A wind tunnel for anemometer calibration in the range of 0.2–1.25 m/s

In order to calibrate different types of anemometers in a low-speed range (0.2–1.25 m/s) using pressure measurements, a wind tunnel has been built and characterized. The wind tunnel has a low-speed section and a high-speed section. The wind tunnel calibration has been performed by means of comparison of airspeed at the test cross section (low-speed) and at the reference cross section (high-speed). Measurements have been taken with a calibrated hot-wire anemometer and static and total probes respectively. A linear fitting is used to relate reference and test airspeed. A model based on mass conservation law has been developed. Calculations have been made with and without introducing the effect of the speed profile. Uncertainties of the experimental calibration are presented.

► A simple wind tunnel for anemometer calibration in the range of 0.2–1.25 m/s has been developed.
► The device uses pressure measurements.
► The calibration has been performed by means of comparison of airspeed at two cross sections.
► A linear fitting is used to relate reference and test airspeed.
► A model based on mass conservation law has been developed.