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Wind turbine vortex wake correction method

A technology of vortex wakes and wind turbines, which is applied in the direction of wind turbines, monitoring of wind turbines, engines, etc.

Inactive Publication Date: 2019-05-14
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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  • Description
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  • Application Information

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Problems solved by technology

In these models, the calculation of vortex wakes adopts a single vortex core model, and is represented by a fixed effective viscous diffusion factor. The method of wind turbine vortex wakes is too simplified

Method used

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  • Wind turbine vortex wake correction method

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Experimental program
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Embodiment

[0028] see figure 1 , a wind turbine vortex wake correction method, comprising the following steps:

[0029] S1: Obtain the number of wind turbine blades, the radius of the wind rotor, the speed of the wind rotor and the chord length of the blades;

[0030] S2: Determine the incoming wind speed and angle of attack of the wind turbine blades according to the wind speed, air density and air viscosity of the main wind direction where the wind turbine operates;

[0031] S3: Calculate the shape of the vortex wake. Around the initial wake angle, the Scully vortex model is used for the wake angle range of 30° to 320°; the Lamb-Oseen vortex model is used for the wake angle range before 30° and after 320°;

[0032] The formula for calculating the induced velocity of the vortex core model is:

[0033]

[0034] where r is the radius of the wind rotor, Γ is the vortex strength, r c is the radius of the vortex core corresponding to the maximum position of the circumferential induced ...

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Abstract

The invention relates to the technical field of wind turbine testing and discloses a wind turbine vortex wake correction method. The wind turbine vortex wake correction method comprises the steps thatby obtaining the number of wind turbine blades, the radius of a wind wheel, the rotating speed of the wind wheel and the chord length of the blades and according to the wind speed of the main wind direction, the air density and the air viscosity of the location where a wind turbine operates, the incoming flow wind speed and the attack angle of the wind turbine blades are determined, the shape ofa vortex wake is calculated, and according to a wake angle area, different vortex core models are used for describing a wake flow field more accurately and more reasonably; a Scully vortex model is adopted near an initial wake angle; a Lamb-Oseen vortex model is adopted within the forward and backward wake angle range; and different effective viscous diffusion factors are selected according to thewake angle area of the flow field. According to the difference of the time history of the wake flow field and spatial distribution, a wake flow model for general vortex wake calculating is corrected,and thus the vortex wake calculating result is more reasonable and more accurate.

Description

technical field [0001] The invention relates to the technical field of wind turbine testing, in particular to a wind turbine vortex wake correction method. 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] The free vortex wake method does not require prior data of the flow field, and the wake structure is obtained directly by solving the vortex line governing equations. It has a strong theoretical basis and is the most widely used of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D17/00
Inventor 武杰陈立肖京平王强史雨李国强金华王桥赵献礼
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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