压入式通风掘进面有害气体浓度扩散数值模拟

Numerical simulation of concentration diffusion of harmful gas in heading face with forced ventilation

采用大型有限元软件ADINA的CFD模块,对压入式通风条件下掘进隧道的有害气体浓度扩散进行了三维空间数值模拟,得到了隧道内的风流结构分布,即在工作面附近存在涡流,涡流中心有害气体浓度最高。结果表明,涡流对扩散有明显的滞留作用。与理论分析相结合,得到了有害气体浓度随通风时间的变化规律,为实现隧道掘进面有效通风提供了理论基础。

The diffusion of harmful gas is carried out by using numerical simulation of 3-D space under condition of forced ventilation,with the CFD module of ADINA,the software of large-scale finite elements.The flow framework of forced ventilation of tunnel has been obtained.Several vortexes are distributed nearby the heading face,which has great influence on diffusion of harmful gas.The concentration of harmful gas is highest in vortexes center,combining theoretical analysis,the variation discipline of the harmful gas is obtained with the ventilation time.This paper provides the criteria for effective ventilation in heading face of tunnel.