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为了理解高压下合成气纯氧预混湍流火焰中火焰与流动的耦合作用,利用OH-PLIF激光测量技术开展了高压条件下合成气纯氧预混湍流火焰结构研究,获得了高压下预混湍流火焰前锋面结构,得到了火焰前锋面尺度信息,包括火焰体积、火焰面密度和火焰前锋面尺度,并分析了预混湍流火焰前锋面与湍流尺度和层流火焰尺度的相互作用关系。研究结果表明:高压预混湍流火焰前锋面为褶皱火焰面结构,火焰面为小尺度的尖峰结构和大尺度的树干状结构互相叠加;合成气火焰前锋面结构比甲烷混合气火焰更加精细,尺度更小;合成气预混湍流火焰体积较小,放热区较小,在预混贫燃燃气轮机燃烧室中容易产生燃烧振荡;合成气和甲烷火焰在湍流燃烧速率上表现出不同的转折规律,这可以通过火焰前锋面尺度和火焰自身不稳定性尺度来解释;湍流流动对火焰前锋面的扰动受到火焰自身不稳定尺度的限制。
In order to understand the coupling of flame and flow in the pure oxygen pre-mixed turbulent flame at high pressure, OH-PLIF laser was used to study the structure of pure oxygen pre-mixed turbulent flame under high pressure. The premixed turbulent flow Flame front structure information was obtained, including the volume of the flame, the density of the flame surface and the size of the front face of the flame. The interaction between the front surface of the turbulent flame and the scale of the laminar flow flame was analyzed. The results show that the front surface of the high-pressure pre-mixed turbulent flame is a wrinkled flame surface structure, the small-scale spike structure on the flame surface and the large-scale trunk structure are superimposed on each other; the flame front structure of the syngas is finer than the methane mixture flame, The syngas pre-mixed turbulent flame volume is small and the exothermic zone is small, combustion oscillation easily occurs in the combustion chamber of the premixed lean-burn gas turbine. Syngas and methane flames show different transitional rules in turbulent combustion rate, This can be explained by the scale of the flame front and the instability of the flame itself; the turbulent flow disturbance on the flame front is limited by the instability scale of the flame itself.