Mei Dan, Duan Wenzhu, Li Yao, Li Jiaqian, Chen Wangsheng
Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China.
Hubei Provincial Industrial Safety Engineering Technology Research Center, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China.
Sustain Cities Soc. 2022 Sep;84:104011. doi: 10.1016/j.scs.2022.104011. Epub 2022 Jun 18.
In developing countries, public transportation is the first choice for the elderly because of its convenience and cheapness. The high density population of public transportation increases the risk of passengers contracting infectious diseases, so it is extremely critical to determine healthy transportation systems to safeguard the health of passengers. The propagation characteristics of droplets in the ZK-type public bus were studied by computational fluid simulation employing the Realizable k-ε turbulence model and discrete phase model. The modified Wells-Riley model was used to quantitatively assess the infection risk of SARS-CoV-2 spread by droplets on the elderly. The risk assessment shows that when the personalized air supply angle is 30°, the number of infected passengers is the least, reaching 14, which shows that the infection risk of passengers can be reduced through the design of personalized air supply angle. Regardless of the angle of the personalized air supply, the rear seats are in a low-risk area. Therefore, it's recommended that elderly passengers choose the rear seats of the public bus during the epidemic to prevent being infected. This study can provide a reference for healthy transportation systems to construct a healthy environment inside the public bus.
在发展中国家，公共交通因其便利性和低廉价格成为老年人的首选。公共交通的高密度人群增加了乘客感染传染病的风险，因此确定健康的交通系统以保障乘客健康极为关键。采用可实现k-ε湍流模型和离散相模型，通过计算流体模拟研究了ZK型公交车内飞沫的传播特性。使用改进的威尔斯-莱利模型定量评估了老年人飞沫传播新冠病毒的感染风险。风险评估表明，当个性化送风角度为30°时，感染乘客数量最少，为14人，这表明通过个性化送风角度设计可降低乘客感染风险。无论个性化送风角度如何，后排座位都处于低风险区域。因此，建议老年乘客在疫情期间选择公交车后排座位以防感染。本研究可为健康交通系统营造公交车内健康环境提供参考。
