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Research Papers: Flows in Complex Systems

Oval Flow Mode Between Two Corotating Disks With Stationary Shroud

[+] Author and Article Information
Ching Min Hsu, Jia-Kun Chen

Graduate Institute of Applied
Science and Technology,
National Taiwan University of
Science and Technology,
Taipei, Taiwan 10672, China

Min Kai Hsieh

System Development Center,
Chung-Shan Institute of
Science and Technology,
Taoyuan, Taiwan 32546, China

Rong Fung Huang

Professor
Department of Mechanical Engineering,
National Taiwan University of
Science and Technology,
43 Keelung Road,
Section 4,
Taipei, Taiwan 10672, China
e-mail: rfhuang@mail.ntust.edu.tw

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received December 17, 2012; final manuscript received September 29, 2014; published online November 6, 2014. Assoc. Editor: Peter Vorobieff.

J. Fluids Eng 137(3), 031104 (Nov 06, 2014) (12 pages) Paper No: FE-12-1634; doi: 10.1115/1.4028729 History: Received December 17, 2012; Revised September 29, 2014

The characteristic flow behavior, time-averaged velocity distributions, phase-resolved ensemble-averaged velocity profiles, and turbulence properties of the flow in the interdisk midplane between shrouded two corotating disks at the interdisk spacing to disk radius aspect ratio 0.2 and rotation Reynolds number 3.01 × 105 were experimentally studied by flow visualization method and particle image velocimetry (PIV). An oval core flow structure rotating at a frequency 60% of the disks rotating frequency was observed. Based on the analysis of relative velocities, the flow in the region outside the oval core flow structure consisted of two large vortex rings, which move circumferentially with the rotation motion of the oval flow core. Four characteristic flow regions—solid-body-rotation-like region, buffer region, vortex region, and shroud-influenced region—were identified in the flow field. The solid-body-rotation-like region, which was featured by its linear distribution of circumferential velocity and negligibly small radial velocity, was located within the inscribing radius of the oval flow core. The vortex region was located outside the circumscribing radius of the oval flow core. The buffer region existed between the solid-body-rotation-like region and the vortex region. In the buffer region, there existed a “node” point that the propagating circumferential velocity waves diminished. The circumferential random fluctuation intensity presented minimum values at the node point and high values in the solid-body-rotation-like region and shroud-influenced region due to the shear effect induced by the wall.

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References

Figures

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Fig. 1

Arrangement of experiment setup

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Fig. 2

Time evolution of oval flow core rotation. S = 0.2 and Re = 3.01 × 105.

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Fig. 3

Nondimensional inscribing and circumscribing radii of oval flow core

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Fig. 4

Time evolution of streamline patterns in interdisk midplane based on relative velocities. S = 0.2 and Re = 23.01 × 105.

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Fig. 5

Instantaneous velocities at various radial locations R* in interdisk midplane. S = 0.2 and Re = 3.01 × 105. (a)–(d) Circumferential component and (e)–(h) radial component.

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Fig. 6

Power spectrum density function of fluctuation velocities at various R*. S = 0.2 and Re = 3.01 × 105.

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Fig. 7

Time-averaged velocity distributions along R* in interdisk midplane. S = 0.2 and Re = 3.01 × 105. (a) Circumferential component and (b) radial component.

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Fig. 8

Ensemble-averaged velocity distributions in interdisk midplane. S = 0.2. (a) Circumferential component and (b) radial component.

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Fig. 9

Periodic oscillation velocities at various R* in interdisk midplane. S = 0.2 and Re = 3.01 × 105. (a)–(d) Circumferential component and (e)–(h) radial component.

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Fig. 10

Velocity fluctuation intensities along R*. S = 0.2 and Re = 3.01 × 105. (a) Circumferential component of periodic oscillation intensity, (b) circumferential component of turbulent fluctuation intensity, (c) radial component of periodic oscillation intensity, and (d) radial component of turbulent fluctuation intensity.

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Fig. 11

Autocorrelation coefficients. S = 0.2 and Re = 3.01 × 105. (a) and (b) Circumferential fluctuation and (c) and (d) radial fluctuation.

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Fig. 12

Lagrangian integral scales of turbulence fluctuation velocities along R* in interdisk midplane. S = 0.2 and Re = 3.01 × 105. (a) Time scale of circumferential component, (b) length scale of circumferential component, (c) time scale of radial component, and (d) length scale of radial component.

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