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利用高速纹影法研究初始压力和当量比对氢一空层流预混火焰传播特性的影响规律.分析了火焰传播过程中火焰表面拉伸作用的变化趋势,探讨了火焰固有不稳定性的决定因素,研究了表面拉伸作用和固有不稳定性对传播速度的影响,求取了氢-空火焰传播过程中的加速指数.结果指明,表面拉伸作用随火焰的传播而衰减,火焰不稳定倾向相应增强;当火焰表面发展为完全胞状态时,火焰传播速度突然增加,并以自加速的现象持续.氢-空预混火焰的加速指数随燃空当量比减小而增大,随初始压力增大而增大.
The effects of initial pressure and equivalence ratio on propagation characteristics of premixed flame of hydrogen-air laminar flow were studied by using high-speed profiling method.The trend of flame surface tension during flame propagation was analyzed, and the determinants of inherent flame instability , The effects of surface tension and inherent instability on the propagation velocity were studied and the acceleration index in the process of hydrogen-air flame propagation was obtained. The results show that the surface tension decreases with the flame propagation and the flame instability The flame propagation velocity suddenly increases and the self-accelerating phenomenon persists.The acceleration exponent of the hydrogen-air premixed flame increases with the decrease of the combustion air-space equivalent ratio, and increases with the initial pressure Increase and increase.