Numerical Analysis And Simple Simulation Platform Of Solar Radiation Error

Radiosonde is a high-altitude meteorological measuring device, which uses a variety of meteorological sensors to measure meteorological elements from the ground to the upper air. However, the radiosonde temperature sensor is susceptible to solar radiation. It is easy to generate a solar radiation error in the daytime measurements. The errors caused by solar radiation may be as large as3℃or worse. It limits the measurement accuracy of the radiosonde temperature sensors.At present, the traditional correction methods include empirical estimation and wind tunnel experiment. However, the empirical estimation method is too simple. Wind tunnel experiments are constrained by cost and technology limitation. Thus, it is difficult to satisfy the high precision temperature measurements.A computational fluid dynamics (CFD) method is used to simulate the sounding temperature sensor. In order to verify the accuracy, a solar radiation error simulation platform is designed. This platform uses an test chamber to simulate the upper air environment. The rotation of the motor simulates the radiosonde ascenting from the ground to the upper air. By comparing a temperature sensors in the LED irradiation and another temperature sensors without LED irradiation, the solar radiation error derived.Numerical simulation covers both modeling and meshing. Subsequently, the sensor boundary condition is applied. Finally, heat transfer analysis is performed by using fluid-coupling method.By comparing the solar radiation error between simulation and experiment, the solar radiation error has a high degree of matching. Thus, computational fluid dynamics method may provide precise results for solar radiation sensor error correction. In addition, it will increase the measurement accuracy of the high-altitude temperature measurements.