初始瓦斯浓度对爆炸温度影响实验研究

Experimental research on influence of initial gas concentration on explosion temperature

为探索瓦斯爆炸过程中温度变化规律,基于球形爆炸实验,研究不同初始瓦斯浓度条件下爆炸温度及爆炸温度与爆炸压力之间的相互作用关系。结果表明:随初始瓦斯浓度升高,在6.5%(低浓度)、9.5%(当量浓度)、12%(高浓度)时出现爆炸温度极大值,分别为995,932,1153 K;爆炸过程中温度延迟时间及升温时间与初始瓦斯浓度曲线均呈U型变化,当初始瓦斯浓度约为9.5%(当量浓度)时,温度延迟时间及升温时间变化较小;当初始瓦斯浓度在爆炸上限浓度(16%)和下限浓度(5%)附近时,受瓦斯浓度影响变化较大;初始瓦斯浓度在9.5%时,瓦斯爆炸过程中的压力波促进火焰燃烧波的反向传播,出现二次升温现象。研究结果可为完善瓦斯爆炸温度变化机理、提高灾害防控技术提供依据。

In order to explore the law of temperature change in the process of gas explosion,the spherical explosion experiments were conducted to study the explosion temperatures under different initial gas concentration conditions and the interaction relationship between the explosion temperature and explosion pressure.The results showed that with the increase of the initial gas concentration,the maximum explosion temperature appeared at 6.5%(low concentration),9.5%(normal concentration)and 12%(high concentration),which were 995 K,932 K and 1153 K,respectively.The temperature delay time and heating time in the explosion process presented a U-shaped change law with the initial gas concentration,and the change was small when the initial gas concentration was about 9.5%(near the normal concentration),while the change was large affected by the gas concentration near the upper and lower explosion limits.When the initial gas concentration was 9.5%,the pressure wave in the process of gas explosion promoted the reverse propagation of the flame combustion wave,resulting in a second increase in temperature.The results can provide basis for perfecting the mechanism of gas explosion temperature change and improving the disaster prevention and control technology.