中文摘要：

为进一步提高细水雾的抑爆灭火效能,在建立细水雾抑爆系统试验平台的基础上,选用MgCl2、FeCl2和NaHCO3这3种添加剂,研究细水雾对瓦斯爆炸火焰的抑制效果.结果表明：使用含添加剂细水雾后,体积分数为9.5％的瓦斯的爆炸传播速度从13.8 m/s至少降到2.75 m/s 水雾区火焰长度最多缩短了242 mm 含0.8％FeCl2的细水雾有效性系数为6,有效性最高 从火焰图片剖面像素分布可以看出,火焰的辐射体温度均出现了不同程度的降低.不同添加剂不同程度地提高了细水雾的灭火效能,对瓦斯体积分数接近化学当量比的火焰传播有明显抑制效果.

英文摘要：

The present paper is aimed to introduce our study of the inhibiting function or effectiveness of the water mist with additives to the gas explosion. As is known, in order to enhance the effectiveness of the inhibiting function of the water mist to the gas explosion, three kinds of additives（ MgCl2, FeCl2 and NaHCO3 ）were generally adopted. While preparing the above throe kinds of solution; we have also prepared a small-sized experimental platform to inhibit the flame spread in the gas explosives. In so doing, we have made a compara- tive study of the different inhibiting effects by using different additives at different concentrations, and even with no additives used to the flame of the gas explosion. The results of our investigative and comparative study indicate that： as the result of using additives, the propagation speed of the explosion flame produced by CH4 at its con- centration of 9.5% tends to drop from 13.8 m/s to at least 2.75 m/s, because the additives in the water can resolve anion and cation, which are able to take up H＋, O2-, and OH-, produced when the gas is exploded. It is also found that both 0.8 % FeCl2 and 2.5 % MgCl2 help to reduce the propagation speed to 0 m/s in the water mist zone. To be exact, water mist with additives can reduce the flame length from 625 mm to the minimum 383 mm, because insoluble substances would be produced in the product of FeCI2 and Mg-Cl2, which may react with some free radicals and therefore extinguish flames, on the condition that the radiator fails to impart energy to the unburned fuel. If the effectiveness coefficient can be used to repre- sent the effectiveness of additives, it can be inferred that the bigger the effectiveness coefficient is, the better the effectiveness will be. Thus, we have found through experiment and testing that the greatest effectiveness of the water mist is 0.8 % of FeC12, the next is followed by 2.5 % MgC12. The experimental pixel value can be taken as the ra- diation temperature of gas flame. Thus, it can be seen that the wat