Development of hot-wire probe calibration wind tunnel based on compressible fluid

The output of the hot-wire is related not only to the fluctuation velocity, but also to the fluid temperature and density when the hot-wire technology is used to measure the turbulence intensity in a compressible fluid. Therefore, it is necessary to establish a calibration facility with similar characteristics to a high speed compressible fluid so that the accurate calibration of the hot-wire probe can be done before its usage. In this paper, the aerodynamic overall scheme, structural design and development of measurement and control system of the hot-wire probe calibration wind tunnel are introduced and illustrated based on subsonic and transonic compressible fluids. According to the results of the wind tunnel flow field calibration tests, the maximum deviation of the Mach number in the model area is 0.002; the dynamic pressure can be adjusted from 0.5 to 1.7 times of the normal dynamic pressure; the variation range of temperature and density is wide; the uniformity of the flow field are good. All the requirements for the hot-wire probe calibration are satisfied.