Influence of the Insertion Depth on the Response of a Hot Film Anemometer in Different Wind Tunnels

In calibration intercomparisons of hot-film, hot-wire or vane anemometers, significant deviations between different calibration laboratories are observed. The anemometer's probes influence the flow profile with which velocity should be measured. Our experiments give an example, how the geometric installation in a wind tunnel can affect the calibration results of anemometers. A typical hot-film anemometer has been used as test unit and the reference air velocity has been determined by a Laser Doppler Anemometer. The results of calibrations, according to the insertion depth of the probe in two different wind tunnels, are compared in this paper.