温包型温度传感器的工质选择

Working Medium Choice for Thermometer Bulb Type Sensor

为研究温包型温度传感器在航空发动机和飞机控制系统中的应用,对温包型温度传感器的充填工质进行了分析。根据工质的热力学特性及传感器的使用温度范围,将温包分为气态、液态、蒸汽态3种类型,阐述了不同类别工质的物理特性与温度变化的关系,汇集了常见工质的主要特性参数,归纳了根据传感器用途选择工质的原则。结果表明:气态工质的计算符合范德华方程;液态工质则按照体积膨胀计算;蒸汽态工质可按照项-谭方程进行设计计算。根据以上方法设计的不同温包已在多种发动机和飞机附件中得到应用。

In order to study the application of thermometer bulb type temperature sensor in aeroengine and aircraft control system, the working medium filled in thermometer bulb type temperature sensor was analyzed. According to the thermodynamic properties of the working medium and temperature range of the sensor, the temperature bulb is divided into three types： gas, liquid and vapour. The relationship between the physical properties and temperature variation of different types of working medium is described, and the main characteristics parameters of common working medium are collected, then the principle of choosing the working medium according to the sensor application are summaried. The results shows that the calculation of gas medium is consistent with Van der Waals equation; the liquid medium is calculated according to the volume expension; and the vapour medium can be designed and calculated according to Xiang-Tan equation. Different thermometer bulbs designed according to the above method has been applied in many other aeroengine and aircraft accessories.