PRINCIPLE OF CONVERTING THE MECHANICAL MOVEMENTS TO ELECTRICAL SIGNALS BY TURBINE METERS

Hakan Kaykisizli, Dr.Vahit CiftCi, Ernur Karadogan, Basak Akselli

Abstract

Turbine meter is a flow measurement device utilizes the angular velocity of rotating blades to measure the flow rate. Pulses for a known time period are counted by turbine meter counting mechanism. The total number of counts for a given time period is proportional to the volumetric flow rate of the turbine meter. National Metrology Institute of Turkey (UME) standard reference turbine meter pulse information is generated by a system called variable reluctance tachogenerator. <BR />This paper explains how mechanical movements of blades are converted to electrical signals and comparing the degree of conformity between the theoretical and experimental results. Meter factor k is utilised to compare experimental and theoretical results. Geometrical calculations and experimental results from the UME reference turbine meter are compared. Vector analysis of the forces acting on the blades showed that blades are moving slower than their geometrically predicted velocity. This is explained by effect of retarding torques on the exit velocity of the fluid.

Keywords

turbine meter, rotor, reluctance, magnetic field, retarding torque

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IMEKO-TC9-2003-034.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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