INFLUENCE OF SHAPE DEVIATIONS ON THE MEASUREMENT PRECISION OF VORTEX FLOW METERS
Ernst von Lavante, Burger Nath
Abstract:
In the present investigation, the problem of accurate determination of volumetric flows by means of the so-called vortex-shedding flow meter in the case of shape changes and deviations of the geometry from the original specifications due to manufacturing tolerances and imperfections was studied. To this end, the flow about the bluff body used in the presently studied vortex-shedding flow meter was numerically simulated using a solver of the unsteady, compressible (air) or incompressible (water) Navier-Stokes equations in two and three dimensions. The computations were carried out for several types of modified geometry including a slightly rotated bluff body, rounded edges representing wear and asymmetrically oriented sensor body called here “paddle”. The results were compared, where possible, with experimental data obtained by the manufacturer. The effects of turbulence were modeled by using the realizable k-ε turbulence model. The resulting flow fields were analyzed using various methods, including visualization, evaluation of several of their global features and DFT of properly chosen variables.
Download:
IMEKO-TC9-2003-079.pdf
DOI:
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Event details
IMEKO TC:
TC9
Event name:
FLOMEKO 2003
Title:
11th Conference on Flow Measurement
Place:
Groningen, NETHERLANDS
Time:
12 May 2003 - 14 May 2003
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