LES of Supercritical Combustion in a Gas Turbine Engine

Tramecourt, Nathalie; Menon, Suresh; Amaya, John

doi:10.2514/6.2004-3381

Cited by 8 publications

(5 citation statements)

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“…jỸk , and T sgs ρ g Y k T −Ỹ kT , respectively, and are found to be small and generally neglected in the previous studies [27,[41][42][43]. Another unclosed term in the energy equation is SGS energy fluxes term…”

Section: B Explicit Subgrid-scale Modelmentioning

confidence: 99%

Large-Eddy Simulation of Time Evolution and Instability of Highly Underexpanded Sonic Jets

Yao

Fan

2016

AIAA Journal

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High-pressure jet injection into quiescent air is a challenging fluid dynamics problem in the field of aerospace engineering. Although plenty of experimental, theoretical, and numerical studies have been conducted to explore this flow, there is a dearth of literature detailing the flow evolution and instability characteristics, which is vital to the mixing enhancement design and jet noise reduction. In this paper, a density-based solver for compressible supersonic flow, astroFoam, is developed based on the OpenFOAM library. Large-eddy simulations of highly underexpanded jets with nozzle pressure ratios from 5.60 to 11.21 at a Reynolds number around 10 5 are carried out with a highresolution grid. A grid-convergence study has been conducted to confirm the fidelity of the large-eddy simulation results. The large-eddy simulation results have also been validated against available literature data in terms of the time-averaged near-field properties of underexpanded jets. The turbulent transition processes are revealed based on the instantaneous flow features and are quantitatively resolved according to the jet penetration and maximum width. The vorticity analysis is conducted to understand the turbulent transition mechanism, and it is found that the vortex stretching term plays a leading role on the distortion of the vortex rings in the near field of the jets. The dominant instability modes of jets, visualized by helicity, are quantitatively revealed based on the spectrum and relative phase of pressure fluctuation. The single helical modes corresponding to a phase angle close to 180 deg with the 1 1 helices are dominant for nozzle pressure ratios of 5.60 and 7.47, whereas the complex and multiple helices for the other two higher nozzle pressure ratios are due to the superposition of the single and double helical modes. In addition, the performance of the coarse mesh and different subgrid-scale models on capturing the dominant instability characteristics in large-eddy simulation of underexpanded jets is investigated.

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Section: B Explicit Subgrid-scale Modelmentioning

confidence: 99%

Large-Eddy Simulation of Time Evolution and Instability of Highly Underexpanded Sonic Jets

Yao

Fan

2016

AIAA Journal

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“…Many researchers have used dense grid resolution to limit discretization errors in gradient regions. This approach requires large computational resources and are usually applied to small scale computational domains such as splitter plates [27,28], supercritical jets [29,30], mixing layers [31,32] and single rocket injectors [33,34,35]. Others have employed various dissipation techniques to diffuse gradients and attain sufficient resolution in gradient zones.…”

Section: Introductionmentioning

confidence: 99%

Comparison of energy-, pressure- and enthalpy-based approaches for modeling supercritical flows

et al. 2019

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At supercritical conditions, thermodynamics may become strongly nonlinear which is reflected by large thermodynamic Jacobian values. This means that small variations in density, momentum or energy can result in large pressure perturbations. Because of such nonlinearities, simulations of high-pressure flows are subject to stability issues when the conservative form of the Navier-Stokes system is employed. In high-Reynolds number simulations, transported quantities

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“…The broad consensus is that LES allows an accurate prediction of such supercritical fluid flows, whereby species mixing and combustion within supercritical injection conditions could be addressed in a satisfactory way (e.g. [18,33,51,52]).…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of a Turbulent Multi-component Two-phase Flow Involving Phase Change Processes Under Supercritical Conditions

Kuetemeier

Sadiki

2022

Fluid Mechanics and Its Applications

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The present paper aims at developing a generally valid, consistent numerical description of a turbulent multi-component two-phase flow that experiences processes that may occur under both subcritical and trans-critical or supercritical operating conditions. Within an appropriate LES methodology, focus is put on an Euler-Eulerian method that includes multi-component mixture properties along with phase change process. Thereby, the two-phase flow fluid is considered as multi-component mixtures in which the real fluid properties are accounted for by a composite Peng-Robinson (PR) equation of state (EoS), so that each phase is governed by its own PR EoS. The suggested numerical modelling approach is validated while simulating the disintegration of an elliptic jet of supercritical fluoroketone injected into a helium environment. Qualitative and quantitative analyses are carried out. The results show significant coupled effect of the turbulence and the thermodynamic on the jet disintegration along with the mixing processes. Especially, comparisons between the numerical predictions and available experimental data provided in terms of penetration length, fluoroketone density, and jet spreading angle outline good agreements that attest the performance of the proposed model at elevated pressures and temperatures. Further aspects of transcritical jet flow case as well as comparison with an Eulerian-Lagrangian approach which is extended to integrate the arising effects of vanishing surface tension in evolving sprays are left for future work.

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LES of Supercritical Combustion in a Gas Turbine Engine

Cited by 8 publications

References 0 publications

Large-Eddy Simulation of Time Evolution and Instability of Highly Underexpanded Sonic Jets

Large-Eddy Simulation of Time Evolution and Instability of Highly Underexpanded Sonic Jets

Comparison of energy-, pressure- and enthalpy-based approaches for modeling supercritical flows

Modeling and Simulation of a Turbulent Multi-component Two-phase Flow Involving Phase Change Processes Under Supercritical Conditions

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