Abstract
Rotating Detonation Combustor operation is found to ensconce an inherent low frequency pulsation in addition to the dominant frequency of rotation of the Continuous Spin Detonation (CSD) waves. This low frequency oscillation of the CSD waves in a Rotating Detonation Combustor is studied by extracting the frequency, the number of detonation waves present within a period of waxing and waning, and the standard deviation of detonation wave pressure amplitudes. The experiments use a Hydrogen-Air mixture for different air flow rates and equivalence ratios and two parametric design variations: fuel injection orifice size and air injection gap width. The instability is found to be inherently linked to injection sizing, and fuel plenum pressure.
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