Black-Box Modeling of Rotating Detonation Combustors and Their Injector Plena Coupling

Anand, Vijay; George, Andrew St.; Jodele, Justas; Knight, Ethan; Gutmark, Ephraim

doi:10.2514/1.j058263

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…No information can be exchanged between the combustion and injection processes: they are decoupled. However, as noted by many (see [4], for example), the detonation waves posses a peak pressure typically an order of magnitude greater than that of the injector feed. The implication is that the acoustic isolation is lost and the injection and combustion processes become coupled.…”

Section: Introductionmentioning

confidence: 92%

“…This is a Hopf bifurcation with the injection sensitivity threshold (u p ) as the bifurcation parameter. This instability physically corresponds to the axial injectorcombustion-exhaust resonance experimentally observed by many in literature [4,37]. We use the open-source finite volume code PyClaw [34] to perform the direct numerical simulations of the model and the Matlab-based software pde2path [59,60] to perform the numerical continuation.…”

Section: B Modulation Of the Deflagration Statementioning

confidence: 99%

“…Such modulation is apparent in the spectral content of fast-response instrumentation, such as in piezo-electric pressure sensors or high-speed camera footage, where spectral sidebands are present and symmetric about a dominant carrier frequency [11]. Lastly, extreme events such as chaotic propagation, especially during times of ramp-up or ramp-down of propellant feed, have been observed experimentally [4].…”

Section: Introductionmentioning

confidence: 99%

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Multi-scale Physics of Rotating Detonation Engines: Autosolitons and Modulational Instabilities

Koch,

Kurosaka,

Knowlen

et al. 2020

Preprint

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We develop a theoretical framework that predicts and fully characterizes the diverse experimental observations of the nonlinear, combustion wave propagation in a rotating detonation engine (RDE), including the nucleation and formation of combustion pulses, the soliton-like interactions between these combustion fronts, and the fundamental, underlying Hopf bifurcation to time-periodic modulation of the waves. In this framework, the mode-locked structures are classified as autosolitons, or stably-propagating nonlinear waves where the local physics of nonlinearity, dispersion, gain, and dissipation exactly balance. We find that the global dominant balance physics in the RDE combustion chamber are dissipative and multi-scale in nature, with local fast scale (nano-to microseconds) combustion balances generating the fundamental mode-locked autosoliton state, while slow scale (milliseconds) gain-loss balances determine the instabilities and structure of the total number of autosolitons. In this manner, the global multi-scale balance physics give rise to the stable structuresnot exclusively the frontal dynamics prescribed by classical detonation theory. Experimental observations and numerical models of the RDE combustion chamber are in strong qualitative agreement with no parameter tuning. Moreover, numerical continuation (computational bifurcation tracking) of the RDE analog system establishes that a Hopf bifurcation of the steadily propagating pulse train leads to the fundamental instability of the RDE, or time-periodic modulation of the waves. Along branches of Hopf orbits in parameter space exist a continuum of wave-pair interactions that exhibit solitonic interactions of varying strength.

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Section: Introductionmentioning

confidence: 92%

Section: B Modulation Of the Deflagration Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-scale Physics of Rotating Detonation Engines: Autosolitons and Modulational Instabilities

Koch,

Kurosaka,

Knowlen

et al. 2020

Preprint

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show abstract

“…In response to some of the most recent research progress, we have compiled this Special Section on "Recent Progress on Rotating Detonation and Its Application," comprising one survey [15] and seven regular technical articles [16][17][18][19][20][21][22]. The survey [15] provides a comprehensive introduction to recent progress and development trends of the continuous detonation engine, particularly within the last five years.…”

mentioning

confidence: 99%

“…Several contributions to RDE modeling are also included. Anand et al [21] propose a black-box model of the RDE to investigate the onset process after ignition in combustors. The dynamics of air and fuel plenums and plena/combustor coupling are further elucidated.…”

mentioning

confidence: 99%

Introduction to the Special Section on Recent Progress on Rotating Detonation and Its Application

2020

AIAA Journal

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Response of angled and tapered liquid injectors to passing detonation fronts at high operating pressures

et al. 2021

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Black-Box Modeling of Rotating Detonation Combustors and Their Injector Plena Coupling

Cited by 11 publications

References 33 publications

Multi-scale Physics of Rotating Detonation Engines: Autosolitons and Modulational Instabilities

Multi-scale Physics of Rotating Detonation Engines: Autosolitons and Modulational Instabilities

Introduction to the Special Section on Recent Progress on Rotating Detonation and Its Application

Response of angled and tapered liquid injectors to passing detonation fronts at high operating pressures

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