A parametric study was performed to determine optimal geometries to allow the successful transition of a detonation from a pre-detonator into the main detonation tube of a pulse detonation engine. The study was performed using a two-dimensional Euler solver with progress variables to model the chemistry. The geometrical configuration for the simulations included a pre-detonator that expanded into the main tube as well as a flat plate to divert the flow. A study of plate height and distance from the expansion was done to determine which flat plate geometries transitioned the detonation from the pre-detonator to the main tube. Both successful and unsuccessful geometries were discovered, but further examination showed that the success of a transition was dependent upon where the expansion occured with respect to the structure of the detonation wave. The consequences of this is that the probability of success given a particular geometry is the desired goal of any simulation to develop successful pre-detonators.
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