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Research Papers: Flows in Complex Systems

Numerical Investigation Into the Effects of Motion Parameters on Energy Extraction of the Parallel Foils

[+] Author and Article Information
Y. L. Wang

Shaanxi Engineering Laboratory of
Turbomachinery and Power Equipment,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, Shaanxi Province, China
e-mail: wangyulu@stu.xjtu.edu.cn

W. Jiang

Shaanxi Engineering Laboratory of
Turbomachinery and Power Equipment,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, Shaanxi Province, China
e-mail: jiangwei@stu.xjtu.edu.cn

Y. H. Xie

Shaanxi Engineering Laboratory of
Turbomachinery and Power Equipment,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an 710049, Shaanxi Province, China
e-mail: yhxie@mail.xjtu.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 3, 2018; final manuscript received October 22, 2018; published online December 12, 2018. Assoc. Editor: Praveen Ramaprabhu.

J. Fluids Eng 141(6), 061104 (Dec 12, 2018) (12 pages) Paper No: FE-18-1010; doi: 10.1115/1.4041814 History: Received January 03, 2018; Revised October 22, 2018

Due to the deficiency of the research on parallel foils, the parallel configuration of foils is concerned and the effects of motion parameters on energy extraction are systematically discussed in the present study. The foils undergo combined plunging and pitching motions. The effects of motion parameters (pitching amplitude, plunging amplitude, reduced frequency, and spacing between foils) in wide range are investigated at Re = 1100 through two-dimensional (2D) unsteady laminar flow simulations. The features of power output and efficiency changing with these motion parameters as well as the evolution of the vortex fields are gained. The principle that how motion parameters affecting energy extraction performance is studied. The extraction performance of parallel foils and single foil is compared at the optimal working parameters of the single foil. Numerical results indicate the optimal extraction performance of the parallel foils is superior to that of the single foil. CPm improves by 6.87% relatively. Therefore, it reveals that the parallel foils can perform the better extraction characteristics than the single foil by controlling parameters.

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Figures

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Fig. 1

Sketch map of parallel dual foil configuration

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Fig. 2

Sketch map of parallel-foil oscillation process: (a) t/T = 0–0.5 and (b) t/T = 0.5–1

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Fig. 3

Sketch map of the computational domain and boundary conditions

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Fig. 4

Mesh of computational domain

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Fig. 5

Variations of Cd and CP with different time steps and grid numbers

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Fig. 6

Variation of CP of the single foil at Re = 1100, k = 0.88, H0 = 1, θ0 = 76.3 deg

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Fig. 7

Variation of CTm of the single foil at Re = 2 × 104 and H0 = 0.175

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Fig. 8

Variation of CPm and η with reduced frequency at different θ0

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Fig. 9

Variation of CPhm and CPθm with reduced frequency at different θ0

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Fig. 10

Variation of the upper foil's Cl at k = 0.7, k = 0.9 and k = 1.2 with different θ0: (a) k = 0.7, (b) k = 0.9, and (c) k = 1.2

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Fig. 11

Evolution of the vortex fields at t/T = 0–0.5 with different conditions: (a) k = 0.9, θ0 = 70 deg, (b) k = 0.9, θ0 = 80 deg, (c) k = 0.9, θ0 = 90 deg, and (d) k = 0.8, θ0 = 80 deg

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Fig. 12

Variation of CPm and η with reduced frequency at different H0

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Fig. 13

Variation of CPhm and CPθm with reduced frequency at different H0

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Fig. 14

Variation of CPm and η of the optimal single foil group and parallel foils at different δ0

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Fig. 15

Variation of CP of parallel foils with k = 0.9 at different δ0

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Fig. 16

Variation of CPh and C of parallel foils with k = 0.9 at δ0=2.0 and δ0=2.2

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Fig. 17

Evolution of the vortex fields at t/T = 0.45, k = 0.9 with different δ0

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Fig. 18

Variation of Cl of the single foil and the upper foil of parallel foils at k = 0.9 with different δ0

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Fig. 19

Vortex fields of single foil and parallel foils with different δ0 at t/T = 0.05, k = 0.9

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