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Title: Nists New 3D Airspeed Calibration Rig Addresses Turbulent Flow Measurement Challenges
Author: Iosif I. Shinder Vladimir B. Khromchenko Michael R. Moldover
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: Outdoor air flows and flue - gas flows in large conduits and large stacks have significant swirl and turbulence. Accurate measurements of such complex flows are needed by weather services and diverse industries ( e.g. automotive, aircraft, wind - power, fossil - fueled electricity - generating). T he instruments used for accurately measuring complex flows must be calibrated under conditions similar to the conditions encountered wh en these instruments are used in the field. To meet th is requirement, NIST developed a 3 - dimensional (3 - D) calibration rig that orients test instruments at user - selected pitch angles ( - 45 to 45 ) and yaw angles ( - 180 to +180 ) with a resolution of 0. 1 with respect to the air flow in NISTs wind tunnel. The rig accommodates probes up to 2.5 m long and achieves an expanded air speed uncertainty of approximately 1% (95 % confidence level) over the range 5 m/s to 45 m/s.

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