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Research Papers: Fundamental Issues and Canonical Flows

Experimental Investigation of the Evolution and Head-On Collision of Elliptic Vortex Rings

[+] Author and Article Information
Bin Chen

Professor
State Key Laboratory of Multiphase Flow in
Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: chenbin@mail.xjtu.edu.cn

Zhiwei Wang

State Key Laboratory of Multiphase Flow in
Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China;
Shenzhen Institutes of Advanced Technology,
Chinese Academy of Sciences,
Xueyuan Avenue 1068,
Shenzhen 518035, China

Guojie Li, Yechun Wang

State Key Laboratory of Multiphase Flow in
Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 25, 2014; final manuscript received September 5, 2015; published online October 14, 2015. Assoc. Editor: Peter Vorobieff.

J. Fluids Eng 138(3), 031203 (Oct 14, 2015) (7 pages) Paper No: FE-14-1095; doi: 10.1115/1.4031598 History: Received February 25, 2014; Revised September 05, 2015

The head-on collision process of elliptic vortex rings was experimentally investigated using flow-visualization technique as well as particle image velocimetry (PIV). Elliptic vortex rings were generated by the movement of a free moving elliptic piston–cylinder arrangement. It was found that the Q value is positive in the vortex core region while negative in the regions around the vortex core, which indicates the rotational effect is dominated in the vortex core and strain effect is dominated around the vortex core. When two elliptic vortex rings move toward each other, both rings slow down and expand in diameter direction until they merge and expand in diameter direction rapidly. The collision process of two elliptic vortex rings and the newly generated vortex structure after collision are dominated by the elliptic vortex ring with larger aspect ratio and the trajectories of vortex core almost coincide in different Reynolds numbers.

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Figures

Grahic Jump Location
Fig. 1

Schematic of the experiment facility

Grahic Jump Location
Fig. 2

Experiment apparatus of the visualization of vortex ring

Grahic Jump Location
Fig. 3

Evolution of flow field in the head-on collision process of two elliptic vortex rings: (a) vorticity and (b) Q value

Grahic Jump Location
Fig. 4

Comparison of the head-on collision process between different aspect ratios of elliptic piston (horizontal piston, Re = 5500): (a) left: λl = 1.5 and right: λr = 2.0 and (b) left: λl = 2.5 and right: λr = 2.0

Grahic Jump Location
Fig. 5

Comparison of the headvon collision process between different directions of the long axis of elliptic piston (Re = 11,000, left: λl = 1.5, right: λr = 2.0): (a) horizontal piston and (b) vertical piston

Grahic Jump Location
Fig. 6

Vortex core trajectories of two vortex rings in different cross sections (left ring: λl = 2.0, right ring: λr = 1.0): (a) horizontal piston and (b) vertical piston

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