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TECHNICAL PAPERS: Gas Turbines: Controls, Diagnostics, and Instrumentation

A Fiber-Optic Tip-Shroud Deflection Measurement System

[+] Author and Article Information
R. A. Rooth, W. Hiemstra

KEMA Nederland B.V., P.O. Box 9035, 6800 ET Arnhem, The Netherlands

J. Eng. Gas Turbines Power 123(2), 359-362 (Oct 01, 2000) (4 pages) doi:10.1115/1.1364498 History: Received October 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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References

Barranger,  J. P., and Ford,  M. J., 1981, “Laser Optical Blade Tip Clearance Measurement System,” J. Eng. Power, 103, No. 2, p. 58.
Davinson,  I., 1987, “Astigmatic Turbine Blade Tip Clearance Sensor for Gas Turbine Aero Engines,” Proc. SPIE, 863, pp. 60–63.
Davinson,  I., 1990, “The Use of Optical Sensors and Signal Processing in Gas Turbine Engines,” Proc. SPIE, 1374, pp. 251–265.
Chivers, J. W. H., 1989, “A Technique for the Measurement of Blade Tip Clearance in a Gas Turbine,” 25th Joint Propulsion Conference, AIAA Paper No. 89-2916.
Müller, D., et al., 1996, “Capacitive Measurement of Compressor and Turbine Blade Tip to Casing Running Clearance,” ASME Paper No. 96-GT-349.
Grzybowski et al., 1996, “Microwave Blade Tip Clearance Measurement System,” ASME Paper No. 96-GT-002.
Exxon, Peterson, J. F. D., 1993, notes of the 1992 Frame 6 Gas Turbine User’s Roundtable.

Figures

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Principle of the astigmatic optic deflection probe
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Optical configuration of the astigmatic probe. Spherical lens f=25 mm. Cylindrical lens f=83 mm.
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Tip shroud deflection probe, mounted on the turbine
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Layout of the detection cabinet
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A series of three successive calibration runs, showing the good reproducibility
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Example of the distance signal of the tip shroud monitor, the arrow shows the measurement at the enlarged cooling hole position
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Picture of the tip shroud segments. The picture shows the cooling holes and the enlarged hole for identification of the blades.
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Step sizes with turbine on turning gear, 1200 rev/min
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Step sizes with turbine at full load, 36 MW. Turbine frequency 85 Hz.
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Step sizes with turbine at rest, mechanical measurement during an overhaul

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