A Physical Simulation Method for the Coupling of Background Wind and Moving Downburst

Abstract

The invention discloses a physical simulation method for coupling of background wind and mobile downburst. The physical simulation method comprises the following steps: 1) mounting a test model structure on a test bed; 2) starting a wind tunnel fan, forming background wind with set flow speed in a wind tunnel runner, and after the characteristic of a background wind field is stable, measuring thegenerated flow field characteristic of the background wind; 3) starting a downburst simulator to simulate the downburst with set wind power, setting a moving path of the downburst simulator, using a downburst simulator moving device to drive the downburst simulator to move, and enabling the moving path of the downburst simulator to pass through a test model structure from far to near or from nearto far; and 4) measuring the wind field characteristic after downburst coupling under the background wind and mobile state and coupling load borne by the test model structure under different downburstwind field distance conditions. The wind field characteristic and coupling load under the coupling action of the downburst and the background wind can be better studied.

Description

technical field [0001] The invention belongs to the technical field of wind tunnels, in particular to a physical simulation method for coupling background wind and moving downburst. Background technique [0002] A downburst is a local strong convective weather phenomenon accompanied by thunderstorms, and the background wind refers to the wind below the atmospheric boundary layer. As an extreme wind load, the downburst has caused amazing damage to various building structures such as transmission line towers, long-span spaces, and cantilevered roofs, bringing serious casualties and huge property losses to the society. In recent years, with the rapid development of computer science and technology, the CFD numerical method has gradually become the main method in the field of structural wind engineering to study the near-ground wind field and wind profile characteristics of downbursts. However, due to the complexity of the downburst wind field, it is difficult to obtain satisfac...

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Problems solved by technology

Current wind tunnel test simulations are often limited to only considering the wind field caused by the downburst, but fail to consider the influence of the atmospheric boundary layer wind field

However, in reality, the downburst and the background wind exist at the same time, and the coupling effect of the background wind (or monsoon) and the moving downburst must be considered when designing a building structure against downburst However, the existing devices and simulation methods cannot accurately simulate the wind field when the actual downburst disaster occurs

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