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IMAGING RESEARCH FOR THE FORMATION OF EXPLOSIVE ATMOSPHERES
Abstract
In the investigation of gas explosion events resulting from combustible gas leakage, often the formation of the explosive atmosphere at the location of the ignition source is less highlighted, usually being calculated the concentration of combustible gases at the entire volume affected by the explosion; depending on the distance between the gas source and the ignition, the complexity of the geometry (volumes occupied by various solid bodies) and the air currents in that volume (convective currents generated by heat sources, air currents formed between two space openings, etc.), the concentrations of combustible gases may differ locally, reaching the explosive range. To study this phenomenon, a transparent, semi-closed stand was made, in which controlled amounts of methane gas were introduced together with very small mass particles. The diffusion of methane carrying particles was recorded by PIV (Particle Image Velocimetry) techniques. The principle underlying these techniques is the position comparison of the suspended solid particle, located in a transparent and homogeneous fluid environment, a comparison made between two staggered images, with a known time frame. The results of the high-speed camera recordings are then transferred to the Insight 4G application, through which the vector fields of velocities, turbulences and the behaviour of the explosive gas cloud can be highlighted, until the explosive conditions at the location of the initiation source are met. The process of mixing fuel gases with air has usually been explained by the application of diffusion formulas and / or by the calculation of hazardous gas concentrations from accidental leaks or releases. In this context, by visualizing in real time the process of mixing a combustible gas with air, a new field of study is born that can bring a surplus of knowledge in combating explosion events and the development of appropriate protection measures.
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References9
Simulation of the dispersion of substances resulting from gas explosions
Colda, C.I., Vlasin, N.I., Pasculescu, V.M., Burian, C.S., Grecea, D.N.
IOP Conference Series: Earth and Environmental Science, 2020, 609(1), 012030
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Researches regarding gas explosions by combined imagistig methods
Vlasin, N.-L., Ghicioi, E., Florea, G.D., Vass, Z., Chiuzan, E.
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM, 2018, 18(1.3), pp. 777–783
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