Bluff-body Thermal Property and Initial State Effects on a Laminar Premixed Flame Anchoring Pattern

Berger, Sandrine; Duchaine, Florent; Gicquel, Laurent

doi:10.1007/s10494-017-9841-y

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…However, in the present study, only the steady state is targeted and the coupling strategy developed at CERFACS [ 50 , 51 ] to rapidly reach steady state that is used. This method has been used with success in numerous applications [ 32 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ]. It consists in desynchronizing the LES and conduction solvers, each advancing with its own time-step adapted to its physics (CFL-driven for reactive flow, Fourier-driven for solid conduction).…”

Section: Computational Setupmentioning

confidence: 99%

Prediction of Wall Heat Fluxes in a Rocket Engine with Conjugate Heat Transfer Based on Large-Eddy Simulation

Potier

Duchaine

Cuenot

et al. 2022

Entropy

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Although a lot of research and development has been done to understand and master the major physics involved in cryogenic rocket engines (combustion, feeding systems, heat transfer, stability, efficiency, etc.), the injection system and wall heat transfer remain critical issues due to complex physics, leading to atomization in the subcritical regime and the interactions of hot gases with walls. In such regimes, the fuel is usually injected through a coaxial annulus and triggers the atomization of the central liquid oxidizer jet. This type of injector is often referred to as air-assisted, or coaxial shear, injector, and has been extensively studied experimentally. Including such injection in numerical simulations requires specific models as simulating the atomization process is still out of reach in practical industrial systems. The effect of the injection model on the flame stabilization process and thus on wall heat fluxes is of critical importance when it comes to the design of wall-cooling systems. Indeed, maximizing the heat flux extracted from the chamber can lead to serious gain for the cooling and feeding systems for expander-type feeding cycles where the thermal energy absorbed by the coolant is converted into kinetic energy to drive the turbo-pumps of the feeding system. The methodology proposed in this work to numerically predict the flame topology and associated heat fluxes is based on state-of-the-art methods for turbulent reactive flow field predictions for rocket engines, including liquid injection, combustion model, and wall treatment. For this purpose, high-fidelity Large Eddy Simulation Conjugate Heat Transfer, along with a reduced kinetic mechanism for the prediction of H2/O2 chemistry, liquid injection model LOx sprays, and the use of a specific wall modeling to correctly predict heat flux for large temperature ratio between the bulk flow and the chamber walls, is used. A smooth and a longitudinally ribbed combustor configuration from JAXA are simulated. The coupling strategy ensures a rapid convergence for a limited additional cost compared to a fluid-only simulation, and the wall heat fluxes display a healthy trend compared to the experimental measurements. An increase of heat transfer coherent with the literature is observed when walls are equipped with ribs, compared to smooth walls. The heat transfer enhancement of the ribbed configuration with respect to the smooth walls is coherent with results from the literature, with an increase of around +80% of wall heat flux extracted for the same chamber diameter.

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Section: Computational Setupmentioning

confidence: 99%

Prediction of Wall Heat Fluxes in a Rocket Engine with Conjugate Heat Transfer Based on Large-Eddy Simulation

Potier

Duchaine

Cuenot

et al. 2022

Entropy

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“…Overall, with increasing radius of the flame-holder, wider blowoff limits are observed. Previous numerical and experimental studies that involved conjugate heat transfer or the measurement of burner temperature (or heat flux) [5,14,21,22] , all presented small sections of the velocity range between flashback and blow-off limits. According to our knowledge, this is the first time a detailed trend of heat loss (with RZ present or absent) has been studied for flame holders of different sizes between the flashback and blow-off limits.…”

Section: Heat Loss and Rz Lengthmentioning

confidence: 99%

“…In their study, the flame base was not influenced by the presence of a RZ. An extensive study into the role of conjugate heat transfer (CHT) between the solid bluff body and flow was presented by Berger et al [14] for the same configuration as in Ref. [6,10] .…”

Section: Introductionmentioning

confidence: 99%

Flame stabilization regimes for premixed flames anchored behind cylindrical flame holders

Vance

Shoshin

Goey

et al. 2021

Proceedings of the Combustion Institute

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“…In the experiments of von Elbe and Menster, the burner was externally cooled for H 2 -air flames, which suppresses the effect of increase in flame speed by pre-heating. Recent laminar direct numerical simulations [11][12][13][14][15][16][17][18] , have highlighted the importance of the role of conjugate heat transfer between the fluid and the solid burner on flame stabilization. The critical velocity gradient theory also does not include the effects of flame stretch and preferential diffusion which are known to cause major changes in flame speed [19] .…”

Section: Introductionmentioning

confidence: 99%

Development of a flashback correlation for burner-stabilized hydrogen-air premixed flames

Vance

Goey

Oijen

2022

Combustion and Flame

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Bluff-body Thermal Property and Initial State Effects on a Laminar Premixed Flame Anchoring Pattern

Cited by 12 publications

References 35 publications

Prediction of Wall Heat Fluxes in a Rocket Engine with Conjugate Heat Transfer Based on Large-Eddy Simulation

Prediction of Wall Heat Fluxes in a Rocket Engine with Conjugate Heat Transfer Based on Large-Eddy Simulation

Flame stabilization regimes for premixed flames anchored behind cylindrical flame holders

Development of a flashback correlation for burner-stabilized hydrogen-air premixed flames

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