管道内瓦斯爆炸火焰传播压力与温度特性

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 ℃, respectively.