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本文建立了包含辐射热损失的火焰沿热薄燃料表面传播的数学模型。燃毁点的密度作为待求参数出现在模型中。数值计算结果表明,在微重力环境中,火焰传播速度随空气流动速度的变化出现峰值。对比无辐射热损失模型和有辐射热损失模型的计算结果发现,辐射热损失是形成上述微重力燃烧特征的原因。在静止的微重力环境中或弱空气流动速度下,辐射热损失使燃毁点处有大量的残碳生成,但随着空气流动速度的增大,残碳生成量迅速减小。
In this paper, a mathematical model for the propagation of flame with radiant heat loss along the hot thin fuel surface has been established. The density of the burned-out point appears as a required parameter in the model. The numerical results show that in the microgravity environment, the flame propagation velocity peaks with the change of air velocity. Comparing the calculation results of the radiative heat loss model and the radiative heat loss model, it is found that the radiative heat loss is the reason for the formation of the above microgravity combustion characteristics. Under static micro-gravity environment or weak air flow rate, the radiative heat loss causes a large amount of residual carbon to form at the burnt-out point, but as the air flow rate increases, the residual carbon generation decreases rapidly.