Prediction of Detonation-Induced Disturbances Propagating Upstream into Inlets of Rotating Detonation Combustors

Feleo, Alexander; Shepard, Joshua; Gamba, Mirko

doi:10.2514/6.2021-3687

Prediction of Detonation-Induced Disturbances Propagating Upstream into Inlets of Rotating Detonation Combustors

Conference · Wed Jul 28 00:00:00 EDT 2021 · AIAA Propulsion and Energy 2021 Forum

DOI:https://doi.org/10.2514/6.2021-3687· OSTI ID:1995224

Feleo, Alexander ^[1]; Shepard, Joshua ^[2]; Gamba, Mirko ^[2]

University of Michigan, Ann Arbor; University of Michigan, Aerospace Engineering
University of Michigan, Ann Arbor

Disturbances caused by the detonation wave in a rotating detonation combustor (RDC) propagate upstream through the inlet, and can potentially affect and couple to upstream components, such as turbomachinery or isolators. These disturbances can potentially also affect the operation of the RDC itself. By drawing from the analogy of a detonation wave bounded by an inert gas, the pressure disturbances observed upstream of the inlet are explained as the consequence of the passage of an upstream propagating oblique shock. In this study, the pressure rise in the plenum from the oblique shock is measured in an axial air inlet RDC. The speed of the upstream propagating wave is estimated to be moderately above the acoustic speed of the oxidizer in the plenum. The wave propagates into the plenum despite local regions of choking in the inlet. It is estimated that the time it takes a fluid particle to transit from the plenum to the detonation channel through the inlet is much larger than the rotational time of the detonation wave. This implies that a fluid particle experiences multiple shocks prior to entering the detonation channel. The oblique shock propagating upstream through the inlet area change is modeled by leveraging an analogy with a quasi-1D shock wave moving in a variable area duct with mean (incoming) flow. Due to flow expansion along the area change, fluid particles are found to experience stronger shocks in the inlet than in the plenum, thereby creating different thermodynamic states within the fill region as the oxidizer emerges from the inlet.

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Research Organization:: University of Michigan, Ann Arbor

Sponsoring Organization:: USDOE Office of Fossil Energy and Carbon Management (FECM)

DOE Contract Number:: FE0031228

OSTI ID:: 1995224

Report Number(s):: DOE-UMICH-FE0031228-007

Journal Information:: AIAA Propulsion and Energy 2021 Forum, Journal Name: AIAA Propulsion and Energy 2021 Forum

Country of Publication:: United States

Language:: English

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