Engines based on the inherent higher thermodynamic efficiency of the detonation cycle have been desirable for many years. Rotating detonation engines (RDEs) represent a novel approach to using this thermal cycle without some of the drawbacks of the pulsed detonation engines (PDEs). To date, almost no effort has been made to characterize pollutant formation within RDEs, specifically, NO_x formation. The unique combustion regime of the RDE, compared with more traditional engines, suggests that the emission index of these engines may be substantially different from Brayton-cycle engines. The high pressures and temperatures occurring directly within the detonation wave suggest higher emissions, while the incredibly short residence time and quick drop off of pressure and temperature suggest lower emissions. The focus of this paper is to use a detailed kinetic model previously used for PDEs and SCRAMJET computations to better characterize NO and NO_2 formation within an RDE, and estimate the emission index for a baseline RDE.
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