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Effect of Turbulence on Vortex-shedding Air-velocity Transducers.
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When location guidelines are followed in choosing sites for fixed- point velocity transducers for use in underground coal mine monitoring, mine air turbulence intensities <11 pct are generally expected at those sites. The objective of this Bureau of Mines investigation was to determine the effect of turbulence intensities <11 pct on vortex-shedding sensors and transducers. Measurements were made at velocity levels of interest for underground coal mine monitoring use ( 200, 500, 1,000, 1,500 ft/min.). The effect of grid-produced turbulence intensities (2 pct to 14 pct) on the output of vortex-shedding air-velocity transducers was less than +/- 10 pct.
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Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division