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COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF HYDROGEN EXPLOSIONS IN EXPERIMENTAL STAND WITH THE CHANGE OF THE PROPAGATION DIRECTION
Abstract
The present paper presents the transfer to the virtual environment and CFD analysis of physical experiments on the explosions of air-hydrogen mixtures carried out on a transparent stand, in the shape of a rectangular spiral. The shape of the stand was designed with the intention of directing the explosion process of the fuel mixture on a rectangular-spiral trajectory, with angles of 90 degrees. The free volume inside the spiral was sectioned by four foiled shutters into four ignition/combustion chambers, the first three chambers (starting with the initiation chamber in the center of the spiral) containing hydrogen concentrations of 25 % volume in relation to air. The purpose of this spiral arrangement was to examine in controlled experimental tests, the behavior of the flame front and to obtain the values of the explosion overpressures, as well as the values of the propagation velocities when the front passes through the four chambers. CFD analysis aims to compare the explosion parameters in the virtual environment with those resulting from physical experiments and obtain a set of values for empirical parameters used within the ANSYS FLUENT application for simulating the chain explosion process, considering the particularity and complexity of the geometry used.
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Vlasin N.I., Pasculescu V.M., Florea D., Cozma E., ?uvar M., Research of air-methane explosions using high speed imagery analysis, Supplement of Quality-Access to Success, Vol. 18, S1, January 2017, pp. 127-132, ISSN 1582-2559, 2017.
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