Abstract: Flame propagation of flameholder is very important for the estimation of combustion efficiency and combustor length. Based on experiments verification，effects of fuel injection position，fuel injection angle and fuel air ratio on the flame propagation of the cavity-based strut flameholder were analyzed by 3D numerical simulation，according to the temperature distribution and ions mole fraction distribution information downstream the flameholder. Under the condition that inlet temperature is 900℃，inlet Ma is 0.2，pilot fuel air ratio is 4×10-3 and mainstream fuel air ratio is 2.8×10-3～6.8×10-3，the results show that，the temperature and the ions mole fraction downstream the flameholder have similar distribution，and can be used to analyze the flame propagation simultaneously. It’s positive to flame propagation when the pilot fuel injection position is closed to the leading edge of flameholder. In the condition of fuel air ratio being 2.8×10-3，closer mainstream fuel injection position to the leading edge of flameholder or perpendicular injection angle to the main stream is more beneficial to the flame propagation. While with the increasing of fuel air ratio to 5×10-3～6.8×10-3，flame propagation ability increases when the mainstream fuel injection position is away from the leading edge of flameholder or the injection angle is parallel to main stream. In the same fuel injection angle condition，fuel injection position strongly impacts the flame propagation via changing of fuel air ratio. However，in the same fuel injection position，the influence of fuel air ratio on the flame propagation is relatively small with the change of injection angle.

Key words: Cavity-based strut flameholder；Flame propagation；Fuel injection；Numerical simulation

摘要： 火焰稳定器的火焰传播性能对燃烧效率与燃烧室长度预测非常重要。在实验验证的基础上，采用三维数值模拟的方法，基于凹腔支板稳定器下游的温度分布及离子浓度分布规律，研究了燃油喷射位置、喷射角度及油气比对凹腔支板稳定器火焰传播性能的影响。研究表明，在来流温度900℃、马赫数0.2、值班油气比4×10-3及主流油气比2.8×10-3～6.8×10-3条件下，支板稳定器下游离子浓度分布趋势与温度分布趋势几乎相同，可同时用来预测火焰传播性能；值班供油位置越靠近稳定器前缘越有利于增强火焰传播性能；当主流油气比为2.8×10-3时，主流喷油位置更靠近稳定器前缘或者采用侧喷方式更有利于火焰传播；随着主流油气比增大至5×10-3～6.8×10-3，主流喷油位置远离稳定器前缘及顺喷方式拥有更加良好的火焰传播性能；喷射角度相同时，喷油位置显著影响油气比对火焰传播性能的影响；喷油位置相同时，改变燃油喷射角度，油气比对火焰传播性能的影响相对较小。

关键词: 凹腔支板稳定器；火焰传播；燃油喷射；数值模拟