Numerical investigation of detonation propagation through small orifice holes

Abstract

The propagation of a detonation wave along a tube filled with a hydrogen-oxygen mixture, diluted with argon in the presence of obstacles with small orifice hole has been investigated numerically. The numerical simulations are performed in a two-dimensional domain using adaptive mesh refinement and by solving compressible Euler equations for multiple thermally perfect species with a reactive source term. The premixed mixture of H2: O2: Ar at a ratio 2: 1:7 at 10.0 kPa and 298 K has been used in a 90 mm diameter tube with a detonation wave travelling from one end. It was observed that a single orifice placed at 200 mm from one end of the tube, with varying diameters of 6, 10, 14, 16, 18, 30, and 50 mm show an initial decoupling of the detonation wave into a shockwave and flame front. Along the tube the detonation wave fails to propagate for orifice diameters less than \lambda, while it propagates by different re-initiation pathways for orifice diameters greater than \lambda, where \lambda is the cell-width for regular detonation propagation. This paper details the observed detonation re-initiation and failure in a detonation re-initiation mechanism for the cases considered.

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ORCID for Ralf Deiterding: orcid.org/0000-0003-4776-8183

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