Wind engineering wake flow calculation method

A calculation method and wind engineering technology, applied in calculations, special data processing applications, instruments, etc., can solve problems such as complex forms, inefficient calculations, and difficult encoding, and achieve the effect of simple forms, efficient calculations, and easy encoding

Active Publication Date: 2015-07-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a method for calculating the wake of wind engineering, thereby solving the proble

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  • Wind engineering wake flow calculation method

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[0028] Hereinafter, the present invention will be specifically introduced with reference to the drawings and specific embodiments.

[0029] Reference Figure 8 As shown, a new wind engineering wake calculation method of the present invention includes the following steps:

[0030] Step 1. Calculate the wake expansion coefficient k, considering the impact of surface roughness on the wake,

[0031] k=0.5 / ln(H / z 0 )

[0032] In the formula, H is the height of the hub, z 0 Is the surface roughness.

[0033] Step 2. Calculate the wake wind speed of the Park model. The Park model assumes that the wake is a linear expansion, the wake wind speed changes with the distance of the wind direction x, and the wind speed in the radial direction has a constant distribution.

[0034] u * = u 0 [ 1 - 2 a ( 1 + kx / r 0 ) 2 ]

[0035] Where u 0 Is the incoming wind speed, u * Is the wake wind speed at x from the roulette, r 0 Is the initial wake radi...

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Abstract

The invention discloses a wind engineering wake flow calculation method. The wind engineering wake flow calculation method is characterized by comprising the following steps of 1, calculating a wake flow expansion coefficient; 2, on the basis of the step 1, calculating the wind speed of wave flow under a Park model; 3, correcting the radius of the initial wave flow under the Park model; 4, on the basis of the steps 2 and 3, calculating the corrected Park model wave flow wind speed; 5, on the basis of the step 4, building a new wake flow model, and naming the new wake flow model as a Park-Gauss model; 6, calculating the wind speed of wake flow under the Park-Gauss model. The prediction precision of the wake flow is obviously improved through the corrected radius of the initial wake flow, the wind speed of the wake flow area can be well simulated, radial distribution better conforms to a real flow field while the precision is approximately consistent to that of a tested result, and meanwhile the wind engineering wake flow calculation method inherits the advantages of the simple form, easy encoding, efficient calculation and the like of an engineering model.

Description

technical field [0001] The invention relates to a calculation method, in particular to a wind engineering wake calculation method, and belongs to the field of wind power generation. Background technique [0002] As the shortage of non-renewable energy becomes increasingly acute, wind energy, which is sustainable and green and pollution-free in the future, will become one of the hot spots in the field of new energy. Wind farm site selection is an important task in the early stage of wind farm construction, and it plays an important role in later wind farm construction and benefit prediction. In the micro-site selection of large-scale wind farms, due to the limitations of current computing resources and capabilities, it will be very expensive to use the full CFD method to simulate and predict computing costs. In the field of wind power generation engineering, some engineering wake models with acceptable accuracy and simple form have strong practicability. Wake effects affect...

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Application Information

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IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 杨祥生赵宁田琳琳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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