Single-Tube Two-Dimensional Evaluation of a Pulse Detonation Engine as a Ramjet Replacement

The performance of an idealized pulse detonation engine (PDE), based on a realistic multi-tube system concept, was evaluated through simulations of the behavior of a singletube. Event timing, geometric and valve inflow parameters calculated with the design version of an analytical model were used as input for subsequent performance calculations based on a limit cycle version of the analytical model, a one-dimensional model based on the method of characteristics and a two-dimensional model based on the computational fluid dynamics (CFD) code Chinook. The CFD methodology was validated through comparison with analytical ramjet calculations and through reproduction of PDE simulations from the open literature. Factors affecting system performance were then evaluated including the importance of thermodynamic consistency in single-γ simulations, the effect of single-γ models, time-averaged pressure, percentage purge, the combined effect of mass flow rate and percentage purge, and the effect of nozzle expansion ratio and nozzle entrance cone angle.

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