Abstract
A study on a hydrogen-fuelled single-cycle pulse detonation device, through pressure and spontaneous emission measurements, was carried out. Detonation initiation was effectively achieved by applying a 65 J microsecond discharge associated with the Shchelkin spiral with very small errors in the diagnostic method. OH* and H2O* temporal emission measurements were applied at the nozzle exit to establish correlations to specific impulses, determined from pressure curves. OH* emission images were also captured to verify detonation propagation at the exhaust. Both the OH* and H2O* emitters correlated well with the specific impulses, and the integrated areas under emission peak maxima resulted in improved correlations. It was found that the OH* amount per kilogram of fuel grows exponentially with the specific impulse based on fuel, while the H2O* emission area per kilogram of mixture decays exponentially with the specific impulse, based on the mixture. The OH* images demonstrate stable detonation propagations and validate the established correlations. Furthermore, a new optical method was developed for detonation cycle diagnostics.
Published Version
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