压力波对受限空间内预混火焰动力学过程有重要的影响，研究氢/空气预混火焰与压力波的相互作用对燃烧科学的自身发展和氢能源的安全利用均具有重要意义。本项目拟采用实验测量、理论分析和计算流体动力学（CFD）模拟，系统地研究不同关键参数条件（当量比、几何尺寸、阻塞率等）下受限空间内氢/空气预混火焰与压力波相互作用的动力学规律与机制；揭示压力波作用下火焰传播和突变的动力学机理; 通过分析火焰微观结构、形状、速度、压力等特征参数与压力波特性之间的相互关系，建立压力波作用下的氢/空气预混火焰加速传播和突变的临界判据与理论模型；阐明压力波驱动的氢/空气预混火焰瑞利-泰勒（R-T）不稳定性的色散关系、增长速率等特性，建立其与火焰速度之间的定量关系；发展氢/空气预混火焰R-T不稳定性理论模型；将R-T不稳定性扰动效应与CFD燃烧模型耦合，完善氢/空气预混火焰传播的数值模型与方法，为氢能源安全利用提供理论支撑。

Pressure wave has an important influence on the premixed flame dynamics in confined spaces. Understanding of the interaction of premixed hydrogen/air flame with pressure wave is of great significance for both the development of combustion science and the safety of hydrogen as energy carrier. This project aims to investigate the characteristics and underlying mechanisms of the interaction between premixed hydrogen/air flame and pressure waves in confined spaces using experimental methods, theoretical analysis and computational fluid dynamic (CFD) technique. The study will be performed by regularly varying the key parameters/conditions, such as equivalence ratio, geometry and blockage ratio. The relations between the pressure wave and the characteristic flame parameters, including the flame micro-structure, shape, propagation speed and pressure rise, will be analyzed in detail. The dynamics mechanisms of the flame propagation and sudden changes under the influences of pressure wave will be then revealed. Subsequently, the critical criteria and analytical model of the premixed hydrogen/air flame acceleration and its sudden changes can be developed. Furthermore, the characteristic features (e.g. the dispersion relation and growth rate) of Rayleigh-Taylor (R-T) instability of premixed hydrogen/air flame, which is driven by pressure wave, will be scrutinized. And the quantitative relationship between the R-T instability and flame speed will be elucidated. Based on this, a theoretical model of the R-T instability of premixed hydrogen/air flame can be achieved. Finally, the effects of the R-T instability will be coupled with CFD flame model, improving the current numerical approaches of premixed hydrogen/air flame dynamics. The research of the project can provide theoretical and technical supports for hydrogen safety and its applications as an energy carrier.