气体爆炸火焰传播是一个流体传播、辐射发光、化学反应相互影响和耦合的复杂物理化学作用过程，相关的研究一直是燃烧和爆炸领域中最为基础且最重要的课题，其中气体爆炸自由基辐射和微观反应进程的研究，对致灾机理和防控技术的研究具有非常重要的理论意义。因此，从工业防灾减灾、燃烧爆炸安全角度出发，针对工业生产和日常生活中氢气/甲烷的共存性和易燃易爆性，本文以氢气/甲烷预混气体为研究对象，采用实验研究、理论分析和数值计算的手段。主要开展了四个方面的研究内容：首先，采用20 L水平密闭管道，结合压力传感器和高速摄像机，研究了不同当量比(0.8、1、1.2、1.4)和氢气体积分数(0、0.2、0.4、0.6、0.8、1 (×100/%))的氢气/甲烷爆炸压力特性和火焰传播特性，获得了氢气/甲烷爆炸火焰传播动力学特性和氢气/甲烷爆炸的压力与火焰传播的耦合关系；其次，结合瞬态光谱系统测试，研究了不同位置、不同特征波长的OH、CN、CH自由基辐射光谱特性，获得了氢气/甲烷爆炸自由基辐射光谱特性的位置分布关系。然后，基于化学动力学软件CHEMKIN，利用GRI-Mesh 3.0反应机理，在零维均质反应器内，模拟计算了氢气/甲烷爆炸过程OH、CN、CH等自由基的生成率和敏感性，获得影响自由基生成的主要基元反应。最后，研究了氢气/甲烷爆炸压力、火焰传播和自由基辐射关联，分析了爆炸压力、火焰传播和自由基辐射以及基元反应的耦合机制，建立了氢气/甲烷爆炸宏观特征-微观反应进程的关联。
通过火焰传播动力学的研究，表明氢气体积分数越大，对混合气体爆炸特征参数的影响越明显，且对较高当量比混合气体的影响更加明显。在氢气体积分数α>0.6之后，氢气开始对混合气体各项爆炸压力和火焰传播参数起到主导性的影响，主要体现在P_max、（dP/dt）_max和火焰传播速度等参数的突增现象，以及较低和较高当量比时火焰结构的巨大变化。震荡现象是流场对冲运动的重要诱因，对压力特征参数的影响较微弱。随着氢气体积分数增加，震荡现象持续时间减小，出现震荡现象所需的压力增加，在φ=1~1.2附近，爆炸压力震荡现象更加地明显。压力波对变形“郁金香”火焰前期发育过程的火焰传播过程有比较明显影响，而压力波对典型的“郁金香”火焰传播过程后期的压力演变影响剧烈。
通过自由基辐射光谱特性的研究，发现OH、CH 和CN的主要辐射特征波长分别为308.9 nm、314.5 nm和388.3 nm，在主要辐射特征波长处受氢气体积分数和当量比增加的影响程度最大。OH的最大辐射光谱强度高于CH和CN，氢气体积分数增加对OH的辐射光谱强度具有更强的影响。当量比为1和1.2时的各自由基最大辐射光谱强度整体均高于当量比为0.8和1.4时最大辐射光谱强度。较高和较低当量比情况下的自由基的辐射光谱强度受影响氢气体积分数和当量比增加更大。位置二位于管道中前段，其自由基辐射强度高于其他位置，而位置三和位置四的火焰辐射光谱强度大小对比关系会因实验的配比不同有所变化。
通过氢气/甲烷爆炸的自由基生成率和敏感性分析，表明控制各自由基生成率的主要基元反应种类不受氢气体积分数和当量比的变化的影响。氢气体积分数增加会改变控制各物质敏感性的主要基元反应种类，同时会使得各基元反应的敏感性降低，氢气逐渐占据反应主导地位。氢气/甲烷混合物中氢气优先于甲烷氧化，氢气体积分数增加使得甲烷氧化过程中产生H₂减少，促进了H₂的消耗。基元反应R38 O₂+H=O+OH是氢气体积分数增大到α=0.6以后体系内宏-微观特性得到提升明显的主要原因。氢气体积分数增加，促进基元反应R38大量进行，使得R38对整个反应的影响程度加大。基元反应R38会产生大量的H和OH，增大了CH₄、H₂、OH和CH的生成和消耗率。CN的生成率主要受甲烷浓度的影响，氢气体积分数对其影响较小，α≥0.6后生成率下降，主要是由于甲烷含量的减少所致。
通过关联性分析，可知变形的“郁金香”火焰自由基的辐射光谱强度主要来源于火焰前锋和余辉发射，而典型的“郁金香”火焰自由基的辐射光谱强度更多的是源于余辉发射。在爆炸压力上升阶段，震荡现象使得位置二爆炸压力下降时位置四处自由基辐射强度增加，位置四爆炸压力下降时使得位置二处自由基辐射强度增加。位置二处的火焰辐射光谱强度高于其他位置的火焰辐射光谱强度，在已燃区域形成的火焰流场对冲运动过程中的大量余辉发射是其主要原因。当量比变化时，最大爆炸压力和CH和CN的最大辐射光谱强度有更好的关联性，而氢气体积分数变化时，最大爆炸压力和OH的最大辐射光谱强度密切关联。

Flame propagation of gas explosion is a complex physicochemical process involving the coupling and interaction of fluid propagation, radioluminescence, and chemical reactions. Related research has always been the most basic and important topic in the field of combustion and explosion, among which the research on radical radiation and microscopic reaction process of gas explosion has very important theoretical significance for the research of disaster mechanism and prevention and control technology. Therefore, from the perspective of industrial disaster prevention and mitigation, combustion and explosion safety, in view of the coexistence and flammability of hydrogen/methane in industrial production and daily life, This paper takes the hydrogen/methane premixed gas as the research object, and adopts the means of experimental research, theoretical analysis and numerical calculation, and mainly carries out four research contents: Firstly, using a 20 L horizontal closed pipeline, combined with two pressure sensors and a high-speed camera, the hydrogen/methane explosion pressure characteristics and flame propagation characteristics of different equivalence ratios (0.8, 1, 1.2, 1.4) and hydrogen volume fractions {0, 0.2, 0.4, 0.6, 0.8, 1 (×100/%)} were studied, and the flame propagation dynamics and the coupling relationship between hydrogen/methane explosion pressure and flame propagation are obtained. Secondly, combined with the transient spectral system test, the radiation spectral characteristics of OH, CN and CH radicals at different positions and different characteristic wavelengths were studied, and the positional relationship of the radiation spectral characteristics of hydrogen/methane explosion radicals was obtained. Then, based on the chemical kinetics software CHEMKIN, using the GRI-Mesh 3.0 reaction mechanism, in a zero-dimensional homogeneous reactor, the rate of production and sensitivities analysis of free radicals such as OH, CN, and CH in the hydrogen/methane explosion process were simulated and calculated. The main elementary reactions affecting the generation of free radicals are obtained. Finally, the correlation of explosion pressure, flame propagation and radical radiation of hydrogen/methane mixtures was studied, and the coupling mechanism of explosion pressure, flame propagation, radical radiation and elementary reaction was analyzed, and The correlation between the macroscopic characteristics of hydrogen/methane explosion and the microscopic reaction process was established.
