Li Fei, Liu Junjie, Ren Jianlin, Cao Xiaodong, Zhu Yifang
Tianjin Key Lab of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, CA 90095-1772, USA.
Int J Heat Mass Transf. 2016 May;96:287-295. doi: 10.1016/j.ijheatmasstransfer.2016.01.004. Epub 2016 Feb 4.
Airborne contaminants such as pathogens, odors and CO released from an individual passenger could spread via air flow in an aircraft cabin and make other passengers unhealthy and uncomfortable. In this study, we introduced the airflow vortex structure to analyze how airflow patterns affected contaminant transport in an aircraft cabin. Experimental data regarding airflow patterns were used to validate a computational fluid dynamics (CFD) model. Using the validated CFD model, we investigated the effects of the airflow vortex structure on contaminant transmission based on quantitative analysis. It was found that the contaminant source located in a vorticity-dominated region was more likely to be "locked" in the vortex, resulting in higher 62% higher average concentration and 14% longer residual time than that when the source was on a deformation dominated location. The contaminant concentrations also differed between the front and rear parts of the cabin because of different airflow structures. Contaminant released close to the heated manikin face was likely to be transported backward according to its distribution mean position. Based on these results, the air flow patterns inside aircraft cabins can potentially be improved to better control the spread of airborne contaminant.
单个乘客释放出的病原体、气味和一氧化碳等空气传播污染物，可能会通过机舱内的气流扩散，使其他乘客健康受损、感到不适。在本研究中，我们引入气流涡旋结构来分析气流模式如何影响机舱内污染物的传播。有关气流模式的实验数据用于验证计算流体动力学（CFD）模型。使用经过验证的CFD模型，我们基于定量分析研究了气流涡旋结构对污染物传播的影响。研究发现，位于涡度主导区域的污染物源更有可能被“锁定”在涡旋中，与污染物源位于变形主导位置相比，平均浓度高出62%，残留时间长14%。由于气流结构不同，机舱前后部的污染物浓度也有所不同。根据分布平均位置，靠近加热人体模型面部释放的污染物可能会向后传输。基于这些结果，有可能改善机舱内的气流模式，以更好地控制空气传播污染物的扩散。
