矿井甲烷、煤尘及其混合物爆炸已成为当前是煤矿安全生产的重大灾害之一。一旦
发生甲烷、煤尘爆炸事故，会造成极大的伤亡及财产损失，并严重影响煤矿的安全生产。
因此开展甲烷、煤尘及其混合物爆炸的相关研究对于甲烷煤尘诱发的爆炸事故防控及灾
害评估具有重要意义。
当前研究主要集中在爆炸机理、爆炸特征参数、爆炸传播特征、爆炸抑制及爆炸残
留物等方面，而涉及甲烷煤尘混合物爆炸火焰及燃爆特征的研究较少，特别是爆炸过程
中火焰动力学行为、中间产物辐射特征与爆炸压力发展过程的耦合机理尚未涉及。基于
此，本文将采用实验测试、理论分析和数值模拟相结合的方法，对甲烷-空气气氛下煤
尘云爆炸火焰动力学行为、初燃火焰的形态特征及动力学参数、爆炸全过程的压力变化
及中间产物特征波长辐射强度的变化规律等方面开展研究。主要研究成果如下：
构建了定容条件下甲烷－煤尘预混燃爆光谱、火焰、压力的同步测试系统，提出了
球形容器内爆炸火焰形态的表征参数及处理方法，开发了球形容器内爆炸火焰传播参数
分析软件；通过多组甲烷-煤尘爆炸重复性实验测试，验证了爆炸试验系统的稳定性，
分析了火焰传播参数分析软件的可靠性。
开展了甲烷-空气气氛下煤尘云爆炸初燃火焰-压力演化特征实验，对比分析了甲烷-空气加入煤尘前后的混合物整个燃爆过程中火焰的形成与发展过程。揭示了初燃火焰横纵半径及横纵火焰速度的发展特征及变化规律，发现初燃火焰横、纵向半径呈现Logistic 函数变化或者指数变化特征，横、纵向火焰速度呈现“迅速增加—峰值—缓慢减小”的变化趋势；研究了甲烷当量比、煤尘浓度及煤尘种类对混合物爆炸初燃火焰形态参数及动力学参数的影响，表明甲烷当量、煤尘浓度及煤尘种类比对甲烷-煤尘混合物爆炸初燃火焰横、纵向半径及火焰速度变化影响较大，随着初燃过程发展，不同工况下的横、纵向火焰拉伸率均呈现先增加后减小的趋势。随着甲烷当量比增加，马克斯坦长度bL 逐渐增大；随着煤尘浓度及变质程度的增加，马克斯坦长度bL 呈现振荡特征；提出了爆炸增压指数、燃爆指数、扩爆指数概念，探讨了甲烷当量比、煤尘浓度及煤尘种类对混合物爆炸特征参数的影响规律；归纳了混合物燃爆过程中火焰形态的六种演化
模式，揭示了爆炸压力与火焰形态演化的相互作用机制。
获取了甲烷-空气气氛下煤尘云爆炸火焰的光谱辐射特征及规律，得到了爆炸过程
中四种中间产物·OH*（λ=306.36 nm）、·CHO*（λ=318.6 nm）、·CH*（λ=431.4 nm）、·CH 2 O*
（λ=466.4 nm）的光谱辐射特性，分析了甲烷当量比、煤尘浓度及煤尘种类对各中间产
物的光谱特征参数的影响规律。表明甲烷当量比、煤尘浓度及煤尘种类对各中间产物的
光谱特征maxI 、0 , It 、dur It,、Iv 的变化趋势的影响呈现复杂的非线性特征，对四种中间产物的I? 、t? 、v? 影响均呈现非线性变化特征。煤尘颗粒的加入对混合物的基元反应特征强度、持续时间及反应速率产生先促进后阻尼的作用，这 3 个因素对中间产物max
I 的影响变化趋势与maxP 的一致，体系 ? ? max dt dP 与中间产物 ? ? max dt dI 之间随甲烷当量比、煤尘浓度、煤尘种类的变化呈现较为一致的趋势，爆炸超压峰值时间与中间产物光谱强度峰值时间先减小后增大，与maxP 、 ? ? max dt dP 、maxI 、 ? ? max dt dI 的变化规律相反。揭示了甲烷-空气气氛下煤尘云燃爆过程中爆炸压力与中间产物耦合影响机制，可将混合物的燃爆过程看作为“热－链”式反应过程。构建了 20-L 爆炸球内甲烷煤尘预混燃爆数值模型，开发了基于 FLUENT/MATLAB协同控制的甲烷-煤尘预混及爆炸仿真平台。模拟分析了爆炸球内甲烷、煤尘混合物的预混分散过程，表明预混流动过程存在喷粉阶段、分散阶段、稳定阶段及沉降阶段，发现了湍流扰动及颗粒表面近程力诱导的煤尘云团聚现象；分析了爆炸过程中波系结构的演化过程及分布特征，得到了爆炸过程中流场发展过程及演化特征。揭示了煤尘云在爆炸过程中瞬态运动特征，表明颗粒云团经历了分散、团聚、沉降、扬起及旋转等过程。
研究了甲烷当量比、煤尘浓度及煤尘种类对爆炸火焰传播特征的影响，发现甲烷当量比、
煤尘浓度、煤尘种类对火焰形态、火焰峰值温度、高温颗粒分布区域及未燃颗粒量的影
响特征。以上研究成果对于矿井甲烷煤尘爆炸事故灾害防控及灾害评估具有重要的科学价
值和实际意义。

Explosions of methane, coal dust, and their mixture have become one of the major
thermal disasters during the manufacturing process of coal mine. Once an explosion accident occurs, it will certainly result into enormous casualties and property losses, which would seriously affect the safety of coal mine production. Therefore, the research on the characteristics and propagation process for explosions of methane, coal dust and their mixture are of great significance for the prevention and control of explosion accidents induced by methane and coal dust in the underground coal mine.
