摘要
外界染毒人员通过防护工程口部携入的有毒污染物会破坏内部安全性。使用高精度曲面3维人体模型,结合雷诺时均方程与大涡模拟耦合的方法模拟人员通过防护工程口部时卷携颗粒污染物的过程。首先以人体尾涡扩散过程和门洞断面的速度通量为考察对象,描述尾涡演化规律,然后改变行进速度、初始距离,考察速度通量对这些因素的敏感程度,完成人员行进特征流场的研究;通过计算行进方向上断面的不均匀度和清洁空间的污染物累积量,描述污染物向清洁区扩散的时空变化过程,完成对携入污染物过程的研究。结果表明:与国外相关文献工作相比,该方法可以较小的计算资源捕捉到相似的尾涡发展扩散过程;人员通过门洞时间与携入的污染物体积分数出峰时间(Tp)线性相关,且其与峰值(Vmax)呈指数关系,携入清洁室的污染物约占污染物总量的3%。
The paper attempts to bring about numerical simulation results of the contaminant dispersion induced by human crossing the gate of a civilian protective engineering.Due to the complicated and instable nature of the physical experimental condition, we＇ve decided to adopt a large eddy simulation model coupled with RANS （Reynolds Averaged Navier-Stokes equation model） along with a compounded moving mesh so as to make sure the precision of the simulated results as well as to reduce the calculation load to ensure the detecting efficiency. To achieve the goal, the whole simulation process has just to take less than 17 hours for a study case when conducting our research in a 16 Xeon cores IBM workstation. According to the velocity contours, it can be found that the human passengers flowing pattern should be characterized by its downwashes over the human heads and vortices dissipation in a descending scale behind the human body. In so doing, we have introduced the velocity flux through the gate-plane as the index to depict the temporal fluctuation of the wake-flow induced by the human-crossing. Then we have examined the cases with different walking paces and the initial distances for the sensitivity analysis. The curves are supposed to represent the same ＂bell＂ shape with different peak values and peak-time, which are supposed to be delayed for 0.95 s than the actual time the passenger was crossing the door-plane. In addition, the time of crossing the door-plane （ d/v ） are supposed to increase with T p （velocity flux peak-time）, which seems to be highly reliable of the linear correlation, while d/v should be exponential with the V max （velocity flux peak value）. What we mean by the contaminant dispersion contour actually stands for the vortices development accompanied with human-crossing. Then, we have examined the uniformity of the velocity flux in the waking direction so as to depict the spatial and temporal distribution of the contaminants for benchmark case. The uniformity vs time curve indicat
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第2期204-208,共5页
Journal of Safety and Environment
关键词
环境工程学
人员尾流
污染物扩散
防护工程口部
environmental engineering
wake-flow induced by human-walking
contaminant dispersion
gateway of civilprotection engineering
