STAND FOR RESEARCH ON GAS EXPLOSIONS, BY IMAGING

摘要

The invention relates to a stand for research in the field of the explosions of inflammable gas-air mixtures, by imaging, which allows the recording of the ignition and combustion evolution and flame front development, by means of a high speed camera of more than 30000 frames per second, by using an integrally transparent parallelepipedal explosion chamber, with sizes of up to 110 x 8 x 8 cm, inserted in a special assembly of plane mirrors with maximum sizes of up to 140 cm, mechanically distorted in a controlled manner, in horizontal and vertical plane, respectively, in order to obtain the focal distances for using the Schlieren technique, for the optical viewing of the border between the different densities of the fluids, with a cylindrical incandescent light source, while monitoring the interior pressure, and initiating the explosion with inductive or capacitive electric discharge. According to the invention, the stand consists of an assembly comprising a parallelipipedal explosion chamber (7) with integrally transparent walls, placed in the incident field of light processed by the two mirrors (3 and 5) distorted in the two planes, a horizontal one and a vertical one, assembly inserted between a cylindrical incandescent source (2) with filament of high inertia and a high speed camera (15) coupled to a computer (16), the explosion chamber (7) being equipped with two adjustable electrodes (9), of micro-metrical precision, supplied from a high-voltage source (11) in order to obtain the ignition spark, as well as with two pressure transducers (12) connected to an amplifier (13) and a multi-channel oscilloscope (14) for recording the pressure developed by the explosion of a controlled medium - inflammable air-gas explosive mixture, at various concentrations, and in rest condition or turbulence condition, respectively.