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Mechanism of unconventional aerodynamic characteristics of an elliptic airfoil
- Source :
- Chinese Journal of Aeronautics, Vol 28, Iss 3, Pp 687-694 (2015)
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- The aerodynamic characteristics of elliptic airfoil are quite different from the case of conventional airfoil for Reynolds number varying from about 10 4 to 10 6 . In order to reveal the fundamental mechanism, the unsteady flow around a stationary two-dimensional elliptic airfoil with 16% relative thickness has been simulated using unsteady Reynolds-averaged Navier–Stokes equations and the γ - Re θ t ‾ transition turbulence model at different angles of attack for flow Reynolds number of 5 × 10 5 . The aerodynamic coefficients and the pressure distribution obtained by computation are in good agreement with experimental data, which indicates that the numerical method works well. Through this study, the mechanism of the unconventional aerodynamic characteristics of airfoil is analyzed and discussed based on the computational predictions coupled with the wind tunnel results. It is considered that the boundary layer transition at the leading edge and the unsteady flow separation vortices at the trailing edge are the causes of the case. Furthermore, a valuable insight into the physics of how the flow behavior affects the elliptic airfoil’s aerodynamics is provided.
- Subjects :
- Airfoil
Aerodynamic characteristics
Leading edge
Flow separation
Mechanical Engineering
Reynolds number
Aerospace Engineering
TL1-4050
Mechanics
Elliptic aerofoil section
Starting vortex
Physics::Fluid Dynamics
symbols.namesake
Classical mechanics
Boundary layer transition
Kutta–Joukowski theorem
symbols
Aerodynamic center
Motor vehicles. Aeronautics. Astronautics
Numerical analysis
Mathematics
Wind tunnel
Subjects
Details
- ISSN :
- 10009361
- Volume :
- 28
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Chinese Journal of Aeronautics
- Accession number :
- edsair.doi.dedup.....fb31190e06a5e0b66853284544fec70e
- Full Text :
- https://doi.org/10.1016/j.cja.2015.03.009