Predicating method for wind turbine blade airfoil fluttering

A technology of blade airfoil and prediction method, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of avoiding blade flutter, avoiding hazards and consequences

Inactive Publication Date: 2014-05-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the result obtained by the eigenvalue criterion method is only the approximate interval of blade flutter. To obtain the exact interval of blade flutter occurrence, as well as the specific amplitude and change of flutter within this interval, only the eigenvalue

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  • Predicating method for wind turbine blade airfoil fluttering
  • Predicating method for wind turbine blade airfoil fluttering
  • Predicating method for wind turbine blade airfoil fluttering

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[0033] The process of predicting the flutter interval of the blade airfoil is mainly divided into two parts: first predict the flutter interval by the eigenvalue method, and then directly use the flutter interval obtained by the eigenvalue method as the tip speed of the time domain analysis method. The ratio range is used to guide the time-domain analysis method to analyze the flutter in detail and determine the intensity of the flutter. The eigenvalue method of wind turbine blade flutter is combined with the time domain analysis method to realize the judgment of the flutter region and the degree of flutter of the blade. Specific steps are as follows:

[0034] First, use the eigenvalue method to initially predict the flutter interval:

[0035] 1) Select airfoil and determine various structural parameters of the blade;

[0036] 2) Establish the aeroelastic equation of the two-dimensional blade airfoil;

[0037] 3) Find the aerodynamic force and aerodynamic moment in the aeroelastic e...

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Abstract

The invention relates to a predicating method for wind turbine blade airfoil fluttering. Fluttering intervals are firstly predicated through a characteristic value method, according to the fluttering intervals which are obtained according to the characteristic value method, detailed solving is performed at the critical tip speed ratio or nearby the position where changes are violent, other tip speed ratios can be selected according to needs and do not need to be selected according to step lengths, the blindness of a time domain analysis method can be obviously reduced, in this way, through adjusting the tip speed ratios, divergence and convergence conditions of various pneumatic responses can be observed, the fluttering intervals which can be obtained are adjusted, and meanwhile the violent degree of fluttering is judged. Fluttering section results obtained through the two methods can be mutually verified and supported, wind turbine blades are promoted to operate safely and stably, blade fluttering is prevented from occurring, and therefore all kinds of risks and results are avoided.

Description

technical field [0001] The invention relates to a flutter prediction technology, in particular to a method for predicting the flutter of a blade airfoil of a wind power generator. Background technique [0002] In recent years, the situation of the energy crisis has become increasingly serious, and has been gradually paid attention to. As a representative of clean energy and renewable energy, wind energy has been developing rapidly around the world, and its proportion in the world's energy is also increasing. As one of the key components, the size of wind turbine blades is getting larger and larger, and the blade length has reached about 100 meters at present. For such large-scale wind turbine blades, a coupling effect occurs between the air and the elastic structure, which belongs to the category of aeroelasticity. Under the action of aeroelasticity, the blade part of the wind turbine is prone to aeroelastic instability, that is, flutter. The flutter phenomenon originated...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王昊马冰李帅斌丁娇娇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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