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Applied Mathematics and Mechanics (English Edition) ›› 2018, Vol. 39 ›› Issue (5): 639-652.doi: https://doi.org/10.1007/s10483-018-2267-6

• 论文 • 上一篇    下一篇

Effects of the particle Stokes number on wind turbine airfoil erosion

Deshun LI1,2,3, Zhenxi ZHAO1,2, Yinran LI1,2,3, Qing WANG1,2,3, Rennian LI1,2,3, Ye LI4   

  1. 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    2. Gansu Provincial Technology Centre for Wind Turbines, Lanzhou 730050, China;
    3. Gansu Provincial Key Laboratory of Fluid Machinery and Systems, Lanzhou 730050, China;
    4. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil, Shanghai Jiao Tong University, Shanghai 200240, China
  • 收稿日期:2018-03-26 修回日期:2018-04-07 出版日期:2018-05-01 发布日期:2018-05-01
  • 通讯作者: Deshun LI,E-mail:lideshun 8510@sina.com E-mail:lideshun 8510@sina.com
  • 基金资助:

    Project supported by the National Basic Research Program of China (No. 2014CB046201) and the National Natural Science Foundation of China (Nos. 51766009 and 51566011)

Effects of the particle Stokes number on wind turbine airfoil erosion

Deshun LI1,2,3, Zhenxi ZHAO1,2, Yinran LI1,2,3, Qing WANG1,2,3, Rennian LI1,2,3, Ye LI4   

  1. 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    2. Gansu Provincial Technology Centre for Wind Turbines, Lanzhou 730050, China;
    3. Gansu Provincial Key Laboratory of Fluid Machinery and Systems, Lanzhou 730050, China;
    4. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2018-03-26 Revised:2018-04-07 Online:2018-05-01 Published:2018-05-01
  • Contact: Deshun LI E-mail:lideshun 8510@sina.com
  • Supported by:

    Project supported by the National Basic Research Program of China (No. 2014CB046201) and the National Natural Science Foundation of China (Nos. 51766009 and 51566011)

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摘要：

Under natural conditions, wind turbines are inevitably eroded by the action of sand-wind flow. To further investigate the effects of dust drift on the erosion of the wind turbine blades in sand-wind environments, the effects of the wind velocity, particle diameter, and particle density on the erosion of wind turbine airfoils are studied, and the effects of the particle Stokes number on the airfoil erosion are discussed. The results show that, when the angle of attack (AOA) is 6.1°, there will be no erosion on the airfoil surface if the particle Stokes number is lower than 0.013 5, whereas erosion will occur if the particle Stokes number is higher than 0.015 1. Therefore, there exists a critical range for the particle Stokes number. When the particle Stokes number is higher than the maximum value in the critical range, airfoil erosion will occur. The result is further confirmed by changing the particle diameter, particle density, and inflow speed. It is shown that the erosion area on the airfoil and the maximum erosion rate are almost equal under the same particle Stokes number and AOA. The extent of airfoil erosion increases when the particle Stokes number increases, and the critical particle Stokes number increases when the AOA increases. Moreover, the geometric shape of the airfoil pressure surface greatly affects the airfoil erosion, especially at the curvature near the leading edge.

关键词: sand-wind environment, Stokes number, erosion, artificial mechanical valve, ALE finite element method, fluidsolid interaction, airfoil, wind turbine

Abstract:

Under natural conditions, wind turbines are inevitably eroded by the action of sand-wind flow. To further investigate the effects of dust drift on the erosion of the wind turbine blades in sand-wind environments, the effects of the wind velocity, particle diameter, and particle density on the erosion of wind turbine airfoils are studied, and the effects of the particle Stokes number on the airfoil erosion are discussed. The results show that, when the angle of attack (AOA) is 6.1°, there will be no erosion on the airfoil surface if the particle Stokes number is lower than 0.013 5, whereas erosion will occur if the particle Stokes number is higher than 0.015 1. Therefore, there exists a critical range for the particle Stokes number. When the particle Stokes number is higher than the maximum value in the critical range, airfoil erosion will occur. The result is further confirmed by changing the particle diameter, particle density, and inflow speed. It is shown that the erosion area on the airfoil and the maximum erosion rate are almost equal under the same particle Stokes number and AOA. The extent of airfoil erosion increases when the particle Stokes number increases, and the critical particle Stokes number increases when the AOA increases. Moreover, the geometric shape of the airfoil pressure surface greatly affects the airfoil erosion, especially at the curvature near the leading edge.

Key words: erosion, artificial mechanical valve, ALE finite element method, fluidsolid interaction, wind turbine, Stokes number, airfoil, sand-wind environment

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