A Two-dimensional Wake Numerical Simulation Method

A numerical simulation and tail flow technology, applied in data processing applications, electrical digital data processing, special data processing applications, etc., can solve problems such as complex forms, inefficient calculations, difficult coding, etc., to achieve simple forms, efficient calculations, and easy The effect of encoding

Active Publication Date: 2018-06-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] In order to solve the deficiencies of the existing technology, the purpose of the present invention is to provide a two-dimensional wake numerical simulation method to solve the problem that the existing technology cannot completely avoid the problems of low precision, complicated form, difficult coding and inefficient calculation in the process of wake calculation. technical problem

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  • A Two-dimensional Wake Numerical Simulation Method
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  • A Two-dimensional Wake Numerical Simulation Method

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Embodiment Construction

[0028] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0029] refer to Figure 8 As shown, the technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0030] 1. Calculate the wake expansion coefficient:

[0031] According to the hub height z of the wind turbine, the local surface roughness z 0 , to calculate the wake expansion coefficient k

[0032] k=0.5 / ln(H / z 0 ) (1)

[0033] When the surface roughness at the location of the pre-installed wind turbine is not known, we can use 0.075 for onshore wind turbines and 0.05 for offshore wind turbines according to the suggestion of Barthlmie et al.

[0034] 2. Park model

[0035] The Park model assumes that the wake expands linearly, the wind speed of the wake changes with the distance of the wind direction x, and the wind speed in the radial direction has a constant distribution....

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Abstract

The invention discloses a two-dimensional wake flow numerical simulation method. The method is characterized by comprising the steps that 1, wake flow expansion factors are calculated; 2, based on the step 1, the wake flow air speed under a Park model is calculated; 3, the initial wake flow radius under the Park model is corrected; 4, based on the step 2 and the step 3, the wake flow air speed under the corrected Park model is calculated; 5, based on the step 4, a new wake flow model is set up and named as a Park-Polynomial model; 6, the wake flow air speed under the Park-Polynomial model is calculated. By means of the two-dimensional wake flow numerical simulation method, the air speed of a wake flow zone can be well simulated, the precision is approximately consistent with testing results, the radial distribution better accords with a real flow field, and the advantages of a simple mode, easy encoding, efficient calculation and the like of an engineering model are achieved.

Description

technical field [0001] The invention relates to a two-dimensional wake numerical simulation method, in particular to a two-dimensional wake numerical simulation method based on a Park-Polynomial model. The invention belongs to the field of wind power generation. Background technique [0002] Wind turbines convert kinetic energy in the wind into mechanical energy in the main shaft, and finally into electrical energy in the generator. It is the wind turbine that continuously extracts dynamic energy from the airflow, which reduces the downstream wake wind speed, static pressure, and turbulence intensity. In the 1980s, scholars proposed two important wake models, the Park model and the eddy viscosity model. The form of the Park model is simple, the expansion of the wake area and the loss of wind speed are related to the wake attenuation constant, and the wind speed in the wake area has a constant distribution in the radial direction, which is inconsistent with the real situati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06Q50/06
Inventor 杨祥生赵宁田琳琳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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