Three-step three-order pre-estimation correcting method for wind wheel vortex line control equation discretion

A technology of control equations and correction methods, applied in the control of wind turbines, wind power generation, wind turbines, etc., can solve problems such as low precision and poor iteration stability, reduce calculation time, improve calculation accuracy, and improve iteration stability and the effect of iteration speed

Inactive Publication Date: 2015-08-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a three-step three-order predictive correction method for the discretization of the control equation of the wind

Method used

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  • Three-step three-order pre-estimation correcting method for wind wheel vortex line control equation discretion
  • Three-step three-order pre-estimation correcting method for wind wheel vortex line control equation discretion
  • Three-step three-order pre-estimation correcting method for wind wheel vortex line control equation discretion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: The number of wind turbine blades is 3, the diameter of the wind rotor is 10.058 meters, the chord length of the blades is 0.457 meters, the blade airfoil is S809 airfoil, the calculated wind speed is 13 m / s, and the calculated speed is 72 rpm.

[0051]The blades of Example 1 are replaced by attached vortex lines placed at 1 / 4 of the chord length, and are discretized into a series of straight vortex line segments, and the amount of attached vortex rings in each segment is determined by the aerodynamic characteristics of the corresponding blade elements. The spatial and temporal changes of the attached circulation are simulated by trailing vortex and detached vortex, respectively, and dragged out from the attached vortex line nodes. The wake vortex line nodes move freely under the action of the local flow field. The length of the wind rotor wake is twice the diameter of the wind rotor, and it is composed of near wake and far wake. The far wake of vortices....

Embodiment 2

[0062] Embodiment 2: The number of wind turbine blades is 2, the diameter of the wind rotor is 0.46 meters, the chord length of the blades is 0.04 meters, the blade airfoil is S3024 airfoil, the calculated wind speed is 8 m / s, and the calculated rotating speed is 360-1800 rpm .

[0063] The attached vortex line placed at 1 / 4 of the chord length is used to replace the blade of Example 2, and it is discretized into a series of straight vortex line segments, and the amount of attached vortex rings in each segment is determined by the aerodynamic characteristics of the corresponding blade element. The spatial and temporal changes of the attached circulation are simulated by trailing vortex and detached vortex, respectively, and dragged out from the attached vortex line nodes. The wake vortex line nodes move freely under the action of the local flow field. The length of the wind rotor wake is twice the diameter of the wind rotor, and it is composed of near wake and far wake. The ...

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Abstract

The invention discloses a three-step three-order pre-estimation correcting method for wind wheel vortex line control equation discretion. According to the method, when a vortex convection control equation is solved according to a free vortex back track method, a linear display three-step method is adopted for a time step differential for pre-estimation, an implicit linear three-step method is used as a corrector step, a three-step pre-estimation correcting differential format for solving a vortex line control equation is formed, and three-order precision is obtained. By the adoption of the method, iteration stability and iteration speed are improved when the non-constant aerodynamic characteristic of a wind turbine is calculated according to the free vortex back trace method, the calculation time is greatly shortened, and the calculation accuracy can be improved.

Description

technical field [0001] The invention relates to a three-step and third-order prediction and correction method for discrete control equations of a wind turbine vortex, belonging to the technical field of wind turbines. Background technique [0002] There are three main methods for calculating the aerodynamic characteristics of wind turbines: blade element momentum theory, vortex wake method, and computational fluid dynamics method. Considering the accuracy and calculation cost of the method, the vortex wake method has more advantages, and it has vortex characteristics in essence, which can more accurately take into account the interaction induction between wake vortices in the wake field, and is a more flexible method for simulating the aerodynamic characteristics of wind turbines. Numeric tools. [0003] In the free vortex wake method, the key technology is the discretization scheme of the vortex line governing equations, which can be divided into relaxation iteration and t...

Claims

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Application Information

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IPC IPC(8): F03D7/00
CPCY02E10/72
Inventor 许波峰袁越赵振宙
Owner HOHAI UNIV
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