Transactions of Nanjing University of Aeronautics & Astronautics
Special Issue for Wind Turbine
Validation of critical Stokes number of wind turbine airfoil gas-solid two-phase flow erosion
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Abstract:
It is well known that wind turbine blades will be eroded in wind-sand environment, so it is crucial to confirm what operating condition the erosion will occur in. In this paper, the effect of sand diameter on the wind turbine airfoil erosion is studied firstly. It is found that the sands bypass the airfoil and no erosion appears on it when the sand diameter is less than 3μm, and the sands impact on the airfoil and the erosion occurs when the sand diameter is greater than 4μm. So there is a critical sand diameter between 3μm and 4μm that just causes erosion of the airfoil. In order to find out the critical value, the particle Stokes number is introduced into discussion as an important non-dimensional parameter describing two-phase flow. According to the critical sand diameter above, it can be assumed that there is a critical value of particle Stokes number between 0.0078 and 0.014 to judge whether erosion will occur on wind turbine airfoil. And then, some other factors are taken into account to validate the assumption, such as angle of attack, relative thickness of the airfoil, different series airfoil, and inflow velocity, it is confirmed to be correct
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CHINA AERO-SCIENCES
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