An Examination of Dynamic Stall Vortex Inception on a Finite Wmg
In the present study, the behaviour of the vorticity flux on a wing of NACA 0015 cross section was analysed for ramp-up motion over a range of dimensionless pitch rates. The variations in the vorticity flux were examined as a means to identify the role of the vorticity leaving the boundary layer...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Putra Malaysia Press
2000
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3610/1/An_Examination_of_Dynamic_Stall_Vortex_Inception.pdf |
| Summary: | In the present study, the behaviour of the vorticity flux on a wing of NACA 0015 cross section
was analysed for ramp-up motion over a range of dimensionless pitch rates. The
variations in the vorticity flux were examined as a means to identify the role of the
vorticity leaving the boundary layer in the initiation, development and growth of the
dynamic stall vortex. It has been found that there are two main sources of bipolar
vorticity located within the first 3% of the chord at all span wise stations on the wing.
These sources move and change strength as the wing is pitched through the incidence
range. One factor that influences their behaviour is the reduced pitch rate and this effect
is discussed. Further, it is shown that there is an apparent link between the negative
source of vorticity and the first observable manifestation of the dynamic stall vortex on
the pressure distribution near the mid-span. |
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