Experimental study of overpressure and temperature field behaviors of a methane-air mixture with different ignition positions, solid structure obstacles and initial turbulence levels

Xing, Huadao; Qiu, Yanyu; Sun, Shicai; Wang, Mingyang; Li, Bin; Xie, Lei

doi:10.1016/j.fuel.2020.119446

Cited by 31 publications

(11 citation statements)

References 56 publications

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“…Meanwhile, the high-temperature period lasts for the longest duration because the unburnt gas is mainly burnt inside the chamber to form continuous venting of high-temperature burnt gas after front ignition, corresponding to the external flame jet (Figure (c)). In addition, the high-temperature oscillation occurs at a place far from the vent due to a slowed jet velocity of combustion products in the far field and the lower density of burnt gas that is easily affected by the external environment (e.g., buoyancy and wind speed) …”

Section: Resultsmentioning

confidence: 99%

“…The experimental system consists of an ignition system, an intake system, an explosion chamber, a high-speed camera, an infrared camera, and a data acquisition system (Figure ), which is similar to those used in existing research of the authors , and will be briefly described in the context of the current trial. A square stainless chamber with a volume of 1.5 m × 1.5 m × 2.0 m and a vent area of 0.8 m × 0.8 m was constructed (Figure (a)).…”

Section: Methodsmentioning

confidence: 99%

“…Apparatus. The experimental system consists of an ignition system, an intake system, an explosion chamber, a high-speed camera, an infrared camera, and a data acquisition system (Figure 1), which is similar to those used in existing research of the authors 34,35 and will be briefly described in the…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the high-temperature oscillation occurs at a place far from the vent due to a slowed jet velocity of combustion products in the far field and the lower density of burnt gas that is easily affected by the external environment (e.g., buoyancy and wind speed). 35 Figure 12 embodies the relationship between the peak temperature and distance in cases of various vent areas and ignition positions. Comparing Figure 12(a−c), temperature peaks grow at first and reduce then as monitoring positions increase at all ignition positions with a vent area of 0.16 m 2 .…”

Section: Pressure Characteristic Analysismentioning

confidence: 99%

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Experimental Study of External Flame Evolution and Temperature Characteristics after a Methane Explosion in a Rectangular Chamber

Xing

et al. 2023

ACS Omega

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A series of methane-vented explosions were experimentally investigated in a 4.5 m3 rectangular chamber at P 0 = 100 kPa and T 0 = 298 K, and the effects of ignition positions and vent areas on the external flame and temperature characteristics were studied. The results indicate that the vent area and ignition position significantly affect external flame and temperature changes. The external flame is portioned into three stages: an external explosion, a violent flame jet with a blue flame, and a yellow flame venting. The temperature peak first rises and then reduces with increasing distance. Rear ignition produces the largest flame lengths and highest temperature, while front ignition leads to the shortest flame and smallest temperature peak. The maximum flame diameter occurs at central ignition. As vent areas increase, the coupling effect of the pressure wave and the internal flame front weakens and the diameter and peak of the high-temperature peak increase. These results can offer scientific guidance for designing disaster prevention measures and evaluating explosion accidents in buildings.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Pressure Characteristic Analysismentioning

confidence: 99%

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Experimental Study of External Flame Evolution and Temperature Characteristics after a Methane Explosion in a Rectangular Chamber

Xing

et al. 2023

ACS Omega

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“…The ventilators, transportation equipment, and power supply equipment used in the production process of coal mines can all be regarded as obstacles. Li et al − studied the influence of obstacles on the propagation law of gas explosions and obtained the influence mechanism of the number, shape, and blocking rate of different obstacles on the propagation of an explosion. Gao et al − proved that flexible obstacles could also promote the development of flames and shock waves, but the degree of promotion is not as strong as that of solid obstacles.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Cavity Structure in the Excavation Roadway on the Gas Explosion Characteristics

Gao

Liu

et al. 2022

ACS Omega

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Gas explosion accidents are one of the most severe coal mine disasters. Usually, they can cause considerable property losses and casualties, which seriously restrict the development of the coal mining industry. This study used Ansys/Fluent software to simulate gas explosions in excavation roadways with different cavity structures, and 11 models with different cavity structures were established. The study results show that the propagation law of gas explosion in an excavation roadway with different cavity structures was affected by the cavity shapes, the oval cavity of the long axis/short axis ratio (LA/SA), and the cavity numbers. The overpressure, impulse, and flame speed decreased when a cavity existed, compared to the values in a tube without a cavity. The values of overpressure, impulse, and flame speed were smallest in a rectangular cavity. Furthermore, with increasing the LA/SA, the strength of the gas explosion was reduced significantly. The more the cavities were, the better the intensity of gas explosions was controlled. The research results can provide theoretical support and an experimental basis for preventing and controlling gas explosion accidents.

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Effect of burst pressure and vented area on vented hydrogen explosions

Qing,

Jiapeng,

Yongxu

et al. 2024

J Therm Anal Calorim

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Experimental study of overpressure and temperature field behaviors of a methane-air mixture with different ignition positions, solid structure obstacles and initial turbulence levels

Cited by 31 publications

References 56 publications

Experimental Study of External Flame Evolution and Temperature Characteristics after a Methane Explosion in a Rectangular Chamber

Experimental Study of External Flame Evolution and Temperature Characteristics after a Methane Explosion in a Rectangular Chamber

Influence of the Cavity Structure in the Excavation Roadway on the Gas Explosion Characteristics

Effect of burst pressure and vented area on vented hydrogen explosions

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