火灾中摩擦火花和热表面引燃能力的研究(英文)

Ignition Capability of Friction Sparks and Hot Surface for Fire Risk

用摄影和热点偶等方法在一个有磨削轮的容器中研究了机械摩擦火花和热表面的引燃能力。在本研究中发现，对于某些材料，如碳钢等，由摩擦产生的磨屑可以被周围空气中的氧氧化而释放出大量的热，从而使屑粒温度升高，达到白热程度。通常我们把一簇这样的颗粒叫做“摩擦火花”。即使是不可氧化的摩擦材料，在摩擦中也可变热，但在可能形成热表面的同时，颗粒只能达到红热程度。研究表明，温度可能是决定引燃的最重要的因素。一般说来，火花的引燃能力要高于热表面。

A study on ignition of mechanical friction sparks and hot surfaces was carried out in an explosion vessel with a gringing wheel by using photograph and thermal couples. In this study, we found that for several kinds of material, such as steel, the particles that fell from the matrices due to the friction can be oxidized by oxygen in surrounding air and a lot of heat will be released. The heat makes the particles to be candescent with a very high temperature. Usually, we call a shower of such particles Friction Sparks. However, the material can be heated even it is not oxidizable, though the material may only become red hot while a hot surface may be formed. This study finds that the temperature may be the most important factor to determine the ignition. Usually, the ignition capability of sparks is higher than that of hot surfaces.