Abstract
Rock spallation induced by thermal stress can be used to drill through hard rock at high rates. In order to characterize the importance of operating parameters on rock penetration rate and hole geometry, a modeling effort was initiated. Because supersonic flame jets are used to induce thermal stress in practical spallation drilling systems, a comprehensive treatment of turbulent gas phase heat, mass, and momentum transport was developed and coupled to a rock mechanics-based model of thermal stress induced failure. Work reported in this paper provides the mathematical framework, governing equations, and computational algorithms and compares model-predicted results to experimental data when possible.
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