管道内瓦斯爆炸火焰传播压力与温度特性

来源期刊:中南大学学报(自然科学版)2020年第1期

论文作者:王秋红 王二飞 陈晓坤 蒋军成 张明广

文章页码:239 - 248

关键词:瓦斯爆炸;最大爆炸压力;火焰温度;温度峰值

Key words:gas explosion; the maximum explosion pressure; flame temperature; temperature peak

摘    要:为了研究瓦斯爆炸的压力与温度特性,利用矩形管道装置对不同体积分数的瓦斯进行爆炸实验。采用压力传感器和微细热电偶测量爆炸过程中压力与温度的变化,并结合高速摄像仪采集火焰传播图像。研究结果表明:该管道内最大爆炸压力、最大爆炸压力上升速率以及火焰温度峰值都随瓦斯体积分数的增加呈先增加后减小的趋势,到达最大爆炸压力的时间随瓦斯体积分数的增加呈先减小后增大的趋势。该管道上部燃烧比下部燃烧剧烈,下部火焰温度峰值与瓦斯体积分数呈4次函数表达式。在瓦斯爆炸火焰传播过程中,火焰峰面会发生变化,当瓦斯体积分数越接近10%时,越易形成“Tulip”火焰峰面;当瓦斯体积分数为10%时,火焰最明亮,最大爆炸压力和火焰温度峰值都取得最大值,分别为0.74 MPa和1 704.26 °C。

Abstract: In order to study the pressure and temperature characteristics of gas explosion, explosion experiments for the gas different volume fractions were carried out by using a rectangular pipeline. The pressure sensors and the micro thermocouples were used to measure the pressure and temperature changed during the explosion process, and the high-speed camera was used to collect the flame propagation images. The results show that in this pipeline, a distinct trend can be observed for all of maximum explosion pressure, the maximum explosion pressure rise rate, and the flame temperature peak, which is increased first and then decreased as gas concentration increases. Meanwhile, the time reaching maximum explosion pressure is decreased first and then increased with the increase of gas concentration. In addition, the combustion on the upper pipeline is obviously more violent than the lower part, and the temperature peak of the lower flame and the gas concentrations are expressed as four-order function. In the process of gas explosion flame propagation, the flame peak surface will change, and it is easier to form “Tulip” flame surface as the volume fraction is close to 10%. Significantly, when the gas volume fraction is 10%, the flame is the brightest, and it reaches the maximum for the maximum explosion pressure and flame temperature peak, which are 0.74 MPa and 1 704.26 °C, respectively.

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