刘琦, 谢承利, 李伟光, 等. 隔离舱室污染气体扩散的大涡模拟研究[J]. 中国舰船研究, 2021, 16(3): 67–73. doi: 10.19693/j.issn.1673-3185.01900
引用本文: 刘琦, 谢承利, 李伟光, 等. 隔离舱室污染气体扩散的大涡模拟研究[J]. 中国舰船研究, 2021, 16(3): 67–73. doi: 10.19693/j.issn.1673-3185.01900
LIU Q, XIE C L, LI W G, et al. Large eddy simulation of contaminants dispersion in ship isolation room[J]. Chinese Journal of Ship Research, 2021, 16(3): 67–73. doi: 10.19693/j.issn.1673-3185.01900
Citation: LIU Q, XIE C L, LI W G, et al. Large eddy simulation of contaminants dispersion in ship isolation room[J]. Chinese Journal of Ship Research, 2021, 16(3): 67–73. doi: 10.19693/j.issn.1673-3185.01900

隔离舱室污染气体扩散的大涡模拟研究

Large eddy simulation of contaminants dispersion in ship isolation room

  • 摘要:
      目的   开展船舶隔离舱室门动态开启过程中污染物对流扩散的研究,定量对比和评估不同负压工况下污染物中扩散量随时间的变化,对隔离病房负压系统的设计具有重要意义。
      方法   基于大涡模拟(LES)方法,结合示踪气体组分输运方程,对某型应急医疗救援船的隔离舱室门开启过程中污染物的对流扩散规律开展数值模拟研究,重点对不同压差工况下门动态开启过程中的流场特性及污染物扩散规律进行对比分析。
      结果   研究表明:以污染物总扩散量为评估指标,对空间离散精度和时间步长进行敏感性分析,可确保LES模拟结果的可靠性;在不同压差与门开启过程的诱导作用下,流体速度峰值和出现峰值的时间有明显差异;提高隔离病房负压值可以减小污染物扩散峰值,同时也可缩短已扩散污染物在压差作用下返回隔离病房的时间。
      结论   对隔离舱室负压系统设计和污染物动态扩散评估具有一定指导意义。

     

    Abstract:
      Objectives  Conducting studies on contaminant dispersion during the door-opening process of isolation rooms and quantitatively comparing and evaluating the diffusion characteristics of contaminated air under different negative pressure conditions is of great significance for the design of negative pressure systems for the isolation rooms of ships.
      Methods  Based on the large eddy simulation (LES) method and a combination of tracer gas component transport equations, numerical simulations were conducted to investigate contaminated air dispersion during the door-opening process of isolation rooms. The flow field characteristics and pollutant dispersion process during the dynamic opening of the door under different differential pressure conditions were then compared and analyzed.
      Results   The results show that the sensitivity analysis of mesh resolution and time step with total pollutant diffusion as the evaluation index can ensure the reliability of the LES simulation results. Further analysis shows that under the combination of different differential pressures and door-opening induced flows, there is a significant difference between the magnitude of the fluid velocity peak and the time when the peak appears. Increasing the negative pressure value of the isolation room can reduce the peak of pollutant diffusion and shorten the time for the diffused pollutant to return to the isolation room under the differential pressure.
      Conclusions  The results obtained in this paper can provide guidance for the design of ship isolation rooms.

     

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