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Numerical study on pollutant removal performance of vortex ventilation with different pollution source locations
Building Simulation ( IF 6.1 ) Pub Date : 2020-05-15 , DOI: 10.1007/s12273-020-0632-3
Yi Wang , Chao Zhai , Tongtong Zhao , Zhixiang Cao

This study presents the flow trajectory and pollutant distribution of a vortex ventilation system with different pollution source locations. First, the horizontal flow path and vertical structure of vortex ventilation are analyzed using the Burgers–Rott vortex model to predict the basic flow trajectory of pollutants in vortex ventilation system, and to provide a reference for the layout of pollution source locations in the following research. Thereafter, the flow characteristics of pollutants with different source locations in the vortex ventilation are studied numerically. The results indicate that, owing to the flow characteristics of the column vortex, the pollutant released from different pollution source locations has three flow modes: inflow mode, upward flow mode and downward flow mode, showing that the locations of pollution source have a significant impact on the flow mode and distribution of pollutants. Moreover, the ventilation effectiveness (VE) for pollutant removal and the mean residence time (MRT) of pollutants are used to evaluate the vortex ventilation. The results demonstrate that when the pollution source is located in the vortex tube, the ventilation system shows good performance in both VE and MRT; when the pollution sources are located outside the vortex tube, none of the sources show satisfying VE, whereas the MRT performance is good for severe sources. Finally, vortex ventilation systems are qualitatively divided into five regions for preliminarily predicting the pollutant removal performance for different pollution source locations.



中文翻译:

不同污染源位置的涡旋通风污染物去除性能的数值研究

这项研究提出了具有不同污染源位置的涡流通风系统的流动轨迹和污染物分布。首先,利用Burgers-Rott涡模型分析涡通风的水平流动路径和垂直结构,以预测涡通风系统中污染物的基本流动轨迹,并为后续研究中污染源位置的布局提供参考。 。此后,数值研究了涡流通风中不同源位置的污染物的流动特性。结果表明,由于柱涡的流动特性,从不同污染源位置释放的污染物具有三种流动模式:流入模式,向上流动模式和向下流动模式,表明污染源的位置对污染物的流动方式和分布有重大影响。此外,用于去除污染物的通风效率(VE)和污染物的平均停留时间(MRT)用于评估涡流通风。结果表明,当污染源位于涡流管中时,通风系统在VE和MRT上均表现出良好的性能。当污染源位于涡流管外部时,没有一个污染源显示出令人满意的VE,而MRT性能对于严重污染源而言是好的。最后,将涡流通风系统定性分为五个区域,以初步预测不同污染源位置的污染物去除性能。去除污染物的通风效率(VE)和污染物的平均停留时间(MRT)用于评估涡流通风。结果表明,当污染源位于涡流管中时,通风系统在VE和MRT上均表现出良好的性能。当污染源位于涡流管外部时,没有一个污染源显示出令人满意的VE,而MRT性能对于严重污染源而言是好的。最后,将涡流通风系统定性分为五个区域,以初步预测不同污染源位置的污染物去除性能。去除污染物的通风效率(VE)和污染物的平均停留时间(MRT)用于评估涡流通风。结果表明,当污染源位于涡流管中时,通风系统在VE和MRT上均表现出良好的性能。当污染源位于涡流管外部时,没有一个污染源显示出令人满意的VE,而MRT性能对于严重污染源是好的。最后,将涡流通风系统定性地分为五个区域,以初步预测不同污染源位置的污染物去除性能。结果表明,当污染源位于涡流管中时,通风系统在VE和MRT上均表现出良好的性能。当污染源位于涡流管外部时,没有一个污染源显示出令人满意的VE,而MRT性能对于严重污染源是好的。最后,将涡流通风系统定性地分为五个区域,以初步预测不同污染源位置的污染物去除性能。结果表明,当污染源位于涡流管中时,通风系统在VE和MRT上均表现出良好的性能。当污染源位于涡流管外部时,没有一个污染源显示出令人满意的VE,而MRT性能对于严重污染源来说是好的。最后,将涡流通风系统定性地分为五个区域,以初步预测不同污染源位置的污染物去除性能。

更新日期:2020-05-15
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