基于层次分析法的受限空间瓦斯爆炸数值模拟研究

Numerical Simulation Study of Confined Space Gas Explosion Based on Hierarchical Analysis

为寻求有效的瓦斯爆炸防治和安全评估手段,提出基于层次分析法的受限空间瓦斯爆炸数值模拟研究。构建瓦斯爆炸物理模型,在假设条件成立前提下,通过建立湍流模型、容积模型和燃烧模型描述瓦斯爆炸过程,并设定边界条件和初始条件。以此为基础,基于层次分析法确定高权重特征因子,采用FLACS软件分别对瓦斯爆炸过程中温度、压力和反应速率这3个主要特征因子进行数值模拟分析。模拟结果表明:瓦斯爆炸前火焰加速燃烧,温度升高,后期受壁面以及气流冲击燃烧速度减慢,温度下降;受限空间瓦斯爆炸的压力是1个瞬间值,流场内部质点压力相同;分叉管道会加速瓦斯爆炸反应速率,矿井设计中建议使用直管道。

In order to seek the effective gas explosion prevention and safety assessment means,the numerical simulation study of gas explosioen in confined space based on hierarchical analysis is proposed.Build the gas explosion physical model,describe the gas explosion process by establishing the turbulence model,the volume model,and the combustion model,and set the boundary conditions and the initial conditions.Based on this,the high-weight feature factors were determined based on the hierarchical analysis method,and the temperature,pressure and reaction rate were analyzed by FLACS software.The simulation results show that the flame accelerates,the temperature increases before the gas explosion,the temperature decreases and the pressure is the same as the internal mass pressure;the fork pipeline will accelerate the gas explosion reaction rate,and the direct pipe is recommended in the mine design.