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首页> 外文期刊>Annals of the New York Academy of Sciences >Canceling Buoyancy of Gaseous Fuel Flames in a Gravitational Environment Using an Ion-Driven Wind
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Canceling Buoyancy of Gaseous Fuel Flames in a Gravitational Environment Using an Ion-Driven Wind

机译:利用离子驱动风消除重力环境中气体燃料火焰的浮力

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摘要

Electric fields applied to combustion plasmas can be used to manipulate the thermofluid flow field to reduce buoyant forces and, hence, convection in locations near and within the flame. The resulting flow field is similar to that which is obtained in microgravity. Previous work has shown that buoyancy is modified in a non-premixed methane-air capillary flame when it burns in a capillary-to-plane configuration and an electric field is applied, and that regions of neutral or microbuoy-ancy exist, as indicated by the examined temperature and oxidizer profiles. The aim of this article is to examine in more detail this microbuoy-ancy condition and the coupling between the ion wind and resulting thermofluid flow field. To this end, the voltage-current characteristics (VCC) of CH_4, C_2H_2, C_2H_4, C_2H_6, and C_3H_8 are measured and compared. Soot generated in the C_2H_X and propane flames lead to a hysteresis in the VCC curve whereby increased sooting leads to lower ion currents at constant flow rates and applied potentials. Buoyancy regimes for these flames in this configuration are determined. Methane can achieve the highest flow rate without sooting at the microbuoyant condition, and does not exhibit hysteresis in the VCC for the flow rates examined here. Furthermore, in this geometry, the microbuoyant condition for methane is found to coincide with ion current saturation when the capillary-to-plane distance is varied. These results allow for several simplifications to be made when modeling the flame at these conditions: the imposition of a spherical flame boundary with known ion current, and negligible recombination in the domain.
机译:施加到燃烧等离子体上的电场可用于控制热流体流场,以减小浮力,从而减小火焰附近和火焰内的对流。所得的流场类似于在微重力下获得的流场。先前的工作表明,当非预混合甲烷-空气毛细管火焰以毛细管-平面构型燃烧并施加电场时,其浮力会发生变化,如中所示,存在中性或微浮力区域检查的温度和氧化剂曲线。本文的目的是更详细地研究这种微浮力条件以及离子风与产生的热流体流场之间的耦合。为此,测量并比较CH_4,C_2H_2,C_2H_4,C_2H_6和C_3H_8的电压-电流特性(VCC)。在C_2H_X和丙烷火焰中产生的烟灰会导致VCC曲线出现滞后现象,从而增加烟灰会导致在恒定流速和施加电势下离子电流降低。确定这些火焰在这种构造中的浮力状态。甲烷可以达到最高流速,而在微浮力条件下不会产生烟灰,并且在此处检查的流速下,VCC不会出现滞后现象。此外,在这种几何形状中,当毛细管到平面的距离发生变化时,甲烷的微浮力条件与离子电流饱和相一致。这些结果允许在以下条件下对火焰建模时进行一些简化:以已知离子电流强加球形火焰边界,并且在域中的重组可忽略不计。

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