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中文核心期刊

微重力下薄燃料表面火焰传播的地面窄通道模拟

Simulation of flame spread over thin solid fuel under microgravity using narrow channel on ground

  • 摘要: 对微重力下薄燃料表面逆风火焰传播的地面窄通道模拟,进行了量纲分析,并通过火焰传播图像记录进行了实验验证. 结果表明,减小实验段特征尺寸可以实现微重力燃烧的地面模拟.在各种氧气浓度条件下,竖直和水平窄通道内的火焰传播速度随气流速度的变化趋势完全不同,而且,水平窄通道可以有效限制自然对流,而竖直窄通道较难. 当通道高度增大时,竖直和水平窄通道中,火焰传播速度和吹熄极限速度都不同程度地增大,这是热损失减小、火焰面遇见的气流速度减小以及自然对流速度增大3个因素的综合结果. 对于水平窄通道,1cm是一个可以定性模拟微重力下自然对流的尺寸. 对于竖直窄通道,则需要高度更小的窄通道来限制自然对流.

     

    Abstract: The simulation of flame spread over thin solid fuel undermicrogravity with narrow channel was analyzed with dimesion theory and validated experimentally by using flame spread picture recording. The resultshows that the qualitative simulation of microgravity combustion on groundcan be achieved with reducing the size of test section. The trends of theflame spread rate varying with flow velocity in vertical and horizontalnarrow channels are quite different. The natural convection in horizontalnarrow channel is effectively suppressed, while that in vertical channel isnot.

     

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