重气瞬时扩散数值模拟的实验验证及应用研究

运用计算流体力学方法对重气瞬时扩散现象进行数值模拟,并与重气扩散理论及野外现场实验观测结果进行定性和定量对比分析. 结果表明,数值模拟方法可以再现重气瞬时扩散的物理过程并以较高的可靠性预测浓度场的时空分布特征. 将数值模拟结果应用于实际的风险分析和安全评价中,可以定量地预测特定地点危险浓度的到达时间、持续时间以及特定时间危险浓度的空间分布;得出了在重气毒性阈值较低的情况下,近源区和远源区中毒风险一样高等结论.

A Study on the Validation and Application of Numerical Simulation for the Instantaneous Dispersion of Heavy Gas

Numerical simulation was implemented to study the phenomenon of instantaneous release of heavy gas using computational fluid dynamic method so as to do research on the distribution of concentration of heavy gas and on how to apply the distribution characteristic to industrial safety. Numerical simulation method could not only simulate the physical process of heavy gas release but also predict the distribution of concentration both at space and time with high reliability, results of simulation were compared with both theories of heavy gas dispersion and with observation results from large-scale field tests. Results of simulation can quantitatively predict the accurate time when dangerous concentration is reached and predict how long it will stay in certain sites, for specific time, space distribution of dangerous concentration can be provided. Risk of poisoning in near-source zones and far-source zones can be equally provided that toxic threshold is low enough.