| Citation: | WANG Qijiao, ZHENG Weilin, WANG Jiao, et al. Numerical simulation of three-dimensional flame propagation characteristics and cellular instability of natural gas/air[J]. Journal of Aerospace Power, 2025, 40（10）：20230670 doi: 10.13224/j.cnki.jasp.20230670
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To systematically study the flame propagation characteristics and flame instability of natural gas/air premixed flames at different initial temperatures, initial pressures, and equivalence ratios, high-precision numerical simulations were carried out by using a 3D, transient large eddy simulation method with adaptive mesh refinement modeling. Firstly, simulation results at atmospheric temperature and pressure were validated. The simulated flame morphology was in good agreement with experimental data, and the simulated critical flame radius was also in good agreement with that obtained by theoretical prediction. Secondly, key parameters of natural gas/air flames under different initial conditions were analyzed, revealing the dominant mechanism by which initial conditions influenced the inherent instability of flames. Finally, perturbation analysis of the flame structure was conducted based on the Fast Fourier Transform of cross-sections, revealing the complex interaction between perturbations and stretch rates. The results indicated that different initial temperatures had little effect on the flame morphology, but as the initial pressure increased, the crack splitting on the flame front gradually intensified, and the number of cells on the flame surface increased. Increasing the initial pressure had a greater effect on the reduction of flame thickness, while the density ratios were not sensitive to changes of initial pressure. Therefore, the initial pressure had a more significant effect on the flame stability. The disturbance energy of the wave numbers ranging from 4 to 15 increased significantly with initial pressure, and the disturbances with smaller wavelengths developed consequently. By contrast, the initial temperature and equivalence ratio had little effect on the wave number range of disturbances.
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