导　　师： 张延松

学科专业： H1901

授予学位： 硕士

作　　者： ;

机构地区： 煤炭科学研究总院

摘　　要： 应用实验研究、理论分析和数值仿真等方法研究了瓦斯浓度对瓦斯爆炸冲击波和火焰在管道中传播的影响。 应用直径为700mm的试验管道进行了不同浓度下瓦斯爆炸传播试验。分析试验数据认为:①浓度的改变对压力峰值的影响是比较大的,当测点距离一定时,压力峰值与浓度成二次函数关系。②瓦斯浓度对火焰传播速度有重要影响,当测点距离一定时,火焰传播速度的倒数与浓度成二次函数关系。③爆源附近火焰传播速度较小,上升到某一峰值后又衰减。 在瓦斯爆炸实验基础上从瓦斯爆炸火焰传播和冲击波传播两方面描述了矿井瓦斯爆炸传播过程,并阐述了瓦斯爆炸冲击波传播爆燃转爆轰原理;分析了瓦斯浓度对瓦斯爆炸传播的影响,认为当瓦斯浓度不同时,瓦斯—空气混合物处于不同的氧平衡状态,使化学反应进程发生变化,从而影响火焰温度、爆炸压力、压力上升速率等参数。 借助流场模拟平台,以瓦斯爆炸传播理论模型为基础,应用连续相计算方法进行了瓦斯爆炸传播模拟。通过仿真结果与实验结果的对比分析,认为:①爆源点的最大压力值并不是整个爆炸过程的最大值。②冲击波最大压力值在爆源点附近先降低,然后上升到某一峰值再逐渐衰减。③最大压力值在衰减过程中不是单调衰减,有起伏。④实验值与模拟值存在一定的差异,模拟值在大部分范围内要明显大于实验值,这可能与壁面条件设定有关。⑤在出口附近模拟值逐渐降低,这与实验值逐渐升高的趋势正好相反。 Influence laws which different gas concentration functing in gas explosion in piping have been studied by experiment research, theory analysis and numerical simulation. Gas explosion flame and shock wave propagation experiment under different concentration is carried on in the experiment piping of 700 millimeters diameter. And the analysis of the test data is as following:①Influence of concentration impacting on peak pressure is analyzed. And peak pressure has a cubic function with propagation distance with same test point distance.②Influence of concentration impacting on flame propagation velocity is analyzed. And flame propagation velocity reciprocal has a cubic function with propagation distance with same test point distance.③Flame propagation velocity is small in explosion source nearby, then rises to some peak value and weakens gradually. Based on the experimental data, the paper formulates the principle of promulgation deflagration in shock wave changing to detonation from gas explosion in the gas explosion flame propagation and shock wave. Influence of concentration impacting on peak pressure is analyzed. Under different gas concentration, the gas -air mixture is on the different oxygen balance condition, which causes the chemical reaction advancement changing, and flame temperature, explosion pressure, pressure rise rate and so on have been influenced also. Using flow simulation platform and on the base of gas explosion propagation theoretical model, the gas explosion propagation numerical simulation is carried on applying the continuous phase. Through analysis and comparison of simulation and experimental results, something is found.①Maximum pressure of explosion source is not the maximum pressure of whole process.②Shock wave maximum pressure value decreases in explosion source nearby, then rises to some peak value and weakens gradually.③Maximum pressure value decay process is not monotonous, and has fluctuations.④Some differences exist between experiment value and simulation value, and majority of simulation value is larger than experiment value, which is influenced by Wall surface condition hypothesis.⑤Simulation value reduces in exporting nearby. And the tendency is opposite to experiment one.

关 键 词： 瓦斯爆炸传播 瓦斯浓度 最大爆炸压力 火焰传播速度 影响研究

分 类 号： [TD]

领　　域： [矿业工程]