基于分布式光纤测温的结冰风洞喷雾耙温度场测量

Temperature Field Measurement of Spray Bar in Icing Wind Tunnel Based on Distributed Optical Fiber Temperature Measurement

为了实时获取结冰风洞喷雾耙温度场数据,需要采用温度传感器采集温度信号,传统的热电阻式温度传感器需要连接大量长距离线缆,占用大量喷雾耙内部空间;为提高温度场测量的质量效率,对基于分布式光纤测温的结冰风洞喷雾耙温度场测量技术进行了研究;首先,分析了喷雾耙温度场测量概况,研究了分布式光纤测温方法;其次,设计了U型光纤布线方法,建立基于分布式光纤测温的结冰风洞喷雾耙温度场测量系统;最后,实现了20层喷雾耙温度场全局测量,并对喷雾耙温度场分布进行了详细分析;经实际应用表明,喷雾耙温度场测量系统可为喷雾耙电加热系统提供了温度反馈,大大提高了温度场测量效率。

In order to obtain the temperature field data of the spray bar in the icing wind tunnel in real time,temperature sensor needs to be used to collect the temperature signal.The traditional thermal resistance temperature sensor needs to connect a large number of long-distance cables,which takes up a large amount of internal space of the spray bar.For improving the quality and efficiency of temperature field measurement,the measurement technology of spray bar temperature field in icing wind tunnel based on distributed optical fiber temperature measurement is studied.Firstly,the general situation of measuring temperature field of spray bar is analyzed,and the distributed optical fiber temperature measurement method is studied.Secondly,U type optical fiber wiring method is designed,and the temperature measuring system of spray bar in icing wind tunnel based on distributed optical fiber temperature measurement is established.Finally,the global temperature measurement of 20 layers of spray bars is realized,and the temperature field distribution of spray bar is analyzed in detail.The practical application shows that the spray bar temperature field measurement system can provide temperature feedback for the spray bar electric heating system,and improves the measurement efficiency of the temperature field greatly.