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Method for simulating numerical value of wind power wake

A numerical method, wind blade technology, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of uncertainty in the stability of convergence and inability to further improve.

Inactive Publication Date: 2017-07-07
成都金景盛风科技有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0009] 2. The spatial discrete precision of the added vorticity is limited and cannot be further improved;
[0010] 3. The stability effect of the source term on the convergence of the numerical solution of the momentum equation is uncertain

Method used

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  • Method for simulating numerical value of wind power wake
  • Method for simulating numerical value of wind power wake
  • Method for simulating numerical value of wind power wake

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Embodiment Construction

[0070] The numerical simulation technology proposed by the present invention will be further described below with a specific embodiment. It can be implemented with Fortran90 computer high-level programming language, and run by computer to simulate the wake flow field of the three-dimensional rotating blade whose cross section is NACA0012 shape in the flight state of high angle of attack.

[0071] In a specific embodiment, the wind power generator adopts four rotating blades, and the blade span ratio is 7. Such as image 3 As shown, the profile is the 3D blade and computational domain of NACA0012. The computational domain takes a quarter quadrant, contains a blade, and the Z-axis is the axis of rotation. The calculation grid adopts multi-block structured hexahedral grid. According to the characteristics of the wind blade flow field, the calculation domain is divided into five blocks: far field (1), wake (2), and near field (3). O-shaped grids are used around the wing, with ...

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Abstract

The invention discloses a method for simulating a numerical value of a wind power wake. According to the characteristics of icompressible flows, in a momentum equation, two different forms of force are added to improve the numerical value simulation accuracy of one class of flow field which gives priority to vortex movement. The two forms of force are respectively the spiral force of vorticity in a varying gradient direction and the viscous dissipation force of the vorticity in the varying gradient direction. By use of the method, the integral computation of the spiral force of the vorticity in the varying gradient direction in a computational grid is converted into the flux computation of the force on the boundary of the computational grid, and meanwhile, the source item of the momentum equation keeps the viscous dissipation force of the vorticity in the varying gradient direction.

Description

technical field [0001] The invention relates to a numerical method in the application field of computational fluid dynamics, in particular to a numerical method for simulating the wake of wind blades. Background technique [0002] Large wind turbines are already widely used. The mastery of the movement regularity of the flow field around the wind blade plays an important role in the design of the wind blade. An important flow characteristic is the swirling flow around the blades. Such as figure 1 As shown, the wake flow field of the wind blade includes two types of vortex-dominated flows. One is the tip vortex generated at the tip of the blade in the span direction, that is, the tip of the wing; the other is the shedding vortex generated on the surface of the blade. The formation of wingtip vortex is due to the difference in pressure on the upper and lower surfaces of the rotor, which will cause the airflow under the rotor to flow around the wingtip to the top of the win...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 路明
Owner 成都金景盛风科技有限公司
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