Secondary waves dynamics and their impact on detonation structure in rotating detonation combustors

Chacon, Fabian; Feleo, Alexander; Gamba, Mirko

doi:10.1007/s00193-021-01034-6

Cited by 25 publications

(2 citation statements)

References 32 publications

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“…In their OH* chemiluminescence experiments, Feleo et al and Chacon and Gamba observed zones of chemiluminescence intensity in the post detonation products, suggesting that reactants combust after the passage of the detonation wave [5,17]. This phenomenon, termed as commensal combustion, is the result of an incomplete reaction through the detonation wave, but the exact mechanism by which it occurs is not fully understood [18]. While not a direct measure of heat release, their resulting OH* chemiluminescence experiments showed that the fraction of heat release through the detonation could be estimated to be around 0.25-0.5 [18].…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon, termed as commensal combustion, is the result of an incomplete reaction through the detonation wave, but the exact mechanism by which it occurs is not fully understood [18]. While not a direct measure of heat release, their resulting OH* chemiluminescence experiments showed that the fraction of heat release through the detonation could be estimated to be around 0.25-0.5 [18]. In addition to commensal combustion, it was also shown that wall heat transfers could result in a detonation velocity deficit.…”

Section: Introductionmentioning

confidence: 99%

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Low-Order Model for Detonation Velocity Suppression in Rotating Detonation Combustors

Barnouin

Bach

Gutmark

et al. 2023

AIAA SCITECH 2023 Forum

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A Rotating Detonation Combustor (RDC) is a novel pressure gain combustion device, in which a detonation wave processes steadily around an annulus. It has been experimentally observed that detonation waves in the RDC propagate slower than the idealized Chapman-Jouguet (CJ) speed (as low as approximately 60%) and with lower than expected peak pressures. This work then attempts to develop a low-order model to identify the impact of non-ideal processes on these key detonation properties. Three mechanisms are incorporated: the buffer region created by non-premixed reactant injection, parasitic combustion of reactants, and suppression of the heat release through the detonation. While these sophisticated processes are only coarsely described by such a low-order model, it is shown that their effect results in a partial heat release that supports the detonation wave and can capture the deficit in detonation properties. One special aspect of this model is that it is designed to utilize relatively easily measured experimental data as inputs. This has the objective of providing rough, first order estimates of these more sophisticated processes than would otherwise be available by typical RDC combustor diagnostics. A parametric analysis is conducted for stable detonation runs on the RDC at TU Berlin. Convergence between predicted and experimental values show that a significant proportion of the heat release is lost in the buffer zone, undergoes parasitic combustion or is unable to contribute to the detonation heat release.

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