Evolution Characteristics Analysis of Supersonic Inlet Buzz with High-Order Dynamic Mode Decomposition Method
Publication: Journal of Aerospace Engineering
Volume 37, Issue 3
Abstract
The buzz evolution process of an axisymmetric supersonic inlet was investigated numerically and analyzed using the high-order dynamic mode decomposition (HODMD) method. Driven by an increasing back-pressure, the flow field evolves from a steady state to little buzz and then to big buzz. The computational dominant frequencies in the stages of little buzz and big buzz were basically consistent with those in the experiment. To analyze the buzz evolution of the global flow field quantitatively, the HODMD method was adopted to provide some dynamics information of modal amplitude and growth rate. During the buzz onset period, the disturbance from the oscillating shock gradually induces pressure fluctuation of the entire inlet. During the buzz transition, the shockwave dynamics at the entrance section of the inlet change first. When the amplitude of the big buzz mode exceeds that of the little buzz mode, the inlet is in the big buzz state, in which the pressure oscillation intensity in the downstream channel is significantly greater than that in the region swept by the shock at the entrance. During the buzz triggering and transition, the growth and attenuation rates of the little buzz mode are higher than those of the big buzz mode, suggesting that the little buzz is less stable than the big buzz. The appearance of high growth rates could be regarded as the precursor of the buzz triggering and the buzz transition.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant numbers 51906208 and 52276040). The team members of the School of Aerospace Engineering of Xiamen University, and the High-Speed Aerodynamic Institute of China Aerodynamics Research and Development Center are acknowledged. In addition, Le Clainche and Vega are also gratefully acknowledged for providing the available reference code online.
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 37 • Issue 3 • May 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 28, 2023
Accepted: Dec 18, 2023
Published online: Feb 28, 2024
Published in print: May 1, 2024
Discussion open until: Jul 28, 2024
ASCE Technical Topics:
- Analysis (by type)
- Axisymmetry
- Biological processes
- Continuum mechanics
- Decomposition
- Dynamic analysis
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Environmental engineering
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Hydraulic engineering
- Hydraulic structures
- Hydrologic engineering
- Inlets (waterway)
- Material mechanics
- Material properties
- Materials engineering
- Mathematics
- Mechanical properties
- Motion (dynamics)
- Numerical analysis
- Oscillations
- Solid mechanics
- Steady states
- Symmetry
- Tension
- Waste management
- Water and water resources
- Waterways
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