Abstract

A laser Doppler based method for in situ single blade tip clearance measurements of turbomachines with high precision is presented for what we believe is the first time. The sensor is based on two superposed fanlike interference fringe systems generated by two laser wavelengths from a fiber-coupled, passive, and therefore compact measurement head employing diffractive optics. Tip clearance measurements at a transonic centrifugal compressor performed during operation at 50,000rpm (833Hz, 586ms tip speed) are reported. At these speeds the measured uncertainty of the tip position was less than 20μm, a factor of 2 more accurate than that of capacitive probes. The sensor offers great potential for in situ and online high-precision tip clearance measurements of metallic and nonmetallic turbine blades.

© 2006 Optical Society of America

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References

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  1. J. P. Barranger and M. J. Ford, J. Eng. Power 103, 457 (1981).
    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
  6. L. Büttner, J. Czarske, and H. Knuppertz, Appl. Opt. 44, 2274 (2005).
    [CrossRef] [PubMed]

2005 (2)

T. Pfister, L. Büttner, and J. Czarske, Meas. Sci. Technol. 16, 627 (2005).
[CrossRef]

L. Büttner, J. Czarske, and H. Knuppertz, Appl. Opt. 44, 2274 (2005).
[CrossRef] [PubMed]

2003 (1)

2002 (1)

J. Czarske, L. Büttner, T. Razik, and H. Müller, Meas. Sci. Technol. 13, 1979 (2002).
[CrossRef]

1999 (1)

H. S. Dhadwal and A. P. Kurkov, J. Turbomach. 121, 481 (1999).
[CrossRef]

1981 (1)

J. P. Barranger and M. J. Ford, J. Eng. Power 103, 457 (1981).
[CrossRef]

Barranger, J. P.

J. P. Barranger and M. J. Ford, J. Eng. Power 103, 457 (1981).
[CrossRef]

Büttner, L.

T. Pfister, L. Büttner, and J. Czarske, Meas. Sci. Technol. 16, 627 (2005).
[CrossRef]

L. Büttner, J. Czarske, and H. Knuppertz, Appl. Opt. 44, 2274 (2005).
[CrossRef] [PubMed]

J. Czarske, L. Büttner, T. Razik, and H. Müller, Meas. Sci. Technol. 13, 1979 (2002).
[CrossRef]

Czarske, J.

L. Büttner, J. Czarske, and H. Knuppertz, Appl. Opt. 44, 2274 (2005).
[CrossRef] [PubMed]

T. Pfister, L. Büttner, and J. Czarske, Meas. Sci. Technol. 16, 627 (2005).
[CrossRef]

J. Czarske, L. Büttner, T. Razik, and H. Müller, Meas. Sci. Technol. 13, 1979 (2002).
[CrossRef]

Dhadwal, H. S.

H. S. Dhadwal and A. P. Kurkov, J. Turbomach. 121, 481 (1999).
[CrossRef]

Ford, M. J.

J. P. Barranger and M. J. Ford, J. Eng. Power 103, 457 (1981).
[CrossRef]

Haffner, K.

Kempe, A.

Knuppertz, H.

Kurkov, A. P.

H. S. Dhadwal and A. P. Kurkov, J. Turbomach. 121, 481 (1999).
[CrossRef]

Müller, H.

J. Czarske, L. Büttner, T. Razik, and H. Müller, Meas. Sci. Technol. 13, 1979 (2002).
[CrossRef]

Pfister, T.

T. Pfister, L. Büttner, and J. Czarske, Meas. Sci. Technol. 16, 627 (2005).
[CrossRef]

Razik, T.

J. Czarske, L. Büttner, T. Razik, and H. Müller, Meas. Sci. Technol. 13, 1979 (2002).
[CrossRef]

Rösgen, T.

Schlamp, S.

Appl. Opt. (1)

J. Eng. Power (1)

J. P. Barranger and M. J. Ford, J. Eng. Power 103, 457 (1981).
[CrossRef]

J. Turbomach. (1)

H. S. Dhadwal and A. P. Kurkov, J. Turbomach. 121, 481 (1999).
[CrossRef]

Meas. Sci. Technol. (2)

J. Czarske, L. Büttner, T. Razik, and H. Müller, Meas. Sci. Technol. 13, 1979 (2002).
[CrossRef]

T. Pfister, L. Büttner, and J. Czarske, Meas. Sci. Technol. 16, 627 (2005).
[CrossRef]

Opt. Lett. (1)

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Figures (3)

Fig. 1
Fig. 1

Superposed fanlike interference fringe systems: left panel, divergent fringes; right panel, convergent fringes.

Fig. 2
Fig. 2

Experimental setup of the laser-Doppler tip clearance probe. The passive optical measurement head is connected by fiber patch cables with the light source and the detection unit.

Fig. 3
Fig. 3

Tip clearance measured with the laser-Doppler probe at 50,000 rpm at different mass fluxes, compared to the data from a capacitive probe.

Equations (1)

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q ( z ) = f 2 ( v , z ) f 1 ( v , z ) = v d 2 ( z ) v d 1 ( z ) = d 1 ( z ) d 2 ( z ) .

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