Simulation method for large-scale cooling tower wind tunnel test

A technology of wind tunnel test and simulation method, which is applied in the direction of aerodynamic test, machine/structural component test, measuring device, etc. It can solve the problem that it is not easy to control the size and uniformity of roughness, the roughness value is not given, the surface Problems such as uneven roughness can achieve the effect of avoiding deviation, eliminating uncertain values ​​and saving time

Inactive Publication Date: 2017-05-10
SHIJIAZHUANG TIEDAO UNIV
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  • Abstract
  • Description
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Problems solved by technology

The grinding method is not easy to control the size and uniformity of the roughness. Sticking the paper tape will cause the surface roughness of the whole tower to be different, and the exact roughness value is not given.

Method used

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  • Simulation method for large-scale cooling tower wind tunnel test
  • Simulation method for large-scale cooling tower wind tunnel test

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be described in further detail: as figure 1 , figure 2 A simulation method for a large-scale cooling tower wind tunnel test shown, including the following steps:

[0021] (1) Make a test model of the cooling tower with a scale ratio of 1:150;

[0022] (2) Select different kinds of wallpapers and paste them on the throat of the cooling tower model respectively. The wallpapers are evenly and flatly pasted on the surface of the test model. The roughness caused by one type of wallpaper to the throat of the cooling tower model, the throat model test is carried out for each type of wallpaper, and the pressure coefficient of the throat of the cooling tower is collected; the roughness is expressed by "the arithmetic mean deviation Ra of the contour" and Two parameters of "contour root mean square deviation Rq", where,, where: L is the sampling length in the roughness profile gr...

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Abstract

The invention discloses a simulation method for a large-scale cooling tower wind tunnel test, and relates to the technical field of wind tunnel test simulation. The method comprises the following steps: making a cooling tower test model, wherein the reduced scale is 1: 150; selecting different types of wallpaper, respectively testing the roughness of each type of wallpaper, carrying out the throat model test of each type of wallpaper, and measuring the pressure coefficient of the throat part of a cooling tower; enabling the pressure coefficient measured through the test to be compared with the standard, and selecting the optimal roughness; carrying out the full-tower wind tunnel test through employing the wallpaper with the optimal roughness. The uniform wallpaper with the specific roughness is pasted on the surface of the cooling tower, so as to eliminate the impact caused by the inconsistency with the Reynolds number of an actual structure.

Description

technical field [0001] The invention relates to a technical measure for compensating and simulating the Reynolds number effect of the test model by pasting uniform wallpaper with specific roughness on the surface of the large-scale cooling tower wind tunnel test model. Background technique [0002] Large-scale cooling tower is one of the important cooling equipment for steam turbine units in thermal power plants. As a hyperbolic reinforced concrete thin shell structure, it is often used as water cooling equipment for power plants. Its operating performance is important for the safe and economical operation of power plants. influences. Among them, the natural ventilation counter-flow hyperbolic cooling tower is currently the most widely used cooling tower structure in domestic thermal power plants. Its thermal performance is greatly affected by surrounding environmental factors, and its structure is especially affected by the lateral wind load. The force on the ventilation t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/08
CPCG01M9/08
Inventor 刘庆宽孙一飞梁新华马文勇刘小兵
Owner SHIJIAZHUANG TIEDAO UNIV
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