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从原理上介绍了用于测定微重力环境中蜡烛火焰温度分布的 Wollaston棱镜差分干涉仪 ,并给出了从差分干涉图计算轴对称蜡烛火焰温度分布的数学过程。测量与计算结果表明 ,微重力环境下的蜡烛火焰温度低于烟粒子的最小生成温度。由于自然对流消失 ,化学反应放热效率受到组分扩散速率的控制 ,辐射热损失的冷却作用相对增强 ,这是引起微重力环境中蜡烛火焰温度降低的主要原因。结论部分地证实了微重力环境中蜡烛火焰出现暗蓝色无烟现象是由于火焰温度较低的推论
The Wollaston prism differential interferometer used to measure the temperature distribution of candle flame in microgravity environment is introduced in principle. The mathematical process of calculating the temperature distribution of axisymmetric candle flame from differential interferogram is given. Measurement and calculation results show that the flame temperature of the candle in the microgravity environment is lower than the minimum generation temperature of the smoke particles. Due to the disappearance of natural convection, the exothermic efficiency of chemical reaction is controlled by the diffusion rate of components, and the cooling effect of radiative heat loss is relatively enhanced, which is the main reason that causes the flame temperature of candle to drop in the micro-gravity environment. The conclusion partially confirms that the dark blue smokeless appearance of the candle flame in the microgravity environment is due to the corollary of a lower flame temperature