火焰环可以看作是受限空间内与火球具有类似拓扑结构的预混火焰单元.通过数值方法研究窄通道内火焰环的轴对称二维定常解及其随通道高度变化时的响应,考察火焰环在径向和三维小扰动作用下的稳定性.与沿通道高度方向上采用线性近似假设得到的结果进行对比分析,验证了线性近似假设在定性上的合理性和有效性.同时,从定量角度上揭示了火焰环的真实三维结构及其在三维扰动作用下的稳定性,为未来研究和理解火焰环更复杂的三维动力学行为打下了良好基础.
Flame rings can be considered as premixed flame units with a topology structure similar to flame balls within confined spaces. Numerical methods were employed to investigate the axisymmetric two-dimensional steady-state solutions of flame rings in narrow channels and their response to changes in channel height. The stability of flame rings under radial and three-dimensional small perturbations was examined. Comparative analysis was conducted on the results obtained by using linear approximation assumptions along the channel height direction, and the qualitative reasonableness and effectiveness of the linear approximation assumptions were validated. Meanwhile, from a quantitative perspective, this study reveals the true three-dimensional structure of flame rings and their stability under three-dimensional perturbations, laying a solid foundation for researching and understanding the more complex three-dimensional dynamics of flame rings in the future.
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