Thermophysical characteristics of shear-coaxial LOX–H2 flames at supercritical pressure

Oefelein, Joseph C.

doi:10.1016/j.proci.2004.08.212

Cited by 144 publications

(77 citation statements)

References 20 publications

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“…The baseline theoretical-numerical framework combines a general treatment of the governing conservation and state equations with state-of-the-art numerical algorithms and massivelyparallel programming paradigms [59][60][61][62][63]. The numerical formulation treats the fully-coupled compressible form of the conservation equations, but can be evaluated in the incompressible limit.…”

Section: Large Eddy Simulationsmentioning

confidence: 99%

Understanding and predicting soot generation in turbulent non-premixed jet flames.

Wang

Kook²,

Doom³

et al. 2010

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This report documents the results of a project funded by DoD's Strategic Environmental Research and Development Program (SERDP) on the science behind development of predictive models for soot emission from gas turbine engines. Measurements of soot formation were performed in laminar flat premixed flames and turbulent non-premixed jet flames at 1 atm pressure and in turbulent liquid spray flames under representative conditions for takeoff in a gas turbine engine. The laminar flames and open jet flames used both ethylene and a prevaporized JP-8 surrogate fuel composed of n-dodecane and m-xylene. The pressurized turbulent jet flame measurements used the JP-8 surrogate fuel and compared its combustion and sooting characteristics to a world-average JP-8 fuel sample. The pressurized jet flame measurements demonstrated that the surrogate was representative of JP-8, with a somewhat higher tendency to soot formation. The premixed flame measurements revealed that flame temperature has a strong impact on the rate of soot nucleation and particle coagulation, but little sensitivity in the overall trends was found with different fuels. An extensive array of non-intrusive optical and laser-based measurements was performed in turbulent non-premixed jet flames established on specially designed piloted burners. Soot concentration data was collected throughout the flames, together with instantaneous images showing the relationship between soot and the OH radical and soot and PAH. A detailed chemical kinetic mechanism for ethylene combustion, including fuel-rich chemistry and benzene formation steps, was compiled, validated, and reduced. The reduced ethylene mechanism was incorporated into a high-fidelity LES code, together with a momentbased soot model and models for thermal radiation, to evaluate the ability of the chemistry and soot models to predict soot formation in the jet diffusion flame. The LES results highlight the importance of including an optically-thick radiation model to accurately predict gas temperatures and thus soot formation rates. When including such a radiation model, the LES model predicts mean soot concentrations within 30% in the ethylene jet flame. 3This page left intentionally blank.

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Section: Large Eddy Simulationsmentioning

confidence: 99%

Understanding and predicting soot generation in turbulent non-premixed jet flames.

Wang

Kook²,

Doom³

et al. 2010

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“…The application of LES to unsteady combustion in rocket engines is more recent [31][32][33] and more complex due to the particular thermodynamics and flow-dynamics conditions.…”

Section: Numerical Simulations Of Rocket Ignition Are Mainly Based Onmentioning

confidence: 99%

Large eddy simulation of laser ignition and compressible reacting flow in a rocket-like configuration

Lacaze

Cuenot

Poinsot

et al. 2009

Combustion and Flame

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“…Therefore, conventional predictions of thermodynamic properties and mixing dynamics become inappropriate in explaining thermodynamic relationships for a wide range of pressures and temperatures which have to employ recent advances in numerical research. The thermo-physical characteristics of liquid oxygen/gaseous hydrogen flame in a shear coaxial injector at supercritical pressure using direct numerical simulation have been investigated by Oefelein [2]. The diffusion dominated mode of combustion and the sharp gradients of thermo-physical properties were identified in the region close to the injector element.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the SGS models are based on the eddy-viscosity Int'l J. of Aeronautical & Space Sci. 16 (2), 254-263 (2015) type model. The algebraic Smagorinsky model proposed by Lilly [6,7] is the most widely used in LES.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dynamic SGS Model in a Kerosene-LOx Swirl Injector under Supercritical Condition

Heo¹,

Hong²,

Sung³

2015

International Journal of Aeronautical and Space Sciences

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In this study, numerical simulations are carried out to investigate the dynamic SGS model effects in a Kerosene-LOx coaxial swirl injector under high pressure conditions. The turbulent model is based on large-eddy simulation (LES) with real-fluid transport and thermodynamics. To assess the effect of the dynamic subgrid-scale (SGS) model, the dynamic SGS model is compared with that of the algebraic SGS model. In a swirl injector under supercritical pressure, the characteristics of temporal pressure fluctuation and power spectral density (PSD) present comparable discrepancies dependant on the SGS models, which affect the mixing characteristics. Mixing efficiency and the probability density (PDF) function are conducted for a statistical description of the turbulent flow fields according to the SGS models. The back-scattering of turbulent kinetic energy is estimated in terms of the film thickness of the swirl injector.

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Thermophysical characteristics of shear-coaxial LOX–H2 flames at supercritical pressure

Cited by 144 publications

References 20 publications

Understanding and predicting soot generation in turbulent non-premixed jet flames.

Understanding and predicting soot generation in turbulent non-premixed jet flames.

Large eddy simulation of laser ignition and compressible reacting flow in a rocket-like configuration

Effect of Dynamic SGS Model in a Kerosene-LOx Swirl Injector under Supercritical Condition

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