Through the study of flame propagation dynamics, it is shown that the larger the hydrogen volume fraction, the more obvious the influence on the characteristic parameters of the mixed gas explosion, and the effect on the explosion characteristic parameters of the mixed gas with higher equivalence ratio is more obvious. When the hydrogen volume fraction α>0.6, hydrogen begins to play a dominant role in the explosion pressure and flame propagation parameters of the gas mixtures, which is mainly reflected in the sudden increase of parameters such as P_max, (dP/dt)_max and flame propagation speed, and the dramatic change in flame structure at lower and higher equivalence ratios. Oscillation of explosion pressure is an important inducement for the hedging motion of the flow field, and has a weak influence on the pressure characteristic parameters. With the increase of the hydrogen volume fraction, the duration of the shock phenomenon decreases, and the pressure required to appear the shock phenomenon increases. The explosion pressure shock phenomenon is more obvious in the vicinity of φ=1~1.2. The pressure wave has a significant impact on the flame propagation process in the early stage of the deformed "tulip" flame development, while the pressure wave has a strong impact on the pressure evolution in the later stage of the typical "tulip" flame propagation process. 
Through the study of the spectral characteristics of radical radiation, it is found that the main radiation characteristic wavelengths of OH, CH and CN are at 308.9 nm, 314.5 nm and 388.3 nm, respectively, which are most affected by the increase of hydrogen volume fraction and equivalence ratio at the main radiation characteristic wavelengths. The maximum radiation spectral intensity of OH is higher than that of CH and CN. The increase of the hydrogen volume fraction has a stronger effect on the radiation spectral intensity of OH. When the equivalence ratios are 1 and 1.2, the maximum radiation spectral intensity of each radical is overall higher than that when the equivalence ratios are 0.8 and 1.4. The intensity of the flame radiation spectrum of radicals at higher and lower equivalence ratios are affected more by hydrogen volume fraction and equivalence ratios. Position (window) 2 is located in the middle and front section of the pipeline, while the intensity of the flame radiation spectrum at positions 3 and 4 will vary due to the different ratios of the experiments. 
Through the rate of production analysis and sensitivity analysis of free radical of hydrogen/methane mixtures explosion, it shows that the main elementary reaction species controlling the rate of production of each radical was not changed by the changes of hydrogen volume fraction and equivalence ratio. The increase of the hydrogen volume fraction will change the main elementary reaction types that control the sensitivity of each substance, and at the same time, the sensitivity of each elementary reaction will decrease, and hydrogen will gradually occupy the dominant position of the reaction. Hydrogen participates in the oxidation reaction preferentially over methane in the hydrogen/methane mixtures, and the increase in the volume fraction of hydrogen reduces the production of H₂ during the oxidation of methane and promotes the consumption of H₂. The elementary reaction R38 O₂+H=O+OH is the main reason for the obvious improvement of the macro-micro properties of the system after the hydrogen volume fraction increases to α=0.6. The increase of the hydrogen volume fraction promotes a large amount of elementary reaction R38, which increases the influence of R38 on the whole reaction. The elementary reaction R38 produces a large amount of H and OH, which increases the generation and consumption rates of CH4, H₂, OH and CH. The formation rate of CN is mainly affected by the methane concentration, the hydrogen volume fraction has little effect on it, and the generation rate decreases when α≥0.6, which is mainly caused by the decrease of methane content.
Through correlation analysis, it can be seen that the radiation spectral intensity of deformed "tulip" flame radicals mainly comes from the flame front and afterglow emission, while the radiation spectral intensity of typical "tulip" flame radicals is more from afterglow emission. The explosion pressure oscillation phenomenon makes the radiation intensity of the free radicals at the position 4 increase when the explosion pressure of the position 2 decreases, and when the explosion pressure of the position 4 decreases, the radiation intensity of the free radicals at the position 2 increases. The flame radiation spectral intensity at position 2 is higher than that at other positions, and the main reason is the large amount of afterglow emission during the hedging motion of the flame flow field formed in the burned area. When the equivalence ratio was changed, the maximum explosion pressure had a better correlation with the maximum radiation spectral intensity of CH and CN, while when the hydrogen volume fraction was changed, the maximum explosion pressure was closely related with the maximum radiation spectral intensity of OH.

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