点火位置对裙板型蒸发式稳定器点火过程影响的数值研究

In order to enhance the ignition performance of the evaporative flameholder, reveal the inherent patterns of its ignition process, and provide a guidance for ignition location selection in engineering practice, the skirted evaporative flameholder under inflow conditions of 483 K temperature and Mach number 0.2 was investigated. Through large eddy simulation methodology, the ignition performance and ignition processes at different radial ignition locations were systematically examined, with particular emphasis on elucidating the influence of ignition location on flame development characteristics. The results demonstrated that the ignition location adjacent to the skirt plate (designated as R1) exhibited superior ignition characteristics attributable to wall-induced fuel enrichment effects. Computational simulations revealed a lean ignition limit fuel-air ratio of 0.000 7 at position R1, whereas positions R2 and R3 displayed significantly elevated values of 0.001 1. Notably, the lean ignition fuel-air ratio at positions R2 and R3 manifested a 57.1% enhancement relative to that observed at position R1, quantitatively confirming the spatial dependence of ignition performance in wall-bounded configurations. Although ignition processes at different locations exhibited similar developmental trends, variations in local flow field characteristics at the ignition sites induced distinct alterations in flame propagation paths. Comparative analysis revealed that the fuel concentration field exerted dominant influence on the ignition dynamics compared with aerodynamic factors.