Behaviors of the reacting flowfield during the spontaneous formation of ramjet mode under a supersonic inflow

Wang, Tai-Yu; Cai, Zun; An, Bin; Wang, Jiaoru; Sun, Mingbo; Liang, Chen-Jui; Wang, Zhenguo

doi:10.1063/5.0135294

Cited by 10 publications

(1 citation statement)

References 51 publications

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“…Thus, the dependable prediction of foam propagation in porous media based on the dynamic interaction between multiphase fluids is the key to resolving current problems and limits in foam-related field applications [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Modeling Microscale Foam Propagation in a Heterogeneous Grain-Based Pore Network with the Pore-Filling Event Network Method

Yang,

Lu,

Lin

et al. 2023

Processes

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Foam flooding is an efficient and promising technology of enhanced oil recovery that significantly improves sweep efficiency of immiscible displacement processes by providing favorable mobility control on displacing fluids. Although the advantages in flexibility and efficiency are apparent, accurate prediction and effective control of foam flooding in field applications are still difficult to achieve due to the complexity in multiphase interactions. Also, conventional field-scale or mesoscale foam models are inadequate to simulate recent experimental findings in feasibility of foam injection in tight reservoirs. Microscale modeling of foam behavior has been applied to further connect those pore-scale interactions and mesoscale multiphase properties such as foam texture and the relative permeability of foam banks. Modification on a microscale foam model based on a pore-filling event network method is proposed to simulate its propagation in grain-based pore networks with varying degrees of heterogeneity. The impacts of foam injection strategy and oil-weakening phenomena are successfully incorporated. Corresponding microfluidic experiments are performed to validate the simulation results in dynamic displacement pattern as well as interfacial configuration. The proposed modeling method of foam propagation in grain-based networks successfully captures the effects of lamellae configurations corresponding to various foaming processes. The results of the simulation suggest that the wettability of rock has an impact on the relevance between reservoir heterogeneity and the formation of immobile foam banks, which supports the core idea of the recently proposed foam injection strategy in tight oil reservoirs with severe heterogeneity, that of focusing more on the IFT adjustment ability of foam, instead of arbitrarily pursuing high-quality strong foam restricted by permeability constraints.

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Section: Introductionmentioning

confidence: 99%

Modeling Microscale Foam Propagation in a Heterogeneous Grain-Based Pore Network with the Pore-Filling Event Network Method

Yang,

Lu,

Lin

et al. 2023

Processes

View full text Add to dashboard Cite

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Oscillatory behaviors of multiple shock waves to upstream disturbances

James

2023

Physics of Fluids

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The oscillatory response of multiple shock waves to upstream disturbances in a supersonic flow is studied numerically in a constant area rectangular duct. The flow is accelerated through a nozzle with an exit Mach number of 1.75 and continues in the constant area duct, where multiple shock waves are formed. To investigate the effect of upstream disturbance on shock oscillations, three parameters are varied systematically: upstream turbulent intensity, frequency of upstream pressure fluctuation, and amplitude of upstream pressure fluctuation. The wall shear stress variation along the duct length provides the location of separation and reattachment points in the flow field. The wall pressure frequency spectra were used to investigate the low-frequency unsteadiness in shock oscillations. The power spectral density of the wall static pressure and the probability density function (PDF) of shock location are analyzed, and the results suggest that as the upstream turbulent intensity is increased, the dominant frequency of oscillation is increased and the shock oscillations become more symmetrical. As the upstream disturbance frequency is increased, the shock oscillations become more symmetrical and follow the Gaussian curve closely. The shock wave oscillates with the same upstream excitation frequency when the upstream disturbance amplitude is increased. At large values of upstream disturbance amplitude, the PDF shows a large deviation from the Gaussian, and the rms amplitude of shock oscillation increases monotonously. At higher amplitudes of upstream disturbance excitation, the traces of shock train leading-edge location display path-dependence characteristics.

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Investigation of mixing characteristics of gaseous kerosene scramjet combustor with an oxygen-supplemented strut

2023

AIP Advances

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The mixing state of the fuel determines whether the scramjet combustor can work with high performance. The flow field structure and mixing characteristics of the supersonic combustor are studied by using large eddy simulation. The combustor is equipped with struts and uses gaseous kerosene as fuel. The particularity of the strut is that a row of holes in the tail edge of the strut can inject oxygen into the combustor to enhance mixing. First, the flow field structure without oxygen supplementation is studied, and the evolution rule of the flow direction vortex is analyzed. Second, the mixing performance of the fuel and oxidant is evaluated using mixing efficiency. The mixing performance of the combustor under different fuel injection momentum flux ratios is discussed. Then, the differences in the mixing characteristics of the combustor with and without supplemental oxygen are compared. The influence of different fuel/oxygen momentum flux ratio combinations on mixing performance and flow field characteristics is considered. The effect of oxygen supplementation on the fuel diffusion volume is given at last. The results of this work show that oxygen supplementation can change the flow field characteristics and fuel transportation, and significantly improve the mixing performance.

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Behaviors of the reacting flowfield during the spontaneous formation of ramjet mode under a supersonic inflow

Cited by 10 publications

References 51 publications

Modeling Microscale Foam Propagation in a Heterogeneous Grain-Based Pore Network with the Pore-Filling Event Network Method

Modeling Microscale Foam Propagation in a Heterogeneous Grain-Based Pore Network with the Pore-Filling Event Network Method

Oscillatory behaviors of multiple shock waves to upstream disturbances

Investigation of mixing characteristics of gaseous kerosene scramjet combustor with an oxygen-supplemented strut

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