On the effects of reactant stratification and wall curvature in non-premixed rotating detonation combustors

Athmanathan, Venkat; Braun, James; Ayers, Zachary M.; Fugger, Christopher A.; Webb, Austin M.; Slipchenko, Mikhail N.; Paniagua, Guillermo; Roy, Sukesh; Meyer, Terrence R.

doi:10.1016/j.combustflame.2022.112013

Title: On the effects of reactant stratification and wall curvature in non-premixed rotating detonation combustors

Journal Article · Wed Feb 16 00:00:00 EST 2022 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2022.112013· OSTI ID:1976993

^[1];

^[2]; Webb, Austin M. ^[1]; Slipchenko, Mikhail N. ^[3];

^[1]; Roy, Sukesh ^[2];

^[1]

Purdue University, West Lafayette, IN (United States)
Spectral Energies, LLC, Beavercreek, OH (United States)
Purdue University, West Lafayette, IN (United States); Spectral Energies, LLC, Beavercreek, OH (United States)

The optimization of non-premixed rotating detonation combustors (RDCs) requires improved understanding of the coupled effects of reactant stratification, fluid property gradients, and complex shock-wave interactions on the detonation wave structure within annular geometries. In the current work, simultaneous orthogonal views of chemiluminescence and hydroxyl planar laser-induced fluorescence (PLIF) are utilized to establish the existence of a dual-wave system characterized by leading and trailing detonation waves that are closely coupled by the local flow physics. These features are persistent over a wide range of mass flow rates and are consistent with prior observations of non-premixed rotating detonations in annular geometries. The detailed instantaneous time sequences are compared with a 3D reactive unsteady Reynolds averaged Navier-Stokes (URANS) simulation to more clearly elucidate the in-situ combustion dynamics and the sensitivity to reactant inlet conditions. It is found that the dual-wave system results from unburned reactants that survive the leading detonation wave in the injector near field and are consumed within a trailing azimuthal reflected-shock combustion (ARSC) zone. By contrast, the injector far field is characterized by rapid mixing due to a sudden drop to subsonic conditions, and the bifurcated detonation wave structure collapses into a stronger, single-wave detonation front with higher overall pressure ratio as compared with the dual-wave system. While each RDC will have different inflow, mixing, and combustion characteristics, the underlying interactions between the stratified reactants and azimuthal wave dynamics identified through the combination of advanced MHz-rate diagnostics and 3D numerical simulations have important implications for the study of detonation wave stability, mode transition, and combustion efficiency in non-premixed annular RDCs.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); US Air Force Office of Scientific Research (AFOSR); Defense Threat Reduction Agency (DTRA)

Grant/Contract Number:: FE0032075; FA9550-16-1-0315; HDTRA1-17-1-0031

OSTI ID:: 1976993

Journal Information:: Combustion and Flame, Vol. 240, Issue C; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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