不同物质组合摩擦火花引燃特性的研究

在本研究中,对碳钢、铍青铜和铜镍锰合金等三种金属与砂轮和45号钢轮摩擦时产生火花的能力和引燃能力作了对比实验。用于实验的可燃混合气为液化石油气/空气和氢/空气。实验表明,碳钢和砂轮摩擦产生的火花最强烈,但仍很难引燃液化石油气/空气混合气;铍青铜与砂轮摩擦时几乎看不到火花,铜镍锰合金在同样条件下产生火花的几率销大。在摩擦时间较长的条件下,两者均能引燃极易爆炸的氢/空气混合气,但爆炸却并不是在火花出现时立即发生的。可以推断:在上述条件下,摩擦造成的炽热表面是引燃的主要原因,而材料的引燃能力的强弱,不能只以是否产生火花为判断基准。

Study on the spark ignition characteristics of friction between different metal materials

In this paper, comparisons of spark ignition characteristics between different metal materials arc proposed. The mixed combustible fuel gases used in the experiments arc: liquefied petroleum gas/air and hydrogenn/air. The results show that the spark caused by. friction between carbon steel and grinding wheel is the most intensive, but ignition of liquefied petroleum gas/air fuel is still difficult. In the process of ffriction between beryllium bronze,and grinding wheel, there is no spark produced. And Cu-Ni-Mn alloy can produce more spark in the same experimental conditions. Giving a longer friction time, both the two experiments ignite the hydrogen/air fuel, but explosion take place short after. FFrom the experimental results, we can see that the hot surface caused by friction is the direct source o ignition and the ignition ability of metals are not fully rely on the spark caused by friction between different metal materials.