Jingbo Yu , Guojian Kang , Wei Wang , Zhan Huang , Xuejun Zhao
DOI Number XXX-YYY-ZZZ
Conference Number HiSST 2018_2220894
The accurate measurement of temperature and heat flux has been one of the key problems in the development of hypersonic vehicle. In many high temperature processes, it is important to have accurate knowledge of temperature, especially in the materials processing in the metal and glass industries, measurement of turbine inlet temperatures in jet engines and in stationary gas turbine power plants. The maximum temperatures of these processes can reach as high as above 2000K, and the environments are always chemical corrosive or strong electromagnetic. Ordinary thermocouples cannot meet the requirements for stable and accurate operation in such high temperature applications. Optical-based temperature measurement systems have several advantages, including the ability to withstand high temperature and immunity from electrical noise due to their all-dielectric construction. The sapphire fiber-optic temperature sensor based on Black-Body radiation law, is a new technique of high temperature measurement in extreme environment, which combines techniques of radiometric thermometry and optical-based temperature measurement. In this paper, a system is established and conducted in FD-02 combustion gas flow tunnel in China Academy of Aerospace Aerodynamics (CAAA). This tunnel used the fuel-oxidant mixtures of air/kerosene to produce combustion gas flow, whose nozzle outlet diameter is 200mm. The mach number is 3 with the gas flow of 5kg/s. Results approved that the sapphire fiber-optic temperature sensor based on Black-Body radiation law has high sensitivity and is suitable for 800-1600 ℃ temperature measurement. The results are in good agreement with the Platinum-rhodium thermocouple. It was confirmed that sapphire fiber-optic temperature sensor could be used for accurate measurement of temperature in extreme environment with a millisecond response time.