直角拐弯巷道中瓦斯突出冲击气流传播特征研究  

Study of the shock wave propagation and gas flow during a coal and gas outburst at the roadway with a right-angled bend

作　　者：王凯[1] 周爱桃[1] 张建方 张品[1] 李川[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院煤炭资源与安全开采国家重点实验室,北京100083 [2]液化空气(杭州)有限公司,浙江杭州310011

出　　处：《中国矿业大学学报》2011年第6期858-862,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50874111;51174212);教育部新世纪优秀人才支持计划项目(NCET-10-0724);教育部留学回国人员科研启动基金项目;国家高技术研究发展计划(863)重点项目(2009AA063201);中央高校基本科研业务费专项资金项目(2010QZ05)

摘　　要：为研究突出冲击气流的传播过程及其特征,以直角拐弯巷道为例,建立了数值计算模型,对突出冲击气流的传播过程和瓦斯气体的输运过程进行了数值模拟,分析了突出冲击气流的传播衰减特征和突出瓦斯气体的输运特征.结果表明:突出能形成高速运动的冲击气流及冲击波,且突出冲击波传播速度能够超过当地音速;突出冲击气流在通过拐弯巷道时,会发生绕射及反射,其强度可能大于拐角前的强度,而在通过拐角之后衰减幅度较大;突出能在巷道内形成高浓度瓦斯区域,且瓦斯对流传质速度小于冲击气流运动速度.通过模型试验研究,初步验证了数值模拟的结论.A right angled roadway model was used for experimental and numerical studies of shock wave propagation and gas flow during a coal and gas outburst.The propagation and attenuation of the shock wave and gas flow from the outburst were numerically simulated.Gas transport and gas concentrations are predicted from the simulations.A high speed shock wave and gas flow form during the outburst.The propagation velocity of the wave can exceed the local speed of sound.The wave is diffracted and reflected at the bend in the roadway.The wave intensity can increase at the bend.It then decreases rapidly as the shock wave passes around the bend.High gas concentrations form because of the outburst but the mass transfer rate is slower that the velocity of the shock wave.Experimental studies have shown a preliminary validation of the numerical simulations.

关 键 词：煤与瓦斯突出 冲击气流 传播特征 

分 类 号：TD713[矿业工程—矿井通风与安全]