Development of a Two-Dimensional Hydrogen Detonation Analysis Code Devised to Reduce the Numerical Diffusion
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Evaluation of thermal and mechanical loads on the containment vessel due to combustion of flammable gases is essential for addressing the important issues of safety analyses of nuclear power reactors under hypothesized severe accident conditions. In order to predict flammable gas detonation which is the most severe type of combustion, a two-dimensional numerial analysis code COMA has been developed using the explicit finite volume method and non-staggered mesh scheme. A new numerically stable transport calculation method has been devised to facilitate treatment of a large pressure discontinuity at the wave front with the minimum numerical diffusion. The test calculation of detonation propagation in a square cavity surrounded by walls showed that the calculated propagation velocity agreed well with the theoretical velocity by Chapman and Jouguet, and the wave reflection at rigid walls and interaction of detonation waves could be analyzed. The method was then validated through a comparison study with the hydrogen detonation tests in a cylindrical tube performed by NUPEC and BNL. The calculated results agreed with observed overall effects of hydrogen concentration and initial temperature on detonation wave propagation velocities.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 35(4), 278-285, 1998-04-25
Atomic Energy Society of Japan