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Research Papers: Alternative Energy Sources

Calculation of Collection Efficiency on NREL Phase VI Blade

[+] Author and Article Information
Xiaocheng Zhu

School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: zhxc@sjtu.edu.cn

Liangquan Hu

School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: liangquanhu@sina.com

Jinge Chen

School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: jingechen@126.com

Xin Shen

School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: shenxin@sjtu.edu.cn

Zhaohui Du

School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: zhdu@sjtu.edu.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 26, 2017; final manuscript received February 8, 2018; published online March 15, 2018. Assoc. Editor: Ryo Amano.

J. Energy Resour. Technol 140(7), 071202 (Mar 15, 2018) (9 pages) Paper No: JERT-17-1460; doi: 10.1115/1.4039349 History: Received August 26, 2017; Revised February 08, 2018

Icing on wind turbines is a major problem in cold regions. To study blade icing, water droplet collection efficiency is calculated on the National Renewable Energy Laboratory (NREL) phase VI blade. First, water droplet conservation equations are embedded into ANSYS Fluent, and the results calculated by the Eulerian method are validated. For the two-dimensional (2D) airfoil, the peak collection efficiency error is 3.7%; for the three-dimensional (3D) blade, the peak collection efficiency error is 2.8%. Second, collection efficiency on the NREL phase VI blade is investigated. The results indicate that water droplets mainly impact on the blade leading edge, and the collection efficiency increases along the radial direction. Finally, the 3D rotating effect on collection efficiency is studied. The results demonstrate that, at a wind speed of 7 m/s, the 3D rotating effect has almost no influence on collection efficiency; however, the effect must be considered in water droplet collection at a wind speed of 10 m/s.

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Figures

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Fig. 1

Procedures for calculating collection efficiency

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Fig. 2

Grid-independent analysis for NACA23012 airfoil

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Fig. 3

Discrete domain for NACA23012 airfoil: (a) global grids and (b) local grids

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Fig. 4

Water droplet volume fractions for NACA23012 airfoil

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Fig. 5

Comparison of collection efficiencies for NACA23012 airfoil

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Fig. 6

Comparison of collection efficiencies for NACA13106 blade

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Fig. 7

Discrete domain for NREL phase VI blade: (a) global grids and (b) blade surface grids

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Fig. 8

Pressure coefficient distributions at a wind speed of 7 m/s: (a) r/R = 30% (b) r/R = 46.7% (c) r/R = 63.3% (d) r/R = 80% (e) r/R = 95%

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Fig. 9

Collection efficiency on NREL phase VI blade: (a) suction surface, (b) leading edge, and (c) pressure surface

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Fig. 10

Collection efficiency distributions

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Fig. 11

Limiting streamlines at blade suction surface: (a) wind speed of 7 m/s and (b) wind speed of 10 m/s

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Fig. 12

Comparison of collection efficiencies at a wind speed of 7 m/s: (a) r/R = 30%, (b) r/R = 46.7%, (c) r/R = 63.3%, (d) r/R = 80%, and (e) r/R = 95%

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Fig. 13

Comparison of collection efficiencies at a wind speed of 10 m/s (a) r/R = 30%, (b) r/R = 46.7%, (c) r/R = 63.3%, (d) r/R = 80%, and (e) r/R = 95%

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