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首页> 外文期刊>Combustion Science and Technology >SHAPES OF SOOT PARTICLES, BOTH CHARGED AND UNCHARGED, AFTER MOLECULAR BEAM SAMPLING A PREMIXED OXYACETYLENE FLAME, BURNING AT ATMOSPHERIC PRESSURE
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SHAPES OF SOOT PARTICLES, BOTH CHARGED AND UNCHARGED, AFTER MOLECULAR BEAM SAMPLING A PREMIXED OXYACETYLENE FLAME, BURNING AT ATMOSPHERIC PRESSURE

机译：分子束采样预混合的乙氧基火焰后，在大气压下燃烧后，带电和不带电的烟尘颗粒形状

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Three types of soot particle (positively charged, negatively charged, and uncharged) have been collected simultaneously using molecular beam sampling from different points along the axis of a weakly sooting, premixed flame of C_2H_2 + O_2 + Ar, burning at atmospheric pressure and with a final temperature of ~2300 K. Particles were examined using transmission electron microscopy (TEM). Most of them had expected shapes, but some had quite unusual configurations and were surprisingly large (1-2 pm); these bigger particles often had amorphous, liquid-like structures, although some had crystalline exteriors. There was no significant difference in size or morphology between uncharged particles and those charged either positively or negatively. Also, it was clear that the concentration of neutral soot particles always exceeded that of the positively charged ones, which in turn were more abundant than those with negative charges. Some surprisingly large particles of soot were found leaving the flame's reaction zone; these were ascribed to this premixed flame having an exaggerated pyrolysis zone just before its reaction zone. Some particles grew to ~2un after a further residence time of 2 ms in the visibly sooting region. No evidence was found for molecular beam sampling falsifying these TEM images of young soot particles. However, it does appear that during the supersonic expansion, immediately after the flame was sampled, soot particles reached a terminal velocity, which was less than the final velocity of the gas molecules leaving the expansion.
机译：使用分子束采样同时从C_2H_2 + O_2 + Ar的弱烟灰预混合火焰的轴上的不同点使用分子束采样同时收集了三种类型的烟灰颗粒（带正电，带负电和不带电），在大气压下燃烧并在最终温度约为2300K。使用透射电子显微镜（TEM）检查颗粒。它们中的大多数具有预期的形状，但是有些具有非常不寻常的构造，并且大得令人惊讶（1-2 pm）。这些较大的颗粒通常具有无定形的液体状结构，尽管有些具有结晶外观。不带电粒子与带正电或带负电的粒子在大小或形态上无显着差异。同样，很明显，中性烟灰颗粒的浓度始终超过带正电的颗粒，而带正电的颗粒则比带负电的颗粒更丰富。发现一些令人惊讶的大烟灰颗粒离开火焰的反应区。这些归因于该预混火焰在其反应区之前具有夸张的热解区。在可见烟尘区域再停留2 ms后，一些颗粒长到〜2un。没有发现分子束取样伪造这些年轻烟尘颗粒的TEM图像的证据。但是，似乎确实在超音速膨胀期间，在火焰采样之后，烟尘颗粒立即达到最终速度，该速度小于离开膨胀的气体分子的最终速度。

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