Experimental study of gas deflagration temperature distribution and its measurement

Zhang, Qi; Li, Wei; Lin, Dachao; Duan, Yun; Liang, Huimin

doi:10.1016/j.expthermflusci.2010.12.001

Cited by 16 publications

(4 citation statements)

References 22 publications

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“…Sphere, V = 20 L [17][18][19] The variation of maximum rates of pressure rises against methane composition at various initial pressures is shown in Figures 10 and 11, where data obtained in normal conditions and in the presence of a radioactive source were plotted. The rates of pressure rise increase with the increasing initial pressure at all methane concentrations.…”

Section: Pmax/kpa Reference 700mentioning

confidence: 99%

“…The study of methane-air explosions in closed vessels has been made in a wide range of conditions: mixtures with methane concentration between 5-15 vol.%, at various initial temperatures and pressures. In most of these studies, vessels with a low aspect ratio (length/diameter) have been used: spheres with volumes between 0.1 L and 25 m 3 [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Usually, a central position of the ignition source was chosen since this condition determines the highest explosion pressure and the highest rate of pressure rise.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study of Ignition and Flame Propagation for Methane–Air Mixtures in Small Vessels

et al. 2021

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Methane is one of the most common gaseous fuels that also exist in nature as the main part of the natural gas, the flammable part of biogas or as part of the reaction products from biomass pyrolysis. In this respect, the biogas and biomass installations are always subjected to explosion hazards due to methane. Simple methods for evaluating the explosion hazards are of great importance, at least in the preliminary stage. The paper describes such a method based on an elementary analysis of the cubic law of pressure rise during the early stages of flame propagation in a symmetrical cylindrical vessel of small volume (0.17 L). The pressure–time curves for lean, stoichiometric and rich methane–air mixtures were recorded and analyzed. From the early stages of pressure–time history, when the pressure increase is equal to or less than the initial pressure, normal burning velocities were evaluated and discussed. Qualitative experiments were performed in the presence of a radioactive source of 60Co in order to highlight its influence over the explosivity parameters, such as minimum ignition energy, maximum rate of pressure rise, maximum explosion pressure and normal burning velocity. The results are in agreement with the literature data.

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Section: Pmax/kpa Reference 700mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Ignition and Flame Propagation for Methane–Air Mixtures in Small Vessels

et al. 2021

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“…To prevent a gas explosion hazard arising in the event of an accident, vented explosion has been widely used as an effective, direct, and safe protective method. However, explosion venting allows the release of unburnt gas via the vent, forming an external explosion that results in thermal hazards to nearby structures and personnel. , Therefore, studies of the external flame and temperature characteristics during a vented explosion are indispensable for the prevention of a methane explosion.…”

Section: Introductionmentioning

confidence: 99%

“…However, explosion venting allows the release of unburnt gas via the vent, forming an external explosion that results in thermal hazards to nearby structures and personnel. 8 , 9 Therefore, studies of the external flame and temperature characteristics during a vented explosion are indispensable for the prevention of a methane explosion.…”

Section: Introductionmentioning

confidence: 99%

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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Analysis of the temperature distribution in the explosion of a methane/air mixture in a tunnel

Zhang

Pang

2012

J Eng Phys Thermophy

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Experimental study of gas deflagration temperature distribution and its measurement

Cited by 16 publications

References 22 publications

Experimental and Numerical Study of Ignition and Flame Propagation for Methane–Air Mixtures in Small Vessels

Experimental and Numerical Study of Ignition and Flame Propagation for Methane–Air Mixtures in Small Vessels

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

Analysis of the temperature distribution in the explosion of a methane/air mixture in a tunnel

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