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为实现空气/煤油燃气发生器的可靠点火和稳定燃烧,采用试验与数值仿真相结合的方法对V槽火焰稳定器应用于燃气发生器时阻塞比和安装位置的选取进行了研究。发现不同阻塞比的火焰稳定器安装于燃气发生器不同位置时局部油气比可以是富油或贫油,甚至出现火焰稳定器一侧为贫油,另一侧为富油的状态。从接近当量比侧向贫油侧的热量和质量传递可以使得贫油侧的火焰稳定性能提高。钝体稳定的空气/煤油部分预混火焰存在“熄火-再点火”过程,其熄火频率为30Hz,高于贫油预混火焰的10Hz。阻塞比约0.6的V槽火焰稳定性能较好,获得了空气/煤油燃气发生器采用钝体稳定火焰时稳定器安装的特征长度范围。
In order to realize the reliable ignition and steady combustion of the air / kerosene gas generator, the combination of test and numerical simulation was used to study the choke ratio and installation location of the V-tank flame stabilizer when applied to the gas generator. It was found that when the flame stabilizer with different blocking ratio is installed at different positions of the gas generator, the local gas-to-gas ratio can be rich or lean, or even the side of the flame stabilizer is lean and the other side is rich. Flame stability at the lean side can be increased from near-equivalent heat and mass transfer on the late lean side. Blunt-body stable air / kerosene part of the premixed flame there “flameout - re-ignition” process, the flameout frequency is 30Hz, higher than the lean premixed flame 10Hz. The stability of the V-groove flame with a blockage ratio of about 0.6 is better, and the characteristic length range of the stabilizer installed by the air / kerosene gas generator with a bluff body stabilizing flame is obtained.