The free steam wind tunnel allows for the calibration of pressure and temperature probes. Its air supply is provided by a radial compressor, with a variable speed DC-motor (50kW, 2900rpm). The Witoszynski nozzles have a diameter of either 120mm or 200mm and the ratio between nozzle diameter and settling chamber length is 1:70 and 1:42 respectively. The maximum air speed of the wind tunnel is 100m/s, corresponding with a Mach number of 0,3, where a screen ensures a constant turbulent intensity of around 1%. Moreover, yaw and pitch angles can be comfortably changed using a traversing system. The operating point of the wind tunnel is set and monitored through the revolutions of the motor, the total pressure and total temperature in the settling chamber.

The free jet wind tunnel in the laboratory for fluid flow machinery