Supercritical Mixing and Combustion of Liquid-Oxygen/ Kerosene Bi-Swirl Injectors

Wang, Xingjian; Yang, Vigor

doi:10.2514/1.b36262

Cited by 47 publications

(16 citation statements)

References 36 publications

(45 reference statements)

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“…Dissipation was also introduced via artificial diffusion schemes. This latter approach has been employed by Meng and Yang [44] and recently by Masquelet et al [45], Yang et al [46,47]. More advanced artificial viscosity methods have also been derived by Terashima et al [48] and Zong et al [49,50,51,52,28] which combines second and fourth order dissipation operators as well as bulk viscosity.…”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…As the grid resolution increases, finer vortical motions representing smaller turbulent eddies become more evident in the center gaseous core and in the LOX/kerosene mixing zone downstream of the injector exit. Further evidence [23] shows that the distributions of the mean flow properties, such as velocity components, temperature, and density, are nearly independent of the grid resolution beyond level 2. Grid level 3 was thus selected as the benchmark because of its computational efficiency and numerical accuracy.…”

Section: A Grid Independence Studymentioning

confidence: 97%

“…The sensitivity of mixing efficiency and flow dynamics to choice of subgrid scale models was explored [21]. Wang and Yang [22,23] studied the supercritical mixing and combustion of LOX/kerosene bi-swirl injectors. The flame stabilization mechanisms were explained carefully and the kerosene annulus width was identified as an important controlling parameter.…”

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confidence: 99%

Geometric Effects on Liquid Oxygen/Kerosene Bi-Swirl Injector Flow Dynamics at Supercritical Conditions

Wang

Yang

2017

AIAA Journal

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A systematic study is carried out to investigate the flow dynamics and mixing of liquid oxygen/kerosene bi-swirl injectors at supercritical conditions. The theoretical framework is based on the full conservation laws and accommodates real fluid thermodynamics and transport theories over the entire range of fluid states. Turbulence closure is achieved using large-eddy simulation. A grid independence study was conducted to ensure appropriate numerical resolution and accurate flow physics. The liquid-film atomization and breakup processes at subcritical conditions are replaced by the turbulent mixing and diffusion processes typical at supercritical conditions. Various injector geometries, with differences in the recess region, post thickness, and kerosene annulus width, are examined to explore the influence of geometry on mixing efficiency and flow dynamics. A critical mixing line is defined to measure the mixedness of propellants. The presence of a recess region is found to advance the interaction of liquid oxygen and kerosene and improve mixing efficiency. A thicker post of the inner swirler or a wider annulus leads to a larger spreading angle of the inner liquid oxygen film and intercepts the outer kerosene film in a broader area, thereby enhancing mixing in the recess region. The flow structures in the recess region are complex, and the kerosene mass fraction decreases significantly near the post surface, which might increase the thermal load on the surface in the case of reacting flows. Appropriate selection of the post thickness, recess length, and annulus width must be carefully determined for optimum injector performance. The present study offers useful information in biswirl injector design and in studies of the underlying flow physics of swirl injection under supercritical conditions.

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“…An integrated theoretical and numerical framework is established and adopted, to treat supercritical fluid flows and combustion over a broad range of fluid thermodynamic states [8,[28][29][30]. Turbulence closure is achieved using LES.…”

Section: High-fidelity Simulationmentioning

confidence: 99%

Common Proper Orthogonal Decomposition-Based Spatiotemporal Emulator for Design Exploration

et al. 2018

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The present study proposes a data-driven framework trained with high-fidelity simulation results to facilitate decision making for combustor designs. At its core is a surrogate model employing a machine-learning technique called kriging, which is combined with data-driven basis functions to extract and model the underlying coherent structures. This emulation framework encompasses key design parameter sensitivity analysis, physics-guided classification of design parameter sets, and flow evolution modeling for efficient design survey. To better inform the model of quantifiable physical knowledge, a sensitivity analysis using Sobol' indices and a decision tree are incorporated into the framework. This information improves the surrogate model training process, which employs basis functions as regression functions over the design space for the kriging model. The novelty of the proposed approach is the construction of the model through Common Proper Orthogonal Decomposition, which allows for data-reduction and extraction of common coherent structures. The accuracy of prediction of mean flow features for new swirl injector designs is assessed and the dynamic flowfield is captured in the form of power spectrum densities. This data-driven framework also demonstrates the uncertainty quantification of predictions, 2 providing a metric for model fit. The significantly reduced computation time required for evaluating new design points enables efficient survey of the design space.

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Supercritical Mixing and Combustion of Liquid-Oxygen/ Kerosene Bi-Swirl Injectors

Cited by 47 publications

References 36 publications

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

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

Geometric Effects on Liquid Oxygen/Kerosene Bi-Swirl Injector Flow Dynamics at Supercritical Conditions

Common Proper Orthogonal Decomposition-Based Spatiotemporal Emulator for Design Exploration

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