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本文成功搭建了适用于中国科学院力学研究所国家微重力实验室(NMLC)落塔的高压对冲火焰实验系统,并首次开展了微重力条件下加压对冲火焰实验,测定了一定张力条件下甲烷/空气层流预混火焰的熄灭极限。实验结果表明,随着压力的增高,甲烷/空气混合气体的可燃极限呈先增后降的非单调变化趋势,峰值发生在0.4 MPa左右。浮力对加压下微弱火焰熄灭极限的影响明显,在常重力条件下,相同张力下的熄灭极限较微重力条件下的偏大,峰值出现的压力略低。微重力条件下的实验结果与使用CHEMKIN的数值模拟的结果相当一致。
In this paper, a high-pressure impulse flame experimental system suitable for the falling tower of the National Microclimatronic Laboratory (NMLC) at the Institute of Mechanics, Chinese Academy of Sciences was successfully established. For the first time, a pressurized hedge flame experiment was carried out under microgravity conditions. The methane / Laminar flow Premixed flame extinction limit. Experimental results show that the combustibility limit of methane / air mixture increases first and then decreases with the increase of pressure, and the peak value occurs at about 0.4 MPa. The effect of buoyancy on the extinction limit of weak flame under pressure is obvious. Under normal gravity conditions, the extinction limit under the same tension is larger than that under microgravity, and the pressure at peak is slightly lower. The experimental results under microgravity are quite consistent with the numerical simulations using CHEMKIN.