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利用实验和数值模拟对微重力和常重力条件下高度为14mm和10mm的窄通道内热薄纸张表面火焰传播特性进行了研究。不同重力条件下窄通道内火焰传播速度随气流速度变化的规律符合得较好,说明地面窄通道实验能够模拟微重力条件下材料表面火焰传播的主要特征。地面窄通道中浮力流动速度的最大值约为5cm/s,与常规实验通道(高度较大)相比,窄通道内的浮力对流在很大程度上受到限制。对火焰传播过程中的热损失分析表明,固相表面热辐射和气相热辐射对火焰传播的影响与气流速度有关。
Experiments and numerical simulations were carried out to study the flame propagation characteristics of hot narrow thin paper sheets with height of 14mm and 10mm under microgravity and gravity conditions. Under different gravity conditions, the propagation velocity of flame in narrow channel agrees well with the change of gas velocity, which shows that the narrow channel experiment can simulate the main characteristics of flame propagation on the surface of materials under microgravity. The maximum buoyancy velocity in narrow aisles is about 5 cm / s, and the buoyancy convection in narrow aisles is limited to a great extent compared with the conventional experimental aisles (larger in height). The analysis of the heat loss in the process of flame propagation shows that the influence of solid surface heat radiation and gas phase heat radiation on flame propagation is related to the air velocity.