High-Speed Oxy-Combustion Detonation withMulti-Step Finite Rate Chemical Kinetics usingSpace-Time Method*

Pulse detonation system using oxy-fuel combustion can be used for direct power extraction especially when combined with magnetohydrodynamics (MHD). In the present work, we investigate the use of a space-time conservation element-solution element (CE/SE) method for simulation of high-speed oxy-fuel pulse detonation shock waves. A CE/SE method results in a consistent multi-dimensional formulation for unstructured tetrahedral meshes by providing flux conservation in space and time and eliminating the need for complex Reimann solvers to capture shocks.
The CE/SE solver is extended to include single step H2/Air detonation as well as reduced reaction mechanisms for oxy-fuel detonation. A revised Jones-Lindstedt (JL-R) reaction mechanism accounting for radicals such as O, OH, and H is used as a reduced mechanism to simulate detonation waves from methane-oxygen combustion. The CE/SE solver is being further developed for simulation of compressible reacting flows on 2D unstructured grids. Detailed verification and validation are conducted to evaluate the effectiveness of the CE/SE method for oxy-fuel detonations.