Transonic Buffet in Flow Past a Low-Reynolds-Number Airfoil
Publication: Journal of Aerospace Engineering
Volume 37, Issue 6
Abstract
For propeller-driven Mars airplanes operating at low Reynolds numbers, the speed of the rotor tips may reach transonic. To date, only a few studies have investigated the transonic buffet in flow past low-Reynolds-number airfoils. In this study, direct numerical simulations of high-speed flow (, 0.6, and 0.8) past a NACA 0012 airfoil are performed with a low Reynolds number of , where transonic buffet is observed at . We first investigated the effects of Mach number on the aerodynamic performance and flow fields. Dynamic mode decomposition (DMD) and linear stability analysis (LSA) are used to analyze the flow instability mechanisms of the transonic buffet. Results showed that the multiple high-frequency oscillations are related to the vortex shedding at the trailing edge of the airfoil, and the low-frequency oscillation is caused by Type C shock motions. Both of them are confirmed to be self-sustained in feedback cycles.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are proprietary or confidential in nature and may only be provided with restrictions.
Acknowledgments
The funding support of the National Natural Science Foundation of China (Grant No. 12372221) is acknowledged.
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Published In
Journal of Aerospace Engineering
Volume 37 • Issue 6 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Nov 17, 2022
Accepted: May 28, 2024
Published online: Aug 14, 2024
Published in print: Nov 1, 2024
Discussion open until: Jan 14, 2025
ASCE Technical Topics:
- Aerospace engineering
- Air transportation
- Aircraft and spacecraft
- Aircraft wings
- Analysis (by type)
- Continuum mechanics
- Engineering fundamentals
- Engineering mechanics
- Field tests
- Flow (fluid dynamics)
- Flow simulation
- Fluid dynamics
- Fluid mechanics
- Hydraulic engineering
- Hydrologic engineering
- Infrastructure
- Linear analysis
- Models (by type)
- Numerical analysis
- Numerical models
- Reynolds number
- Structural analysis
- Structural engineering
- Tests (by type)
- Transportation engineering
- Water and water resources
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