A wind turbine rotor aerodynamic performance evaluation method based on a three-factor fitting integration method

Abstract

The invention relates to a wind turbine rotor aerodynamic performance evaluation method based on a three-factor fitting integration method. The method adopts a fitting mode to calculate the corresponding non-dimensional coefficients of the axial thrust, the torque and the power, and considers that the integrand function which is not considered in the traditional calculation method is discontinuousand can not be integrated strictly, and the parameters of each blade surface are different from each other and the deviation of the performance result calculated directly by the integration form is large. Compared with the traditional calculation model of wind turbine performance, the method is more scientific and accurate, and the processed result is more reliable.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for evaluating the aerodynamic performance of a wind turbine rotor based on a three-factor fitting integral method. Background technique [0002] At present, wind power is the most dynamic and fastest-growing clean energy industry in the current world ecological economy. With the rapid development of large-scale wind turbines, the development of off-grid small wind turbines is also booming, and it is particularly important to ensure that they have better economy and higher safety and stability. [0003] In recent years, small and medium-sized wind turbines have exposed some serious problems due to the failure of the speed regulation and direction adjustment systems (wind turbines without speed regulation devices are not uncommon in the market), and accidents or failures occur frequently: for example, when the wind speed is small, the wind wheel is often out...

AI Technical Summary

Problems solved by technology

[0003] In recent years, small and medium-sized wind turbines have exposed some serious problems due to the failure of the speed regulation and direction adjustment systems (wind turbines without speed regulation devices are not uncommon in the market), and accidents or failures occur frequently: for example, when the wind speed is low, the wind wheel is often out of alignment. The wind makes it difficult to turn the machine head; when the wind is strong (such as the wind speed exceeds 12m / s), the wind wheel cannot deflect in time to limit the speed, so that the wind wheel works for a long time in the state of over-speed rotation, resulting in deterioration of the working stability of the wind turbine. Far shorter than the design life, frequent fatigue damage accidents (such as generator burnout, wind turbine blade root damage and fracture, and small and medium-sized wind turbine tower down accidents caused by them) have brought huge losses to wind power generation work

For this reason, the analysis and performance evaluation of various parameters of the wind turbine began to be carried out. However, due to the inaccurate performance evaluation of the wind rotor under non-design conditions and the unscientific evaluation methods, the structural design and performance of the speed regulating mechanism Optimization work stalled

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