 0.019 m/s,which is 90.9%lower than the traditional air supply system.For the high wind speed environment between two patients,it can effectively reduce the risk of virus cross-infection between patients.For the traditional side-up-supply and side-down-return system,the relative average temperature in the entire enclosed space is the lowest and fresher air can provide a better environment for medical staff,and the temperature distribution is even,ensuring the thermal comfort of the human body.