液化天然气泄漏扩散模型比较

重气扩散的SLAB、DEGADIS和Fluent模型被应用于LNG泄漏扩散实验的模拟过程中,以Coyote3和5为例,对各模型模拟的体积分数随时间的变化与实验值进行了对比,结果表明Fluent模拟的结果最为接近实验值,SLAB模拟结果次之,由于模拟假设风速和风向不变致使模拟结果没有实验结果所存在的频繁波动。文中最后对各模型的统计误差FB,MG,VG,MRSE,NMSE以及FAC2进行了计算,分析结果表明三类模型模拟的结果与实验值一致,但结果都偏高,相比较而言,Fluent的结果更准确。

Comparisons for LNG dispersion models

This paper deals with the simulation of atmospheric cloud dispersion resulting from liquefied gas spills. Experimental data were taken from the Coyote series trials that involved large scale cryogenic natural gas release. The data were used for checking the validity of the results obtained through three models including SLAB, DEGADIS, and Fluent. Taking Coyote3 and 5 as examples, the results showed that the Fluent cede approximated gas concentration histories with a reasonably better agreement and predicted more correctly the behavior of gas cloud during dispersion compared with the other two models. The statistical treatment including FB, MG, VG, MRSE, NMSE and FAC2 revealed that all three models got acceptable results but they all over predicted and the Fluent cede demonstrated considerably better accuracy.