Theoretical and experimental studies of turbine flowmeters
Theoretical and experimental studies of turbine flowmeters
A new theoretical model of the flow through the tip-clearance is presented to describe the behaTloiir of the calibration curves of tur- bine flowmeters. When constants in the theoretical equation are determined empirically the equation plotted agrees well with experimental results. Analysis using this leakage model shows that reducing the frictional torque on turbine meters to a minimum can increase the variation of the meter coefficient over the operating range rather than its intended purpose of decreasing it. Velocity profiles within meter annuli of different hub-ratios were measured and the results show that they are quite different firom those previously assumed. Empirical equations are developed to predict the profiles. Experiments carried out on different turbine meters show that the behaviour of their calibration curves depends not only on the tip-clearances and hub-ratios but also on the types of blades the rotors are having. The calibration curves are found to be susceptible to changes in upstream velocity profile and to upstream disturbances but by the proper choice of type of blades, hub-ratio and tip-clearance, their effects could be kept to a minimum. In general, constant blade angle meters are better In avoiding such effects. Based mainly on the results of this research, a guide to the design of turbine meters is given.
University of Southampton
Tan, Philip Ah Kow
7dbca8ad-171d-4373-a1a0-a4bf6030c9a3
1973
Tan, Philip Ah Kow
7dbca8ad-171d-4373-a1a0-a4bf6030c9a3
Tan, Philip Ah Kow
(1973)
Theoretical and experimental studies of turbine flowmeters.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
A new theoretical model of the flow through the tip-clearance is presented to describe the behaTloiir of the calibration curves of tur- bine flowmeters. When constants in the theoretical equation are determined empirically the equation plotted agrees well with experimental results. Analysis using this leakage model shows that reducing the frictional torque on turbine meters to a minimum can increase the variation of the meter coefficient over the operating range rather than its intended purpose of decreasing it. Velocity profiles within meter annuli of different hub-ratios were measured and the results show that they are quite different firom those previously assumed. Empirical equations are developed to predict the profiles. Experiments carried out on different turbine meters show that the behaviour of their calibration curves depends not only on the tip-clearances and hub-ratios but also on the types of blades the rotors are having. The calibration curves are found to be susceptible to changes in upstream velocity profile and to upstream disturbances but by the proper choice of type of blades, hub-ratio and tip-clearance, their effects could be kept to a minimum. In general, constant blade angle meters are better In avoiding such effects. Based mainly on the results of this research, a guide to the design of turbine meters is given.
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Published date: 1973
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Local EPrints ID: 462245
URI: http://eprints.soton.ac.uk/id/eprint/462245
PURE UUID: 92edabbe-4636-4c67-a7c5-5225bc1bbcf3
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Date deposited: 04 Jul 2022 19:04
Last modified: 16 Mar 2024 18:54
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Author:
Philip Ah Kow Tan
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