Simulation of the fire thermal field effect on the explosive charges in a laboratory experiment
Authors: Andreev S.G., Ladov S.V., Fedorov S.V.
Published in issue: #1(85)/2019
DOI: 10.18698/2308-6033-2019-1-1837
Category: Mechanics | Chapter: Mechanics of Liquid, Gas, and Plasma
The article considers a possibility of modeling the initial stage of ignition and decomposition of the charge of an explosive or an explosive composition with different structural insulation when exposed to the thermal field of fire. Approximate modeling on small-sized models was used, associated with using in experiments a fragment of a natural object, where the course of thermal processes coincides with the initial stage of reaction development, determining the undesirable (dangerous) final outcome of external influence. In this case, an external impact on a fragment of a bursting explosive can be characterized by a non-stationary temperature field in an environment having thermal characteristics of explosive compositions, but not possessing chemical activity. A method is proposed for determining the temperature and ignition delay time on small-sized models in laboratory conditions using thermoelectric converters (thermocouples) placed in a bulk of explosive material for measuring temperatures. A laboratory setup has been developed, which allows using a special heat generator to regulate the heat flux (fire field) to the model charge and achieve the required law of temperature variation at the lower end of the charge. An example of the fire and explosion safety estimation is given for samples of explosive mixtures based on TNT and RDX with the aluminum and deterrent additions placed in metal shells with and without an air gap
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