Smoke visualization of flow separation on a 3-D differential pressure airspeed sensor. The computer-controlled system can acquire data at a rate of 300 points / hour.įigure 3. The angular ranges are: yaw ☑80° pitch ±45°, both with expanded uncertainties ☐.3°. The stage points the anemometer at user-selected pitch and yaw angles with respect to the wind direction. NIST provides customers with information on the “tilt response” of their airspeed instruments, allowing corrections or realistic uncertainty estimates for the misalignment of the instrument with the airspeed direction.Īnemometers undergoing calibration in the lower test section can be mounted on a “probe holder” that is supported by a computer-controlled stage (See Fig. Recently, NIST began calibrating anemometers as a function of airspeed, pitch angle, yaw angle, and turbulence intensity. The lower test section is used to calibrate customers' anemometers and to conduct research directed towards improving airspeed measurements. (see Shinder et al.,2013 and related publication #1) The fractional uncertainty (at 95% confidence level) of the working standards is (0.0044 + 0.0016/ u 2), where u is the airspeed in m/s.
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