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Gas explosion experiment system: (a) high energy ignition device; (b) air compressor; (c) vacuum pump; (d) vacuum meter; (e) gas explosion experimental pipe; (f) analysis system of dynamic data.
Source publication
In order to research on gas exploration shock wave spread law via a one-way bifurcation pipeline, the gas exploration pipeline experimental system and numerical calculation model were established. By adopting the comparative analysis of experiments and numerical modeling, it conducted researches on the attenuation and shunt characteristics of the g...
Citations
... Yin et al. [21] studied the propagation characteristics, eddy current generation, and quenching performance of detonation waves in variable structure pipelines. Jia et al. [22] obtained the attenuation law of pipeline explosion shock waves in bifurcated pipelines. Xue et al. [23,24] obtained the rule of U-shaped pipe structure on wave propagation of gas explosion. ...
This paper explores the effects of an abrupt cross-section area change of gas pipes on the propagation law of explosion. For this, an explosion pipe experimental system was established, and a numerical research was conducted. By experimental and numerical simulation, the evolution of the overpressure, temperature, vorticity, and kinetic energy of shock waves of gas explosion in abrupt pipelines was investigated. This allowed us to obtain expressions for the attenuation coefficient, increase coefficient, and reflection coefficient of gas explosion overpressure. The study indicates that an abrupt increase of the pipeline cross-section area leads to a decrease of shock wave overpressure and vice versa. For a given change of cross-section area, the attenuation coefficient gradually increases as the initial peak overpressure rises, whereas the increase coefficient and reflection coefficient both present a decreasing trend. An abrupt change in the pipe structure can inhibit the propagation of gas explosion flames. The explosive gas is affected by the turbulence effect after passing through the middle large-diameter pipe, and the vorticity curve exhibits a clear peak. In addition, the large eddy motion caused by strong confinement increases the kinetic energy of the gas in pipes. The above research outcomes contribute to further enriching the basic theory of gas explosion for the study of gas explosion propagation in mining laneway.
... Yin et al. [22] studied the propagation performance of a gasoline and air two-phase detonation wave in pipes with variable cross-sections through numerical simulations and found that the detonation wave produced an eddy current at the inflection point of the variable cross-section area and exhibited quenching. Jia et al. [23,24] studied the gas exploration shock wave spread law via a one-way bifurcation pipeline and obtained computational formulas for the shock wave attenuation coefficients of branch pipelines and straight pipelines and the shock wave shunt coefficients of branch pipelines. Frolov et al. [25,26] studied the deflagration to the detonation process in U-shaped structural pipes, while Zhu et al. [27,28] found that the turning and bifurcation structures produce turbulence and studied the mechanism of flame acceleration. ...
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.
