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Previous studies on the influence of obstacle shapes in gas explosions involved mainly single obstacles whereas only a few studies focused on multi-obstacle with constant spacing between obstacles. This paper is aimed at studying the influence of obstacle spacing on two obstacles of various shapes in a tubular geometry using 10% methane-air mixtures. For single obstacles of 20% blockage, 1-flat-bar produced the highest explosion severity followed by a baffle disc and orifice plate. The reverse was the case for 30% obstacle blockage. In case of double obstacle optimally spaced, 1-flat-bar produced a peak overpressure of 1.29 bar and 2.42 bar for 20% and 30% blockage ratios respectively. Maximum overpressures of 0.81 bar and 2.67 bar were generated for 20% and 30% blockage ratios respectively for double 1-hole obstacles at worst case spacing.

Influence of Obstacle Shapes in a Tubular Geometry with Two Obstacles of Variable Spacing