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A pre-bending and pre-twisting design method for a flexible blade of a wind turbine based on an aeroelastic model

An aeroelastic model, wind turbine technology, applied to wind turbines, wind turbines, mechanical equipment and other directions that are consistent with the wind direction, can solve the problem that the output power of the wind turbine deviates from the original design value, affects the aerodynamic performance of the wind turbine, and affects the wind turbine. Pneumatic efficiency and other issues, to ensure accuracy and fast results

Active Publication Date: 2019-06-18
SHANGHAI JIAO TONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0003] On the other hand, the flexible blades of a wind turbine are usually accompanied by bending and torsional aeroelastic deformation during operation. If this deformation is too large, it will affect the aerodynamic performance of the wind rotor, causing the output power of the wind rotor to deviate from the original design value, affecting the wind turbine. aerodynamic efficiency

Method used

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  • A pre-bending and pre-twisting design method for a flexible blade of a wind turbine based on an aeroelastic model
  • A pre-bending and pre-twisting design method for a flexible blade of a wind turbine based on an aeroelastic model
  • A pre-bending and pre-twisting design method for a flexible blade of a wind turbine based on an aeroelastic model

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Embodiment 1

[0039] see figure 1 , in one embodiment, a kind of wind turbine flexible blade pre-bending and pre-torsion design method based on aeroelastic model, the method includes the following steps:

[0040] S1: The target aerodynamic shape of the given blade and the basic parameters of the wind turbine:

[0041] Based on the aerodynamic design, the desired aerodynamic shape of the given blade is taken as the design target, which mainly refers to the distribution law of the chord length, torsion angle and swept three-dimensional shape of the blade along the span; the distribution of the torsion angle is The sweep shape is The subscript i=1, 2, ..., N represents the radial position of the corresponding blade segment; at the same time, the equivalent section stiffness of the blade and the working conditions of the rotor, such as rated wind speed, rotational speed, pitch angle and other basic parameters are given.

[0042] S2: Establish the aeroelastic time domain model of the wind tu...

Embodiment 2

[0057] The design of the pre-bending and pre-torsion of the flexible blade of the wind turbine will be further described in detail below with reference to an example.

[0058] see figure 2 , step 1, given the target aerodynamic shape of the blade and the basic parameters of the wind turbine:

[0059] The swept-back blade has the structural characteristics of bending and torsion coupling, and the torsional deformation will be accompanied by the bending deformation under the action of aerodynamic thrust. Using this coupling feature, the swept blade is used to passively reduce the load fluctuation amplitude of the unsteady load, which can effectively reduce the fatigue load of the blade in unsteady conditions such as turbulence, wind shear, and yaw. In this example, a swept-back blade modified from the NREL5-MW blade with a length of 61.5 m is used as the design target. The wind turbine parameters that need to be given are as follows:

[0060] 1) Swept back shape represente...

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Abstract

The invention discloses a pre-bending and pre-twisting design method for a flexible blade of a wind turbine based on an aeroelastic model. The method comprises the following steps: S1, giving a targetaerodynamic shape of the blade and basic parameters of the wind turbine; S2, establishing an aeroelasticity time domain model of the wind turbine blade; S3, calculating the aeroelastic deformation ofthe original blade; S4, estimating the pre-bending and pre-twisting shapes of the blade; And S5, calculating the aeroelastic deformation of the blade after pre-bending and pre-twisting, and judging whether to converge or not. An aeroelastic model aeroelastic model is established by adopting a nonlinear beam theory and a lifting surface method based on a potential flow theory; the accuracy and thespeed of model calculation in the iteration process are ensured; According to the method, the pre-bending and pre-twisting geometric shape of the blade can be efficiently obtained, and the deformation of the blade at all radius positions is taken into the convergence judgment standard, so that the target aerodynamic shape can be achieved within the whole blade extension range after the flexible blade generates aeroelastic deformation, and the flexible blade can work in the optimal state.

Description

technical field [0001] The invention belongs to the field of horizontal axis wind turbine power generation, and in particular relates to a design method for pre-bending and pre-torsion of a flexible blade of a wind turbine based on an aeroelastic model. Background technique [0002] The aerodynamic shape of the wind turbine blade determines the output power and aerodynamic efficiency of the unit, and is a very critical design element in the design of wind turbines. In the design of the model, the aerodynamic parameters such as the chord length, twist angle, twist angle and sweep shape of the blade are usually carefully calculated to ensure that the unit is in the best or near-optimal work under the designed conditions. state. In addition, the researchers also proposed various optimization algorithms to further optimize the geometric shape of the blade to achieve various optimizations such as improving the annual average power generation of the wind rotor, improving the star...

Claims

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Application Information

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IPC IPC(8): G06F17/50F03D1/06
CPCY02E10/72
Inventor 陈进格沈昕竺晓程杜朝辉
Owner SHANGHAI JIAO TONG UNIV
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