疫情下不同通风方式数值模拟分析对比

Numerical Simulation Analysis and Comparison of Different Ventilation Modes under COVID-19

针对当前部分办公室无法满足人体舒适性要求及室内人员分布密集,其感染风险未知等问题,本文采用计算流体力学(CFD)模拟了混合通风、置换通风和层式通风条件下浙江某高校办公室内的气流组织,并使用改进的Wells-Riley模型将CO_(2)作为污染物浓度变量预测了三种通风方式下空间中污染物浓度的致病性感染概率,为疫情防控下室内通风方式的选择提供一定的参考。模拟结果表明:置换通风条件下室内温度场分层明显;三种通风条件下都不会对人员产生不舒适的吹风感;三种通风方式只有置换通风条件下室内CO_(2)浓度含量达到1000 PPM以下,感染概率低于其他两种,明显置换通风方式优于其他两种通风方式。

To address the current problems that some offices cannot meet the requirements of human thermal comfort and the unknown risk of infection due to the dense distribution of indoor personnel,In this paper,we used computational fluid dynamics(CFD)to simulate the airflow organization in the office of a university in Zhejiang under the conditions of mixed ventilation,displacement ventilation and laminar ventilation,and used the improved well This paper predicts the probability of pathogenic infection by using a modified Wells-Riley model with CO_(2)as the pollutant concentration variable in the space under the three ventilation methods,and provides some reference for the selection of indoor ventilation methods under epidemic prevention and control.The simulation results showed that:the indoor temperature field stratification was obvious under the replacement ventilation condition;all three ventilation conditions did not produce uncomfortable blowing sensation to the personnel;only under the replacement ventilation condition,the probability of infection was lower than the other two when the indoor concentration of pollutants reached below 1000,and the replacement ventilation was obviously better than the other two ventilation methods.