Modelling confined hydrogen–air detonations with the conservation element/solution element method for varying initial compositions
Year: 2025
Type: article
Abstract: Hydrogen transportation poses significant explosion risks, especially under confined conditions. This study evaluates the accuracy of the Conservation Element/Solution Element (CESE) method, with finite-rate chemistry, for predicting blast loads from confined hydrogen–air detonations at varying initial compositions. A shock tube simulation is compared against one-dimensional theory at the detonation front, using four reaction mechanisms (7 to 19 species). The 7-species mechanism predicts the Chapman–Jouguet (CJ) state within 1%–2% error up to 40 vol% H 2 , offering a computationally efficient option for large simulations, considering that computational time scales with the square of the number of species. While mesh refinement (0.2–2 mm) improves peak pressure prediction, impulse remains 5% underestimated due to the unresolved induction zone. The proposed 2D model – using 7 species, 1 mm mesh size and inviscid flow – is then validated against a confined detonation experiment from literature. It accurately predicts detonation speed, pressure history (including shock reflections), and impulse along the 3-metre chamber. The study provides insight into the applicability and limitations of the CESE-chemistry method in confined detonation scenarios.
Authors: Simão M. Martins, Alexander van Zuijlen, Saullo G.P. Castro
Institution: Delft University of Technology
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,500
OpenAlex ID: W4416918300