强制通风温度传感器计算流体动力学设计与分析

Computational Fluid Dynamics Design and Analysis of Forced Ventilation Temperature Sensor

自然通风防辐射罩内部的温度传感器受到太阳辐射的影响会导致其温度测量值高于大气真实温度,辐射误差可达0.8℃甚至更高。为提高气温观测精度,文中提出一种强制通风温度传感器设计。利用计算流体动力学方法(CFD)分析计算该传感器在不同环境条件下的辐射误差,采用麦夸特法对仿真数据进行拟合,获得辐射误差修正方程。结果表明,强制通风温度传感器具有较高的气温观测精度,可达0.05℃量级。CFD仿真结果和辐射误差修正方程结果之差小于0.005℃,两者具有较高的一致性。

Due to solar radiation effect,current air temperature sensors inside a naturally ventilated radiation shield may produce a measurement error that is 0.8 ℃ or higher. To improve the observation accuracy,a forced ventilation temperature sensor was proposed in this paper. A computational fluid dynamics（ CFD） method was implemented to obtain the radiation error of the forced ventilation temperature sensor under various environmental conditions. The CFD results were fitted by a levenberg-marquardt method and a global optimization method.Then,a radiation error correction equation was obtained.The results show that the forced ventilation temperature sensor has a high precision observation and measurement precision can reach 0.05 ℃. The difference between the CFD results and the results given by the radiation error correction equation is less than 0.005 ℃,there is a high consistency between them.