Research Papers: Techniques and Procedures

Measurement of Fluid Distributions in a Rotating Fluid Coupling Using High Resolution Gamma Ray Tomography

[+] Author and Article Information
U. Hampel, D. Hoppe, A. Bieberle, E. Schleicher, M. J. da Silva, C. Zippe

 Institute of Safety Research, Forschungszentrum Dresden-Rossendorf e. V., P.O. Box 51 01 19, Dresden 01314, Germany

R. Kernchen, K.-H. Diele

 Voith Turbo GmbH, Voithstrasse 1, Crailsheim 74564, Germany

J. Fluids Eng 130(9), 091402 (Aug 12, 2008) (8 pages) doi:10.1115/1.2953295 History: Received August 10, 2007; Revised April 29, 2008; Published August 12, 2008

Gamma ray tomography has been used to visualize fluid distributions in a rotating fluid coupling in different operation points at a pump speed of 780rpm and lower turbine speeds. The gamma ray computed tomography system comprises a Cs-137 isotopic source and a high resolution gamma ray detector. An angle synchronized tomographic data acquisition technique was applied to produce sharp slice images from different positions along the coupling axis. The data have been used to assess the hydraulic behavior of the fluid coupling and to help improve our understanding of the flow structure development and its implications on torque transfer in such a device.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Construction of a fluid coupling with constant filling

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Figure 2

Idealistic view of the flow structure inside a fluid coupling for nonzero slip (taken and modified from Ref. 4)

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Figure 3

Secondary characteristic curves of the test coupling 422 SVW with controlled filling for different filling levels v. The solid curves represent the characteristics in the direction of the increasing slip and the dotted curves the characteristics for decreasing slip.

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Figure 13

Fluid distribution in the pump chamber at plane No. 25 at v=0.8 and s=0.25 and slip values denoted in the top row

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Figure 4

CAD drawing of the test coupling

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Figure 5

Photographs of the test coupling.

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Figure 6

Gamma ray tomography setup

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Figure 7

Geometry and principle of the CT scanning setup

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Figure 8

Axial measurement planes of the coupling

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Figure 9

Fluid distributions in different planes at s=0.25 (red: liquid, blue: gas)

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Figure 10

Three-dimensional view of the fluid-gas interface in a pump chamber

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Figure 11

Position of the phase interface (fluid-air) at v=0.8 and s=0.25 according to gamma ray CT measurements

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Figure 12

Camera image of the flow at the inner profile diameter from the turbine to the pump at v=0.8 and s=0.25.



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