复杂气候条件下LNG扩散特性的数值模拟  

Diffusion characteristic of LNG plume in complex climate condition

作　　者：王海蓉[1] 

机构地区：[1]中山大学工学院安全工程研究中心,广州510006

出　　处：《低温工程》2008年第4期10-14,共5页Cryogenics

基　　金：国家自然科学基金(50474034)项目;中澳天然气合作伙伴基金项目资助

摘　　要：结合随机游走模型与拉格朗日粒子模型(LPDM),计算了湍流输送程度的表征量:平均水平输送速度,水平与垂向速度场以及水平与垂向的脉动速度。计算结果与风洞试验数据的对比显示:水平脉动速度小于实验值。近地层的垂向脉动速度计算值小于实测值,超过600 m高度后,垂向脉动速度计算值大于实测值。在速度场模拟的基础上,进一步计算了下风向的地面浓度、水平方向的羽流扩散宽度和垂直方向的羽流扩散宽度等扩散参数,并讨论了经验公式与模拟结果的差异。Combining the Random Walk and Lagrangian particle dispersion model（LPDM） ,the characteristic parameters of turbulent delivering intensity, including average horizontal delivering velocity, average and vertical fluctuation velocity were calculated. The calculation results contrasted to wind tunnel experiment results show that the horizontal fluctuation velocity is less than that of experiment and the vertical fluctuation velocity calculated is less than that of test in surface atmosphere layer. When the height is over 600 m, vertical fluctuant velocity calculated is greater than experiment data. Based on simulation of the velocity field, the total distribution of concentration and diffusion parameter, including diffusion width in both average and vertical direction was calculated fatherly. Finally, the difference between simulation result and experience formula was discussed.

关 键 词：LNG 扩散 速度 浓度 扩散幅度 

分 类 号：TB663[一般工业技术—制冷工程]