Current investigations on the explosion of methane, coal dust, and their mixture mainly
focuses on the explosion mechanism, explosion characteristic parameters, explosion
propagation behaviors, explosion suppression and explosion residues, whereas few work has been reported on the coupling mechanism of flame shape, combustion rate, intermediate product radiation characteristics and explosion pressure development process in the explosion process. Taking the defects of those two aspects into consideration, in this work, experiment observation, theoretical analysis, numerical simulation, and the combination of those three methods were employed to conduct a comprehensive research into the flame dynamic behavior, the morphological characteristics and dynamic parameters of the initial flame, pressure evolution, and the variation law of the radiant intensity for the characteristic wavelength of the intermediate products. The main work of this thesis are as follows: The simultaneous measurement system which integrated by spectrum, flame, and pressure and sampling and test system for gaseous-solid product of methane-coal dust explosion under constant volume were constructed. Moreover, we proposed the characteristicparameters and processing methods of the explosion flame morphology in the spherical
chamber, then a processing system for extracting flame parameters in the spherical chamber was developed. The stability of the explosion system was verified through multiple sets of methane-coal dust explosions, and the reliability of the explosion flame propagation parameter analysis system was tested.
Experiments on the evolution characteristics of flame-pressure for coal dust cloud
explosion in methane-air atmosphere were carried out. The formation and development of flame with and without coal dust explosion in methane-air are analyzed. Furthermore, the development characteristics and variation rules of radius and velocity for the initial flame in the transverse and longitudinal directions are revealed. It is found that the radius in the horizontal and vertical directions of the initial flame present the characteristics of logistic function or exponential evolution. The influence of methane concentration, coal type, and coal dust concentration on the morphological parameters and kinetic parameters of the initial flame, results indicated that the influence of the methane equivalence, coal dust concentrations, and coal type on the flame radius is greater than that on the flame velocity, as the combustion process develops in the early stage, stretching rate of flame in the horizontal and vertical
directions under different working conditions showed a trend of increase first and then
decrease. With the increase of methane equivalent ratio, the markstein length increases
gradually. With the increase in coal dust concentration and metamorphic degree, the markstein
length shows the oscillation characteristic. The concepts of explosive charging index,
combustion-explosion index, and explosion-expansion index were put forward. The six
evolution modes of flame morphology in the process of mixture ignition and explosion wereanalyzed and the interaction mechanism between explosion pressure and flame morphologyevolution was revealed.
Experimental investigations on spectral radiation characteristic of the flame for coal dustcloud explosion in methane-air atmosphere were carried out, and spectral radiation
characteristics of the four intermediate products OH* (λ=306.36 nm), ·CHO* (λ=318.6
nm), ·CH* (λ=431.4 nm), ·CH 2 O* (λ=466.4 nm) during the explosion process were studied,moreover, the influence law of the methane equivalence ratio, coal dust concentration, and coal dust type on the spectral characteristic parameters of each intermediate product wereanalyzed systematically. Results showed that the effects of methane equivalence ratio, coal
dust concentration, and coal dust type on the spectral characteristics
maxI ,0 , It ,dur It,, andIvof each intermediate product have a complicated nonlinear characteristic, and the influence onthe four intermediate products has a nonlinear characteristic. The addition of coal dustparticles has the effect of accelerating and then damping the characteristic intensity, duration,and reaction rate of the elementary reaction of the mixture. The impact of those three factors on the max I of intermediate product is consistent with the trend of maxP . The variation trend
of ? ? max dt dP with change in equivalence ratio, coal dust concentration, and coal dust types showed a relatively consistent tendency with that of ? ? max dt dI . The peak time of the explosion overpressure and the intermediate product spectral intensity showed a first decrease and then increased, in contrary to the change rule of
maxP , ? ? max dt dP , and ? ? max dt dI . The
mechanism for coupling effect between explosion pressure and intermediate products during the explosion of coal dust cloud in CH 4 -Air atmosphere was revealed. The combustion explosion process of the mixture can be regarded as a “thermal-chain” reaction process.
A three-dimensional numerical model for describing the deflagration of methane-coal
dust under a constant volume was constructed based on the standard 20-L spherical chamber, moreover, a collaborative-control numerical simulation platform for calculating the premix and explosion of methane-coal dust mixture based on the embedded-based FLUENT/MATLAB, finally, the effectiveness of collaborative computing has been verified
through a case calculation. The premix and dispersion process of methane-coal dust mixture in the sphere was revealed through numerical calculation, which shows that the premixed flow process including the fast injection stage, the dispersion stage, the stable stage and the sedimentation stage. Turbulence disturbance and particle surface near-range forces are the main powder for turbulence agglomeration. Moreover, the evolution and distribution
characteristics of the wave structure during the explosion are analyzed, and the development and evolution properties of the flow field during the explosion are revealed. The transient movement characteristics of coal dust cloud during the explosion process was analyzed, results showed that coal particle cloud underwent the processes of dispersion, reunion,settlement, lifting and rotation. The effects of methane concentration, coal dust concentration,and coal dust type on the flame propagation characteristics were studied, and results showedthat the methane content, coal dust concentration, and coal dust type had a great influence onthe flame shape, flame temperature, distribution area of high-temperature particles, and thereexists a difference in the amount of unburned particles.The above-mentioned studies have posed important scientific value and practicalsignificance for disaster prevention-control and hazard assessment of methane-coal dust explosion accidents in coal mine.