大空间建筑有毒有害气体扩散的仿真模拟研究

Numerical simulation of toxic harmful gas diffusion in large space buildings

采用基于K-ε湍流模型的CFD方法,对氯气在公共大空间建筑内的扩散情况进行仿真分析。首先利用Gambit软件进行建模,而后输入到Fluent软件进行仿真模拟,得到氯气的扩散云图,并且通过分析比较不同空调工况下的模拟结果数据,发现氯气重气贴地扩散趋势明显。空调工作时,室内流场对其扩散影响显著,氯气扩散速度变快,范围变大,但浓度比空调不工作时相对较低。通过研究氯气的扩散规律和影响其扩散的因素,可以优化大空间建筑通风设计,为化学恐怖袭击的应急处置提供参考。

By the method of CFD based on K-ε turbulence model,the diffusion of chlorine in the large space of public buildings was simulated. First of all,the model was established with the software of Gambit and then input the software Fluent to get the stimulation of chlorine diffusion cloud. The analysis and comparison of simulation results in different air-condition showed that chlorine,as heavy gas,spreaded close to the ground obviously. When air conditioning was operating,the indoor flow field had a remarkable effect.It caused chlorine to diffuse faster and larger,but the concentration became lower. The study on diffusion rule of chlorine and influencing factors will provides us with important reference for optimizing ventilation design of large space public buildings and the emergency disposal of chemical terrorist attack.