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Method for determining downburst wind profile of horizontal movement

A technology of horizontal movement and wind flow, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as incorrectly predicting wind speed in nonlinear wind fields

Active Publication Date: 2013-12-25
STATE GRID CORP OF CHINA +3
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Problems solved by technology

However, due to the strongly divided linear characteristics of the downburst flow, only the linear superposition method is used for velocity superposition, which will wrongly predict the wind speed in the nonlinear wind field

Method used

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  • Method for determining downburst wind profile of horizontal movement
  • Method for determining downburst wind profile of horizontal movement
  • Method for determining downburst wind profile of horizontal movement

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Embodiment Construction

[0061] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0062] Provided is a method for determining a horizontal motion downburst wind profile, the method comprising the following steps:

[0063] Step 1: Simulate the jet model of the downburst;

[0064] Step 2: Transform the jet model into a numerical calculation model;

[0065] Step 3: Determine the horizontal motion downburst wind profile.

[0066] In the step 1, based on computational fluid dynamics, the three-dimensional N-S equation is used to simulate the jet model of the horizontal motion downburst, and the three-dimensional N-S equation is closed by the RSM turbulence model. When using the jet flow model to simulate the downburst, the air flow is ejected from the nozzle to the ground at a certain speed, and after hitting the ground, it flows around. The flow diagram of the jet model is shown in figure 1 shown.

[0067] The three-dimensional N-S equati...

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Abstract

The invention provides a method for determining a downburst wind profile of a horizontal movement. The method comprises the following steps of 1, simulating a jet model of a downburst; 2, transforming the jet model into a numerical calculation model; and 3, determining the downburst wind profile of the horizontal movement. By the method, a wind speed computation formula of the downburst is put forward based on the simulation result of the full size computational fluid dynamics (CFD), and a theoretical reference is provided for engineering design. The method is simple in form, thorough in consideration factors, high in precision and efficient in computation.

Description

technical field [0001] The invention belongs to the technical field of line wind loads, and in particular relates to a method for determining a downburst wind profile in horizontal motion. Background technique [0002] A downburst is a strong wind formed after the rapid downdraft hits the ground violently in a thunderstorm. The horizontal wind speed of this strong wind increases rapidly with the height in the near-ground area, and reaches the peak speed (peak speed can reach 70m / s) at a relatively small height (20-100m), which affects the height of the strong wind. Buildings within the range, such as power transmission towers, are extremely destructive. For example, on June 14, 2005, the downburst caused the accident that the 5237 line of the 500kV line in Siyang, Jiangsu Province was transmitted to 10 transmission towers at one time; according to the analysis of the causes of the transmission tower collapse accident in the United States, Australia, South Africa and other c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 党会学杨风利杨靖波
Owner STATE GRID CORP OF CHINA
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