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Vortical flows over a delta wing at high angles of attack

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Abstract

The vortex flow characteristics of a sharp-edged delta wing at high angles of attack were studied using a computational technique. Three dimensional, compressible Reynolds-averaged Navier-Stokes equations were solved to understand the effects of the angle of yaw, angle of attack, and free stream velocity on the development and interaction of vortices and the relationship between suction pressure distributions and vortex flow characteristics. The present computations gave qualitatively reasonable predictions of vortical flows over a delta wing, compared with past wind tunnel measurements. With an increase in the angle of yaw, the symmetry of the pair of leading edge vortices was broken and the vortex strength was decreased on both windward and leeward sides. An increase in the free stream velocity resulted in stronger leading edge vortices with an outboard movement.

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Abbreviations

Cp :

Static pressure coefficient

c :

Chord length

E:

Total energy per unit mass

H:

Total enthalpy per unit mass

k:

Turbulent kinetic energy

Prt :

Turbulent Prandtl number

p:

Pressure in pascal

s:

Local semi-span

t:

Time

T:

Temperature in Kelvin

Ui :

Velocity in ith direction

u' i :

Velocity fluctuation in ith direction

V:

Free stream velocity

Xi :

Coordinates in ith direction

ε:

Turbulent dissipation rate

α:

Angle of attack

β:

Angle of yaw

ĸ:

Thermal conductivity

μ:

Viscosity

μt :

Turbulent viscosity

ρ:

Density

τj :

Deviatoric stress tensor

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Authors and Affiliations

  1. School of Mechanical Engineering, Andong National University, 388 Songcheon-dong, Andong, 760-749, Kyeongbuk, Korea

    Young-Ki Lee & Heuy-Dong Kim

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  1. Young-Ki Lee
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  2. Heuy-Dong Kim
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Correspondence to Heuy-Dong Kim.

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Lee, YK., Kim, HD. Vortical flows over a delta wing at high angles of attack. KSME International Journal 18, 1042–1051 (2004). https://doi.org/10.1007/BF02990877

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  • DOI: https://doi.org/10.1007/BF02990877

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