Abstract
To explore the effect of different bend pipes on the propagation characteristics of premixed methane-air explosion, the experimental explosion pipe system and numerical model were established. By adopting the comparative analysis of experiments and numerical modeling, it conducted researches on the overpressure evolution of gas explosion shock wave in pipes with different bends and obtained the expressions of attenuation coefficient of shock wave overpressure. The results showed that the change of pipe direction accelerated the attenuation of gas explosion shock wave. The propagation attenuation of gas explosion in the bend pipe was mainly affected by the bending angle and initial peak overpressure before bending. With the increase of the bending angle, the attenuation coefficient of gas explosion shock wave gradually increased. For the same bending angle, the attenuation coefficient of gas explosion shock wave increased with the increase of gas volume. The obtained coupling relationships between attenuation coefficient, bending angle, and initial peak overpressure before bending were useful for estimating the overpressure value after the bend. The results presented in this paper have important significance for the assessment of structures that have been damaged in the mine laneway of gas exploration accidents, further enriching the gas exploration spread theory.
Highlights
Gas explosions are one of the main hazards in coal mining, gas transportation, and related fields [1, 2]
Pipes or roadways that have different bend pipes are widely used in these industries as gas-flow channels
Studies on the effect of different bend pipes on premixed methane-air explosion in pipes are helpful in the design and layout of gas-explosion-suppression systems in coal mines and play an important role in preventing gas explosions or effectively mitigating the damage
Summary
Gas explosions are one of the main hazards in coal mining, gas transportation, and related fields [1, 2]. Numerous theoretical studies have examined the propagation of gas explosion shock waves in pipes with different bend pipes. Gao et al [7] studied the propagation of the explosion wave and pointed out that the destruction of the gas explosion was mainly caused by the high pressure of high-speed airflow and shock waves. The results of the former are representative to some extent, but the influence of the mass force and wall friction is ignored in the derivation, and the models have certain limitations. The abovementioned studies have focused on the propagation characteristics of pressure waves according to built-in obstacles, bifurcated pipes, and pipes with different structures. The results can provide important theoretical guidelines for the prevention and control of gas explosions in different bend pipes
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