Abstract Dynamic response calibration of gas flow temperature sensors was taken in the hot calibration wind tunnel, through which time constants of various temperature sensors under various working conditions were obtained, and key influencing factors were drawn such as diameter of welding ball, diameter of thermocouple wire, shield structure, gas flow Mach number, temperature and temperature step. Influencing mechanisms were anylised, and influencing laws of time constant were obtained. The results show that time constants can be decreased by decreasing diameter of welding ball, diameter of thermocouple wire, area ratio of shield inlet and outlet and temperature step, increasing gas flow Mach number and gas flow temperature, and using opposite opening structure of inlet and outlet. When diameter of thermocouple wire decreases from 0.8mm to 0.5mm, time constant decreases by 142.9%. The results can provide essential basis for design, use and dynamic compensation of gas flow temperature sensors.
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