风速梯度对海上可燃气云爆燃特性影响的数值模拟  

Numerical simulation of influence of wind velocity gradient on deflagration characteristics of offshore flammable gas cloud

作　　者：刘文鹏[1] 金良安[1] 高占胜[1] 苑志江[1] LIU Wenpeng;JIN Liang＇an;GAO Zhansheng;YUAN Zhijiang(Navigation Department,Dalian Naval Academy,Dalian Liaoning 116018,China)

机构地区：[1]海军大连舰艇学院航海系

出　　处：《中国安全科学学报》2018年第7期58-63,共6页China Safety Science Journal

基　　金：“十三五”国防预研项目(30203010303)

摘　　要：针对海底输气管道和燃气运输船舶发生泄漏形成可燃气云的问题,基于k-ε湍流模型,并利用涡耗散模型,数值模拟6种风速梯度（1-11 m/s）下海上可燃气云的形成和爆燃过程,研究风速梯度对气云爆燃压力和温度特性的具体影响。结果表明：随着风速梯度的增加,稳定气云面积减小,爆燃最大压力降低,下风向低空区域的最高温度略有下降,火焰逐渐远离高空区域,直至完全停留在低空区域;在低空区域,风速梯度为1 m/s时无法形成大面积气云和持续高温,为3-11 m/s时将形成长时间、大范围的高温区。For the problems of flammable gas cloud formed by leakage in submarine gas pipelines and combustible gas transportation ships,based on the k-epsilon turbulence model and the eddy-dissipation model,numerical simulations of the formation and deflagration process of offshore flammable gas cloud were carried out under six wind velocity gradients（1-11 m/s）,the specific influences of the wind velocity gradient on the deflagration pressure and temperature characteristics of gas cloud were studied. The results show that as the wind velocity gradient increases,the area of stable gas cloud decreases,the maximum pressure of deflagration decreases,the maximum temperature in the downwind low-altitude area decreases slightly,and the flame gradually moves away from the high-altitude area until completely stays in the low-altitude area,that in the low-altitude area,when the wind velocity gradient is 1 m/s,a large-area gas cloud and continuous high temperature cannot be formed,but when it is 3-11 m/s,a long-time and large-scale high temperature area will be formed easily.

关 键 词：海上可燃气云 爆燃压力 爆燃温度 涡耗散模型 数值模拟 风速梯度 

分 类 号：X932[环境科学与工程—安全科学]