摘要:
为探究U型通风采煤工作面瓦斯爆炸传播规律并探讨不同影响因素对瓦斯爆炸超压衰减的敏感性，利用Fluent模拟软件并结合某矿3906工作面情况开展了数值模拟研究。为了验证数学模型可靠性首先将模拟与实验数据对比，经对比得到两者误差均小于15%；其次依序进行模拟关键参数的优化并得到网格尺寸、迭代步长及点火温度最合理关键参数分别为0.2m、0.05ms及1900K，通过拟合得到工作面爆炸超压峰值及其到达时间与爆炸点距离之间的函数关系。采用极差分析得到三个主控因素极差值从大到小依次排列为：温度?瓦斯浓度?瓦斯积聚区压力，此次模拟中温度对于爆炸超压衰减影响最大，其中R值达到5.928；运用方差分析法对影响瓦斯爆炸超压衰减率主控因素进行显著性研究，三个主控因素极差值从大到小依次排列为：温度?瓦斯积聚区压力?瓦斯浓度，其中温度显著性达到31.835，其余两项不显著。
Abstract:
In order to investigate the propagation law of gas explosion in U-ventilated coal mining face and explore the sensitivity of different influencing factors to the overpressure attenuation of gas explosion, numerical simulation was carried out by using Fluent simulation software and combining with the situation of 3906 working face in a mine. By comparing the numerical simulation results with experimental results, and the relative error is less than 15%, which further verifies the reliability of the mathematical model in this paper. Additionally, the key parameters of grid size, iteration time step, and ignition temperature are optimized to 0.2m, 0.05ms, and 1900K, respectively. And the relationship between the peak of the explosion overpressure and the distance of the explosion point of the coal face is exponential, and the explosion overpressure and the distance of the explosion point meets the exponential function relationship. The relationship between the peak explosion overpressure and the distance to the explosion point is in line with the exponential function, and the relationship between the arrival time of the peak explosion overpressure and the distance to the explosion point is in line with the linear function. By designing an orthogonal array, 16 sets of data were obtained through simulation, and the following analyses were conducted based on this data. Using extreme difference analysis to get three main control factors extreme difference value from big to small in order: temperature ? gas concentration ? gas accumulation area pressure, the simulation of the temperature for the explosion overpressure attenuation of the greatest impact, in which the R-value reaches 5.928. ANOVA analysis was applied to study the significance of the main control factors affecting the attenuation rate of explosion overpressure. The range values for the three main control factors is ranked from largest to smallest as follows: temperature ? gas accumulation zone pressure ? gas concentration, with temperature showing a significance level of 31.835, while the other two factors were not significant.
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