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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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