高速列车空调系统车下风道内病毒灭活的数值模拟
Numerical simulation of virus inactivation in under-train air duct of high speed train air conditioning systems
摘要：
以新型冠状病毒为灭活对象，在CRH2型动车组空调系统车下风道内布置紫外线灯管。基于计算流体力学(CFD)建立了耦合空气流动、灯管发热、紫外辐射与颗粒物辐射剂量的数值计算模型，对不同布管方式下的病毒灭活效果进行了对比。结果表明：布置紫外线灯管可以延长颗粒物在车下风道内的平均过流时间，同时通过改变车下风道内灯管的布置方式，可以有效地改善车下风道内辐射场的分布并提高颗粒物受到的辐射剂量；在所研究的4种布管方式中，波浪状分布（D型分布）的车下风道内辐射场更加均匀，颗粒物接收的辐射剂量明显增大，远高于新冠病毒的D90灭活标准。
Abstract：
Taking SARS-CoV-2 as the target of inactivation, ultraviolet lamps are arranged in the under-train air duct of the CRH2 electric multiple unit air conditioning system. Based on computational fluid dynamics (CFD)， a numerical calculation model of coupled air flow, lamp heating, ultraviolet radiation and particulate radiation dose is developed, and the virus inactivation effects under different lamp arrangements are compared. The results show that the arrangement of ultraviolet lamps can increase the average flow time of particles in the under-train air duct. At the same time, changing the arrangement of the lamps in the under-train air duct can effectively improve the distribution of the radiation field and increase the radiation dose received by particles. Among the four types of lamp arrangements studied, the radiation field in the under-train air duct with wavy distribution (type-D) is more uniform, and the radiation dose received by particles increases significantly, which is much higher than the D90 inactivation standard of the SARS-CoV-2.
Keywords:SARS-CoV-2inactivation;highspeedtrain;under-trainairduct;ultravioletdisinfection;lamparrangement;CFD