探空温度传感器的流固耦合多物理场仿真分析

Fluid-solid Coupling Multiphysics Simulation of Sounding Temperature Sensor

高空大气温度探测过程中,太阳辐射引起的探空温度传感器升温是影响温度测量精度的重要因素。传统的经验估测法和模型简化法难以对探空温度传感器在高空气流环境中的温度测量结果进行精确的定量求解。为解决上述问题,采用流固耦合多物理场分析方法对探空温度传感器进行计算流体动力学仿真。仿真结果表明,引线夹角较大的探空温度传感器的测温结果受太阳高度角影响较小;四引线结构探空传感器的测温结果受太阳照射角度变化影响较小,可获得较高精度。通过遗传算法对仿真结果进行拟合,获得探空温度传感器在不同太阳高度角和方位角条件下的测温结果计算方程。最后,通过理论分析探空温度传感器测量结果的变化趋势,验证流固耦合多物理场仿真分析结果的可信性。

The temperature rise caused by solar radiation is an important factor which affects the temperature measurement accuracy during the observation of upper atmosphere. Traditional modeling methods use empirical equa- tions or simplified models, which are unable to offer precise numerical temperature measurements. To tackle this is- sue, a fluid - solid coupling multiphysics method was implemented to perform computational fluid dynamics （CFD） simulation of the senor. The CFD results show that the temperature measurement results of sounding temperature se- nor with larger lead angle are less affected by the solar elevation angle. The temperature measurement results of the structure with four leads are less affected by the solar angle and feature the optimal accuracy. A temperature rise e- quation was obtained by fitting the CFD results using a genetic algorithm method, where the solar elevation and azi- muth angles act as two major variables. At last, the credibility of the fluid - solid coupling multiphysics simulation was demonstrated by analyzing the temperature result trend of the sensor.