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Experimental investigation on the streamwise vortex–surface interaction

  • Zhijun Sun
  • Yunsong GuEmail author
  • Hang Zhao
Regular Paper
First Online:
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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.

Graphical abstract

Keywords

Vortex interaction Secondary vortex Flow visualization Multi-vortices structure 

List of symbols

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

v0

Kinematic viscosity

Ω

Parameter of omega method

V∞

Velocity of free stream

Г0

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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Notes

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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Copyright information

© The Visualization Society of Japan 2019

Authors and Affiliations

  1. 1.College of Aerospace EngineeringNanjing University of Aeronautics and Astronautics (NUAA)NanjingChina

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