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The influence of viscosity on turbine flow meter calibration curves

The influence of viscosity on turbine flow meter calibration curves
The influence of viscosity on turbine flow meter calibration curves

Faculty of Engineering and Applied Science Doctor of Philosophy The influence of viscosity on turbine flow meter calibration curves by Ali Fakouhi Tlie sensitivity of the turbine flow meter to changes in fluid viscosity puts in question claims of accuracy (1%) and repeatability (.2%). The present results show that the output signal is a function of flow-rate and fluid viscosity. A theoretical model applicable to all groups of turbine meter, which explicitly involves fluid viscosity, has been produced, which can be applied to the fluid dynamic characteristics of the turbine flow meter. The Eulcr turbine equation witli modifications to allow for Uie effect of tip clearance and fluid viscosity has been applied in this work. Viscosity and flow i-atc dependence have been considered term by term in the main turbine equation. Experiment leads to a division into two groups, firstly calibration curves produced from helically bladed rotors which have a lower degree of sensitivity with respect to fluid viscosity, and secondly those of constant blade angle rotors which are more sensitive to changes in fluid viscosity. Fluid dynamic characteristics of the tip clearance flow are discussed as well as tlie effect of fluid viscosity on the flow pattern in tliis area. A tlieoretical model has been made to calculate the tip clearance flow. Also a semi-empirical calculation is shown to predict the calibration curve for a given fluid viscosity according to the design of turbine meter. However, for a particular design and a known calibration curve some suggestions are made of possible improvements in tlie calibration perfomiance, for instance by optimising tip clearance and bearing friction. The term by term calculation of the main turbine equation allows the prediction of improved insensitivity to tlie effect of fluid viscosity for certain changes of meter geometry.

University of Southampton
Fakouhi, Ali
Fakouhi, Ali

Fakouhi, Ali (1977) The influence of viscosity on turbine flow meter calibration curves. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Faculty of Engineering and Applied Science Doctor of Philosophy The influence of viscosity on turbine flow meter calibration curves by Ali Fakouhi Tlie sensitivity of the turbine flow meter to changes in fluid viscosity puts in question claims of accuracy (1%) and repeatability (.2%). The present results show that the output signal is a function of flow-rate and fluid viscosity. A theoretical model applicable to all groups of turbine meter, which explicitly involves fluid viscosity, has been produced, which can be applied to the fluid dynamic characteristics of the turbine flow meter. The Eulcr turbine equation witli modifications to allow for Uie effect of tip clearance and fluid viscosity has been applied in this work. Viscosity and flow i-atc dependence have been considered term by term in the main turbine equation. Experiment leads to a division into two groups, firstly calibration curves produced from helically bladed rotors which have a lower degree of sensitivity with respect to fluid viscosity, and secondly those of constant blade angle rotors which are more sensitive to changes in fluid viscosity. Fluid dynamic characteristics of the tip clearance flow are discussed as well as tlie effect of fluid viscosity on the flow pattern in tliis area. A tlieoretical model has been made to calculate the tip clearance flow. Also a semi-empirical calculation is shown to predict the calibration curve for a given fluid viscosity according to the design of turbine meter. However, for a particular design and a known calibration curve some suggestions are made of possible improvements in tlie calibration perfomiance, for instance by optimising tip clearance and bearing friction. The term by term calculation of the main turbine equation allows the prediction of improved insensitivity to tlie effect of fluid viscosity for certain changes of meter geometry.

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Published date: 1977

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Local EPrints ID: 467167
URI: http://eprints.soton.ac.uk/id/eprint/467167
PURE UUID: 993bf78e-d4fd-4348-8d20-cbdaeaf15317

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Date deposited: 05 Jul 2022 08:14
Last modified: 05 Jul 2022 08:14

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Author: Ali Fakouhi

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