Comparison of calibrations of wind speed meters with a large blockage effect

J. Geršl, P. Busche, M. de Huu, D. Pachinger, H. Müller, K. Hölper, A. Bertašienė, M. Vilbaste, I. Care, H. Kaykısızlı, L. Maar, S. Haack

Abstract

In this paper we report on the first results of EURAMET project no. 1431 which was initiated in 2017 with a goal to experimentally determine systematic deviations of calibration results of vane and cup anemometers due to various boundary conditions in different wind tunnels especially in wind tunnels with open test section where theoretical models are missing. For that purpose 3 vane anemometers and 2 cup anemometers of various dimensions have been calibrated in 14 wind tunnels with various types and sizes of test sections ranging from 15 cm to 100 cm in diameter. This paper provides the first look to calibration data from the recently completed measurements. On top of that, velocity disturbance fields in front of the 5 tested anemometers have been measured in order to avoid mixing of the effect of boundary conditions with other source of deviations due to placing a reference meter to an area influenced by a meter under test. The velocity disturbance fields reported in this paper can be useful for all air speed calibration laboratories giving an idea how large these deviations can be and what is the optimal position and distance of a reference meter.

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IMEKO TC

TC9 - Flow Measurement

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