Simulation Analysis of Wind Field Characteristics inside the Reinforced Plastics Screen

The wind flowing through the sensor is one of the main factors determining the accuracy of the temperature measurement of reinforced plastics screen. Based on the computational fluid dynamics (CFD) simulation, the relationship between the wind of reinforced plastics screen and the environmental wind which is widely used in surface meteorological observation is studied. The results show that due to the influence of the cuboid structure and the lateral vane diversion, the wind of reinforced plastics screen is obviously inhomogeneous. Obvious fusiform flow and annular flow fields appear on the horizontal and vertical profiles, respectively. Reinforced plastics screen has significant blocking effect on the flow of air. There is vertical difference in the average relative wind speed reduction ratio along the axis of reinforced plastics screen, and the minimum is 53% at around 0.08-m height. At the heights of around 0.25 m and 0.55 m, the local maximum values of average relative wind speed reduction ratio can reach up to 85% and 88%, respectively. The average relative wind speed reduction ratio varies periodically with changes in the environmental wind direction. When the wind directions are 45°, 135°, 225°, and 315°, the minimum value is 73%. When the wind direction is 0°, 90°, 180°, and 270°, the maximum value is 93%.