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VISUALIZATION AND RECORD METHODS FOR THE INITIATION OF AIR-METHANE EXPLOSIVE ATMOSPHERES
Abstract
The cause of the explosion is the thermal energy delivered by the flammable/ fuel ignition source. The action of the ignition source on the flammable medium can be direct or indirect. The most common of the direct sources of ignition are open flames and electric and mechanical sparks. These sources release their energy into the environment, which, if it contains flammable substances in appropriate proportions, is initiated. This is followed by a chain of fuel oxidation reactions and by the propagation of a flame front and a pressure wave, generating what we call an explosion. The present study aimed at obtaining efficient methods of visualizing the initiation phenomenon from the proximity of the ignition source and recording it with high?speed video cameras. The techniques concerned are based on the Schlieren/ Shadowgraph effects, which allow the visualization of density gradients in transparent environments. The recorded physical experiments were carried out on a stand of their own design, aiming to obtain quality images regarding the occurrence of chemical reactions of oxidation caused by the source and the development of the phenomenon in the explosive atmosphere near the source.
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References4
Vlasin N., Ghicioi E., Florea D., Vass Z., Chiuzan E., Researches regarding gas explosions by combined imagistic methods, Proceedings of The 18th International Multidisciplinary Scientific Geoconference SGEM 2018, Bulgaria, Vol. 18, pp 777-783, 2018;
Settles G.S., Schlieren and Shadowgraph Techniques, First Edition, Springer, Berlin Heidelberg, 2001;
Șimon A. B., Ghicioi E., Vlasin N., Florea D., Vass Z., Programming and use of step by step motors in research of air – methane explosive atmospheres, Proceedings of The 20th Young people and multidisciplinary research ISYPMR 2018, Romania, pp 17-22, 2018;
Settles G.S., Hargather M.J., A review of recent developments in schlieren and shadowgraph techniques, Measurement Science and Technology, IOP Publishing, United Kingdom ,2017.
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Number of times cited according to Crossref: 3
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