Abstract
Interaction of a vortex with a blade, wing or fin may involve both rapid distortion of the incident vorticity field and unsteady flow near the surface. A variety of flow visualization methods were applied in the experiment to observe the change of flow characteristics during a streamwise vortex–surface interaction. Particle image velocimetry measurements were carried out on a 2-D flow field in the near-wall area. The topology structure of the flow field during the vortex–surface interaction was obtained. The near-wall vorticity layer caused by the primary vortex formed secondary vortex. The initial strength of the incident vortex and distance between vortex core and the surface are the main parameters that affect the characteristics of flow field. The relevant results will help further study on the mechanism of interaction.
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Abbreviations
- x, y, z :
-
Axis of coordinates
- u, v, w :
-
Velocity component on three axes
- d :
-
Distance between leading edge of plate model and tailing edge of vortex generator
- h :
-
Distance between primary vortex core and plate at leading edge
- c :
-
Chord of vortex generator
- α :
-
AOA of vortex generator
- Re :
-
Reynolds number based on c, Re = V∞c/v0
- v 0 :
-
Kinematic viscosity
- Ω :
-
Parameter of omega method
- V ∞ :
-
Velocity of free stream
- Г 0 :
-
Initial strength of the main vortex
- ξ :
-
Vorticity
- Г :
-
Vortex strength
- VG:
-
Vortex generator
- VI:
-
Vortex interaction
- PriV:
-
Primary vortex
- 2ndV:
-
Secondary vortex
- PIV:
-
Particle image velocimetry
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Acknowledgements
The authors would like to acknowledge the assistance and suggestions of the other members in Aerodynamic Laboratory of NUAA including Qiang Zhang and Hen Xiao. This reach was supported by the National Natural Science Foundation of China (11672134).
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Sun, Z., Gu, Y. & Zhao, H. Experimental investigation on the streamwise vortex–surface interaction. J Vis 22, 477–488 (2019). https://doi.org/10.1007/s12650-018-00544-3
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DOI: https://doi.org/10.1007/s12650-018-00544-3