Dual-test-section straight-flow gust wind tunnel with bypasses

Abstract

The invention discloses a dual-test-section straight-flow gust wind tunnel with bypasses. The dual-test-section straight-flow gust wind tunnel comprises a settling and contraction section, a first test section, a confluence section, a power section, a diversion section, a second test section and an exit section which are connected in sequence, and is characterized by further comprising bypass sections with one ends connected with the confluence section and the other ends connected with the diversion section. The gust wind tunnel can generate low-frequency gust and simulate the gust effect of natural wind in the atmospheric boundary layer for research on influence from gust to various physical phenomenons in the in the atmospheric boundary layer; as two types of test can be carried out inside the same gust wind tunnel, the gust wind tunnel is much economical, rapid and effective.

Description

technical field [0001] The invention relates to a gust wind tunnel experimental device, more specifically, it relates to a direct current gust wind tunnel with double test sections with a bypass. Background technique [0002] Simply put, a wind tunnel is a specially designed long-shaped pipe, in which a power system (motor and fan) generates an air flow that can be controlled freely by humans, and is used to simulate the flow of air when objects move in the air. Phenomena, the situation of objects under force, the phenomenon of air flow around certain fixed objects, and the migration and diffusion of smoke in the air, etc. ". [0003] Boundary layer wind tunnels are playing an increasingly important role in the research of wind engineering. The boundary layer wind tunnel has the ability to simulate the flow of the atmospheric boundary layer, and can provide technical support for the study of the diffusion law of atmospheric pollutants and the safety design research of many ...

AI Technical Summary

Problems solved by technology

The main reason why the DC blowing type is not suitable is that its power section is located upstream of the test section. When the fan rotates at low speed, the gap between the multi-blades is large, which will produce a burst effect of fixed frequency. At the same time, when the wind diffuses downward through the power section, it will produce Turbulence in multiple directions leads to unstable wind environment

Due to the characteristics of closed backflow in the backflow wind tunnel, the pollution source cannot be discharged outside the experimental environment after being released during the pollutant experiment, which makes the background pollution concentration in the test section continuously increase and hinders the measurement of the experiment.

For material transmission experiments such as sand and dust, it is necessary to choose a direct current blowing wind tunnel, and the use of direct current suction and return flow will cause sand and gravel to be brought into the power section by the air flow and damage the fan.

[0009] Some closed-circuit and open-circuit dual-purpose wind tunnels in foreign countries have complex structures, difficult operations, and cannot produce burst effects, so they cannot be used in wind tunnels for large-scale engineering applications.

Generally, one wind tunnel can only be used for one kind of test, not to mention the high cost of the wind tunnel, and the efficiency is not high. This invention provides a double-test gust wind tunnel device, which can carry out two tests in one wind tunnel, which saves a lot Reduced cost and improved efficiency

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