Detonation Turbulence Interaction

Massa, Luca; Lu, Frank K.; Chauhan, Monika

doi:10.2514/6.2010-351

Cited by 8 publications

(17 citation statements)

References 11 publications

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“…This aspect will be further elucidated by the analysis of the ME in § 4.4. Compared to the numerical solutions of Gamezo et al (1999), Radulescu et al (2007) and Massa, Chauhan & Lu (2011), where the mean shock structure is smeared, the mean shock in our case remains sharp. Note that Henrick et al (2006) have found a very slight increase (less than 0.05 %) of the detonation velocity compared to the ideal CJ, which can be attributed to the presence of fluctuations.…”

Section: Detonation-velocity Deficitmentioning

confidence: 67%

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Mean structure of one-dimensional unstable detonations with friction

2014

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WOS:000332844200022International audienceThis investigation deals with the study of the mean structure of a mildly unstable non-ideal detonation wave. The analysis is based on the integration of one-dimensional reactive Euler equations with friction forces using a third-order Runge-Kutta scheme and a fifth-order weighted essentially non-oscillatory (WENO5) spatial discretization. A one-step Arrhenius reaction mechanism is used for modelling the chemical reaction. When the frictional forces are active, the limit cycle based on the post-shock pressure reveals an enhanced pulsating behaviour of the downstream subsonic reaction zone compared to the ideal case. The results show that the detonation-velocity deficit increases as the mean reaction zone becomes thicker compared to the generalized ZND model. A new master equation, based on the Favre-averaged quantities, is derived and analysed along with new sonicity and thermicity conditions. The analysis of the species, momentum and energy balances reveals that the presence of mechanical fluctuations within the reaction zone constitutes another source of energy withdrawal, meaning that the detonation deviates from its laminar structure. Furthermore, the compressibility of the flow is analysed and the relationships between the fluctuations of temperature, velocity and reactive scalar are discussed in terms of strong Reynolds analogies

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Section: Detonation-velocity Deficitmentioning

confidence: 67%

“…Unlike the approach used by Radulescu et al (2007) and Massa et al (2011), the current method is based on the instantaneous shock location rather than the mean shock position. With (2.3), we get (Zhang & Lee 1994)…”

Section: Appendix a Favre-averaged Equationsmentioning

confidence: 98%

Mean structure of one-dimensional unstable detonations with friction

2014

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“…A fifth-order finite differences WENO scheme with third-order Runge-Kutta time integration was developed and validated by Massa et al 6 In the present study, this algorithm is applied to the analysis of freely propagating detonations with a perturbed inflow. A schematic of the computational set-up is shown in Fig.…”

Section: Iib Fluid Solver and Parametersmentioning

confidence: 98%

“…In the present study, pre-shock turbulent patterns are represented by a canonical model (i.e., frozen and isotropic) for incompressible turbulence. Previous work on canonical detonation-turbulence interaction 6 focused on flow statistics and showed that the fundamental difference between the shock and detonation problems is the presence of a self-excited unstable region in the detonation post-shock, which supports intrinsic time scales (natural frequencies).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mode Decomposition Analysis of Detonation Waves

Kumar

Massa

2012

42nd AIAA Fluid Dynamics Conference and Exhibit

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Dynamic mode decomposition is applied to study the self-excited fluctuations supported by transversely unstable detonations. The focus of this study is on the stability of the limit cycle solutions and their response to forcing. Floquet analysis of the unforced conditions reveals that the least stable perturbations are almost subharmonic with ratio between global mode and fundamental frequency λi/ω f = 0.47. This suggests the emergence of period doubling modes as the route to chaos observed in larger systems. The response to forcing is analyzed in terms of the coherency of the four fundamental energy modes: acoustic, entropic, kinetic and chemical. Results of the modal decomposition suggest that the self-excited oscillations are quite insensitive to vortical forcing, and maintain their coherency up to a forcing turbulent Mach number of 0.3.

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“…Experimental studies have demonstrated that it can be operated for a wide variety of fuels and injection conditions [5,7,19]. Despite these achievements, engine tests are limited to a few seconds or less while factors like heating, injector dynamics, mixing, detonation-turbulence interaction [24], and the effects of curved channels [25] are topics of current investigation.…”

Section: Introductionmentioning

confidence: 99%

Airbreathing Rotating Detonation Wave Engine Cycle Analysis

Braun

Wilson

et al. 2010

46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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A cycle analysis model for an airbreathing, rotating detonation wave engine (RDE) is presented. The engine consists of a steady inlet system with an isolator which delivers air into an annular combustor. A detonation wave continuously rotates around the combustor with side relief as the flow expands towards the nozzle. A model for the side relief is used to find the pressure distribution around the combustor. Air and fuel enter the combustor when the rarefaction wave pressure behind the detonation front drops to the inlet supply pressure. To create a stable RDE, the inlet pressure is matched in a convergence process with the average combustor pressure by increasing the annulus channel radial width with respect to the isolator channel. Performance of this engine is considered using several parametric studies and compared with rocket-mode computational results. A hydrogen-air RDE reaches a specific impulse of 3800 s and can reach a flight speed of Mach 5.

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Detonation Turbulence Interaction

Cited by 8 publications

References 11 publications

Mean structure of one-dimensional unstable detonations with friction

Mean structure of one-dimensional unstable detonations with friction

Dynamic Mode Decomposition Analysis of Detonation Waves

Airbreathing Rotating Detonation Wave Engine Cycle Analysis

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