Movable and portable wind erosion tunnel

Abstract

The invention relates to a movable and portable wind erosion tunnel. A tunnel body consists of a power section, an expansion section, a shrinking section, experimental sections, a pressure expanding opening and matched instruments. All sections of the tunnel are connected with each other through flanges which are integrally bent. Sealing strips are stuck at flange joints. The tunnel can be conveniently used for determining all kinds of wind erosion parameters of a field original ground surface. The movable and portable wind erosion tunnel is characterized in that: 1) a free vortex air flow and a stable-flow air flow field can be generated; 2) all kinds of wind force similar to natural climate can be generated; 3) the tunnel is durable, safe and reliable; and 4) the tunnel is convenient tomove and is easy to disassemble and assemble. The movable and portable wind erosion tunnel is suitable for carrying out all kinds of experimental observations in aspects of field wind and sand flow starting, wind speed and pressure, sand transport, erosion, model flow field and wind and snow flow, and researches in micro aspects such as grain speed, concentration, energy distribution and the like. Basic experimental equipment is provided for field ground surface wind erosion in-situ experiments, wind-blown snow experiments and researches on wind and sand movement rules under special environments (such as Qinghai-Tibet Plateau high-cold low-pressure environment and the like) in China.

Description

technical field [0001] The invention relates to a portable wind tunnel device for surface wind erosion research. Specifically, it is a movable wind tunnel for monitoring wind erosion and sand flow movement process in the field. Background technique [0002] There are usually three basic methods for the study of wind erosion on the surface, one is direct observation of wind speed and sand transport in the field under the action of natural wind; the other is simulation research in laboratory wind tunnel; the third is to use mobile wind tunnel to simulate natural wind , and conduct wind erosion measurement research directly on the natural surface. However, due to the shortness and variability of natural wind, the direct field observation period is long, and it is extremely difficult to compare the wind erosion process between various wind conditions and underlying surface conditions; for indoor wind tunnels, in the laboratory It is also extremely difficult to replicate the re...

AI Technical Summary

Problems solved by technology

Looking at the existing portable wind tunnels at home and abroad, there are mainly the following problems: first, the central axis of the power section is higher than the central axis of the experimental section, and the air flow in the experimental section is suspended on the surface, and the wind erosion effect on the surface not significant (see Figure 4 ); Secondly, the wind tunnels designed by Australia and Inner Mongolia Forestry College have no diffuser; the wind tunnels except Inner Mongolia Forestry College have no corner deflectors, that is, rotating cascades; the wind tunnels designed by China Agricultural University and the United States , the diffusion and contraction sections are asymmetrical, which will weaken the uniformity and stability of the airflow in the experimental section

In addition to the wind tunnel 1 designed by the Institute of Environment and Engineering in Cold and Arid Regions of the Chinese Academy of Sciences (see Figure 7 , Patent No.: 200810182207.X) and wind tunnel 2 (see Figure 8 ), the central axis of the rest of the wind tunnel power section is higher than the central axis of the experimental section, the airflow in the experimental section is uneven (mostly concentrated in the upper part), the airflow is suspended on the surface and flows, and the surface wind erosion effect is not significant. In Wind Tunnel 2 designed by the Institute of Environment and Engineering, the bottom of the rectification section is lower than that of the experimental section, and the experimental section cannot be placed on the ground, so wind erosion parameters of the original surface cannot be measured; while Wind Tunnel 1 has no rectification section, and the quality of the flow field is low , the inlet of the fan is easy to enter the sand, which affects the normal operation of the fan and the implementation of the experiment;

[0004] Looking at the above, at present, there are still low design wind speeds in wind tunnels at home and abroad, basically below 20ms-1; they are relatively heavy and inconvenient to move; Application of the test method

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