Flowing residence characteristics in a dual-mode scramjet combustor equipped with strut flame holder

Qiu, Hongchao; Zhang, Junlong; Sun, Xiaoyan; Chang, Juntao; Bao, Wen; Zhang, Silong

doi:10.1016/j.ast.2020.105718

Cited by 26 publications

(4 citation statements)

References 32 publications

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“…The results of several turbulence models were in agreement with the experimental data, among which the standard k-ε model results stood out due to the small relative error. Since the standard k-ε turbulence model has been validated in quite a few studies to be the reasonable choice in afterburner simulations [28][29][30], it was adopted for the present turbulence calculation. All simulations were carried out using the Fluent pressure-based solver.…”

Section: Selection Of the Turbulence Modelmentioning

confidence: 99%

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

et al. 2021

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Integrated design is a trend in the development of afterburners, and the distribution of cold flow is directly related to their flow field characteristics, combustion organization, and the cooling effect of components. Numerical simulations were performed to illustrate the effects of bypass flow distribution on the flow distribution, mixing characteristics, and cooling efficiency of the components by varying the cooling flow path structure parameters. Within the range of parameters in this study, it can be indicated that with the increase of heat shield inlet height and afterburner annulus height, the total pressure recovery coefficient along the path increased accordingly, and the increasing rate at the afterburner outlet is 1.12% and 1.19%, respectively. The average cooling efficiency of radial flameholder, circumferential flameholder, and fuel injector all decrease, but the rate of decrease varies slightly depending on the location of the components. The increase of heat shield inlet height would reduce thermal mixing efficiency by approximately 5.4% at the afterburner outlet, and the increase of afterburner annular height would increase about 2.9%.

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Section: Selection Of the Turbulence Modelmentioning

confidence: 99%

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

et al. 2021

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“…In order to save the research cost and speed up the research, most scholars currently use numerical simulation to study the flow field of the transverse jet: Qiu used the k-ε standard model for numerical simulation of flowing residence characteristics of the transverse jet [19]; Song and Zhang conducted numerical simulation research on turbulent drag reduction characteristics of transverse jets, using the turbulence model SST k-ω [20]; Demena used the RSM turbulence model to analyze the flow field of the transverse jet in crossflow [21]. However, from the open literature, there is no report on the selection of a suitable turbulence model used for the numerical simulation of the transverse jet, and no unified conclusion has been formed.…”

Section: Turbulence Model Selection and Analysismentioning

confidence: 99%

The Recirculation Zone Characteristics of the Circular Transverse Jet in Crossflow

Yuan

Guo

et al. 2020

Energies

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Transverse jets in crossflow are widely used in energy systems, especially as dilution air jets, fuel/air mixers, and combustion equipment, and have received extensive attention and plenty of research. However, the studies of the circular transverse jet issued from a circular gap at the circumferential direction of a tube in crossflow are very limited. This paper studies a relatively new jet: the circular transverse jet. Firstly, numerical calculations are conducted under different turbulence models but with the same boundary conditions. By comparing the numerical results of different turbulence models with the existing experimental data, the turbulence model which is most suitable for the numerical calculation of the circular transverse jet is selected. Then, this turbulence model is used to calculate and analyze the flow field structure and its characteristics. It is found that due to the aerodynamic barrier effect of the high-velocity jet, a negative pressure zone is formed behind the jet trajectory; the existence of the negative pressure zone causes the formation of a vortex structure and a recirculation zone downstream the circular transverse jet; and the length/width ratio of the recirculation zone does not change with the changes of the crossflow and the jet parameters. It means that the recirculation zone is a fixed shape for a definite device. This would be fundamental references for the studying of fuel/air mixing characteristics and combustion efficiency when the circular transverse jet is used as a fuel/air mixer and stable combustion system.

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“…Therefore, further research is needed to understand the interaction mechanism between gas and jet in cold-flow supersonic engines, identify the key factors influencing fuel jet breakup and atomization, optimize flame stabilization devices, and meet the requirements of practical engineering. To improve the performance of scramjet engines, researchers have conducted extensive studies on cavities, struts, ramps, towers, orifices, and their combinations. Particularly, they emphasize research on the characteristics of transverse liquid jets in supersonic airflow, deepening the understanding of liquid transverse jet atomization and breakup in the supersonic flow fields.…”

Section: Introductionmentioning

confidence: 99%

“…5 Therefore, further research is needed to understand the interaction mechanism between gas and jet in cold-flow supersonic engines, identify the key factors influencing fuel jet breakup and atomization, optimize flame stabilization devices, and meet the requirements of practical engineering. To improve the performance of scramjet engines, researchers have conducted extensive studies on cavities, 6 struts, 7 ramps, 8 towers, 9 orifices, 10 deepening the understanding of liquid transverse jet atomization and breakup in the supersonic flow fields. Through experiments and numerical methods, researchers have explored the flow and combustion characteristics of cavities with different structures in depth.…”

Section: Introductionmentioning

confidence: 99%

Effect of Kerosene Dual-Jet Spacing on the Mixing and Combustion Characteristics of a Scramjet Combustor

Peng,

Zhou,

et al. 2024

ACS Omega

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As the core of a hypersonic propulsion system, the effective mixing efficiency of fuel and air in a supersonic combustor is crucial for its performance. This study focuses on a cold supersonic flow and employs computational fluid dynamics (CFD) techniques combined with Euler−Lagrange method's discretephase model (DPM) for multiphase flows, K−H and R−T (Kelvin−Helmholtz and Rayleigh−Taylor) mixing and atomization models, turbulence models, and surface evaporation models to investigate the injection, atomization, and mixing characteristics of kerosene in supersonic airflow. In order to enhance the mixing efficiency between kerosene and air while reducing flow losses, this study examines a staggered dual-jet injection scheme, with the dual jets arranged at the center of the cavity and having a dual-jet spacing of 10 and 20 mm, respectively. Starting from the interaction mechanism between jets, the impact of different staggered dualjet spacings on the kerosene jet penetration height, span expansion area, angle of the shock wave, and Sauter mean diameter distribution was analyzed. The results show that a short dual-jet spacing (10 mm) leads to greater penetration height, wider span expansion, and a larger angle of the shock wave. When the dual-jet spacing is shorter, the interaction between the fuel jet and the cavity shear layer is stronger, resulting in an improved fuel mixing efficiency. The achievements of this study are consistent with previous experimental measurements and the literature, demonstrating a strong theoretical foundation for optimizing the design of hypersonic engines by deepening the understanding of the fundamental atomization mechanisms of kerosene jets in cold-state supersonic flows. Moreover, these results hold practical significance in improving the efficiency of kerosene combustion and enhancing the performance of flame stabilization devices.

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Flowing residence characteristics in a dual-mode scramjet combustor equipped with strut flame holder

Cited by 26 publications

References 32 publications

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

The Recirculation Zone Characteristics of the Circular Transverse Jet in Crossflow

Effect of Kerosene Dual-Jet Spacing on the Mixing and Combustion Characteristics of a Scramjet Combustor

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