Natural wind simulation method for wind erosion wind tunnel experiment

Abstract

The invention relates to a natural wind simulation method for a wind erosion wind tunnel experiment. The method includes the following steps that: four groups of natural wind speed data are collected;any group of wind speed data is selected from a wind speed database, the maximum wind speed and minimum wind speed of the selected wind speed data are extracted, time t for wind speed to change to the maximum wind speed from the minimum wind speed is determined, and the ratio K of the cumulative time t to the total time of the data is solved; the average interval time of the presence of the maximum wind speed and minimum wind speed is set to be 0.5T, and time t' taken by each wind speed in a p 0.5T period is calculated according to 0.5KT, and each wind speed is corresponding to t' in the 0.5Tperiod from small to large, a curve about the change of the natural wind speed with time in the 0.5T period is formed, and a curve about the change of the natural wind speed with the time in a complete period T is formed; a curve about the change of the natural wind speed with the time in the complete period T under the other three groups of wind speed data is obtained; and air blow is adjusted according to wind speeds in the above curves, the wind speed control signal curve of a wind erosion wind tunnel, which is formed by the voltage signals of a speed governor and t', is measured, and airblow is adjusted according to the curve, so that natural wind can be simulated.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel experiments, in particular to a natural wind simulation method for wind erosion wind tunnel experiments. Background technique [0002] Wind erosion is the erosion effect of wind, which refers to the process in which surface materials are eroded, abraded and taken away under the action of wind. When the wind blows over the surface, turbulence is generated to make the sand leave the surface, thereby destroying the surface material, which is called blowing erosion; when the wind and sand flow moves close to the ground, the impact and friction of the sand on the ground material are eliminated. called abrasion. In the dry area with many windy days and high wind speed, wind erosion is very prevalent. On the steep rock wall, small caves and pits of different sizes and shapes are formed by wind erosion, which are called wind erosion niches; isolated and protruding rocks After long-term wind erosion,...

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Problems solved by technology

However, although the wind erosion tunnel is different from the traditional wind tunnel in structure, the control of the wind erosion wind tunnel for the experimental wind speed is still a stable wind speed, and the stable wind speed obviously lacks authenticity and stability compared with the natural wind. The experimental data obtained under the wind speed will inevitably lead to a decrease in credibility

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