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Research Papers: Alternative Energy Sources

Calculation of the Water Droplets Local Collection Efficiency on the Wind Turbines Blade

[+] Author and Article Information
Liangquan Hu

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

Xiaocheng Zhu

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

Chenxing Hu

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

Jinge Chen

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

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 November 7, 2016; final manuscript received February 27, 2017; published online April 6, 2017. Assoc. Editor: Bengt Sunden.

J. Energy Resour. Technol 139(5), 051211 (Apr 06, 2017) (9 pages) Paper No: JERT-16-1448; doi: 10.1115/1.4036329 History: Received November 07, 2016; Revised February 27, 2017

Wind turbines operating in cold climate are susceptible to icing events. In order to gain a better understanding of the blade icing, the water droplets local collection efficiency affected by different factors was investigated. First, the water droplets conservation equations which are based on the fluent user-defined scalar (UDS) were introduced. Second, the Eulerian method was validated. Two test cases indicate that the developed method is effective. Then, the local collection efficiency on the S809 airfoil was studied. Results show that as the angle of attack (AOA) increases, the water droplets impingement region moves toward the airfoil lower surface and the maximum local collection efficiency decreases. The local collection efficiency and the impingement region increase with the water droplets diameter and the air flow velocity but decrease with the airfoil chord length. Finally, the local collection efficiency affected by the three-dimensional (3D) effect was studied. Results show that the maximum local collection efficiency in the blade tip region decreases up to 96.29% due to the 3D effect.

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References

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Figures

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Fig. 1

Define boundary condition for the water droplets volume fraction on the geometry surface

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Fig. 2

Steps to calculate the local collection efficiency

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Fig. 3

Grids independent analysis for the NACA0012 airfoil

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Fig. 4

Discretized domain for the cylinder: (a) global grids for the cylinder and (b) local grids for the cylinder

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Fig. 5

Discretized domain for the NACA0012 airfoil: (a) global grids for the NACA0012 airfoil and (b) local grids for the NACA0012 airfoil

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Fig. 6

Contour of the water droplets volume fraction for the cylinder

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Fig. 7

Contour of the water droplets volume fraction for the NACA0012 airfoil

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Fig. 8

Comparison of the local collection efficiencies for the cylinder

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Fig. 9

Comparison of the local collection efficiencies for the NACA0012 airfoil

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Fig. 10

Discretized domain for the S809 airfoil: (a) global grids for the S809 airfoil and (b) local grids for the S809 airfoil

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Fig. 11

Contour of the water droplets volume fraction for the S809 airfoil at AOA =  0 deg

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Fig. 12

Contour of the water droplets volume fraction for the S809 airfoil at AOA =  4  deg

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Fig. 13

Contour of the water droplets volume fraction for the S809 airfoil at AOA =  8deg

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Fig. 14

Contour of the water droplets volume fraction for the S809 airfoil at AOA =  12 deg

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Fig. 15

Local collection efficiency for the S809 airfoil at AOA =  0 deg

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Fig. 16

Local collection efficiency for the S809 airfoil at AOA =  4  deg

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Fig. 17

Local collection efficiency for the S809 airfoil at AOA =  8 deg

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Fig. 18

Local collection efficiency for the S809 airfoil at AOA =  12  deg

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Fig. 19

Local collection efficiency affected by the water droplets diameter

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Fig. 20

Local collection efficiency affected by the air flow velocity

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Fig. 21

Local collection efficiency affected by the airfoil chord length

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Fig. 22

Discretized domain for the 3D S809 straight blade: (a) global grids for the 3D S809 straight blade and (b) surface grids for the 3D S809 straight blade

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Fig. 23

Contour of the water droplets local collection efficiency for the 3D S809 straight blade

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Fig. 24

Water droplets local collection efficiency distribution in the blade tip region

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