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Straight-flow suction gust wind tunnel with bypasses

A gust and wind tunnel technology, applied in the field of gust wind tunnel experimental devices, can solve problems such as hindering measurement, turbulent flow, and unstable wind environment, and achieve the effect of reducing unstable interference

Pending Publication Date: 2019-05-24
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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, when the pollutants are tested, the pollution sources cannot be discharged out of the experimental environment after being released, so that the background pollution concentration in the test section is continuously superimposed and increased, which hinders the measurement of the experiment.

Method used

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  • Straight-flow suction gust wind tunnel with bypasses
  • Straight-flow suction gust wind tunnel with bypasses
  • Straight-flow suction gust wind tunnel with bypasses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The embodiment of the present invention proposes a direct-current suction gust wind tunnel with a bypass to realize gusts with high and low frequencies. Such as figure 1 When the suction-type DC gust tunnel in the embodiment of the present invention shown is in operation, the fan drives the fan 109 to rotate to generate an airflow. Controlling the opening of the shunt door 114 allows part of the airflow in the main channel to be sucked into the bypass channel 115 under the influence of the suction generated by the fan in the power section 101 after it moves. Also through the opening and closing of the movable vane 119 in the throttle valve 116 in the bypass passage 115, the air flow in the bypass passage changes, and then enters the diffuser section 104 communicating with the bypass passage 115 through the opening and closing door 117, so that The airflow flowing through the test section 103 changes instantaneously, forming gusts with varying wind speeds. When the ope...

Embodiment 2

[0053] In this embodiment, the throttle valve 116 in the first embodiment is replaced by a rotary throttle valve 216 , and the rotary throttle valve 216 includes an arc-shaped piece 219 and a rotating shaft 218 . The axial direction of the rotating shaft 218 is perpendicular to the wind direction in the bypass passage 115, and the arc-shaped piece 219 is fixedly connected with the rotating shaft 218 and can rotate with the rotation of the rotating shaft 218. By controlling the area blocked by the arc-shaped sheet 219 in the bypass passage 115 Size, to control the air flow in the bypass channel 115. The arc-shaped sheet 219 can rotate through the rotating shaft 218; the rotation of the arc-shaped sheet 219 is driven by controlling the rotation of the rotating shaft 218, thereby changing the size of the wind speed in the test section 103 to form a gust of wind speed.

[0054] The principle is as follows: Figure 5 When the direct-flow suction gust tunnel in the embodiment of th...

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Abstract

The invention discloses a straight-flow suction gust wind tunnel with bypasses. The bypasses have two types, one refers to throttle valve type with moving blades and the other refers to rotary intercept valve type with arc vanes. The technical points include that the gust wind tunnel becomes a straight-flow suction wind tunnel when diversion gates and a gate are closed simultaneously; when the diversion gates and the gate are opened simultaneously, throttle valves with moving vanes or rotary intercept valves run, a part of air flow passing through the test section is divided by the bypasses and jumps over of the test section directly to arrive at a diffuser section and then flows to the external through an exit section directly, velocity of air flow in the test section varies to be high orlow, so that gust is generated; meanwhile, rate of variation of gust in the test section changes by regulating open and close frequency of the moving vanes of the throttle valves or rotary speed of the rotary intercept valves. The gust wind tunnel can generate gust similar to natural wind.

Description

technical field [0001] The present invention relates to a kind of gust wind tunnel experimental device, more specifically, it relates to a kind of direct current suction gust wind tunnel with bypass. Background technique [0002] Simply put, a wind tunnel is a specially designed long pipe, which generates an airflow that can be controlled freely by the power system (motor and fan) inside it, and uses it 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] Air pollution, also known as air pollution, according to the definition of the International Organization for Standardization (ISO), air pollution usually refers to certain substances entering the atmosphere due to human activities or natural processes, presenting sufficient concentrations, reaching sufficient time, and Phenomena that are thus je...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/04
Inventor 田文鑫张明王圣胡耘安凤霞闵俊杰
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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