水电站不同火源强度烟气运动模拟  

Smoke movement simulation of hydropower station fire with different fire intensity

作　　者：申健[1] 李安桂[1] 马江燕[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《消防科学与技术》2011年第12期1116-1120,共5页Fire Science and Technology

基　　金：陕西省"13115"科技创新工程重大科技专项(2009ZDKG-47);陕西省教育厅专项(11JK0948);西安市城乡建设科技项目;西安建筑科技大学青年基金(QN0915)

摘　　要：应用FDS模拟水电站地下主厂房火灾烟气填充与流动动态过程,分析不同火源强度下烟气分层规律。重点分析火源强度为10MW时的烟气填充过程、顶棚射流温度和横向烟气温度的变化特点。结果表明,烟气到达某一高度的时间随火源强度的变化服从一阶指数衰减;顶棚射流温度和烟气层横向温度变化具有很强的规律性;下层空气温度不高但浓度相对较高;同一水平面的烟气浓度分布很不均匀,距火源30m以外处的浓度是距火源中心10m以内处浓度的2～3倍。FDS simulation method was applied to study the smoke filling process and flow dynamics in underground main powerhouse of hydropower station, to obtain the rule of smoke layering. The characteristics of smoke filling process, ceiling jet temperature, and horizontal smoke temperature when the fire intensity is 10 MW was focused on. Result showed that, the required time for smoke to reach a certain height changes with fire intensity according to first-order exponential decay; the ceiling jet temperature and smoke layer horizontal temperature change with strong regularity; air lower is not with high temperature, but concentrated; the distribution of smoke concentration is not uniform on the same horizontal plan, and the smoke concentration more than 30 m away from the fire is 2-3 times as much as that less than 10 m away.

关 键 词：水电站 封闭空间 大涡模拟 烟气浓度 

分 类 号：X913.4[环境科学与工程—安全科学] TU271.1[建筑科学—建筑设计及理论]