This paper deals with a new type of damper seal developed for a high-pressure centrifugal compressor. Honeycomb seals and hole pattern seals are popularly used as damper seals and provide superior rotordynamic damping characteristics. Honeycomb seals are expensive because the manufacturing process is complex. Hole pattern seals are easier to manufacture, but they are still expensive. Use of a scallop pattern is one way to reduce manufacturing cost and time. A new seal that has a scallop pattern and small teeth on the stator surface is proposed. This pattern is cut on the stator surface using a disk type tool. To estimate the rotordynamic coefficients of this new seal, a bulk flow model code that is based on a two-control-volume model developed by Matsuda for labyrinth seals was newly developed. This model uses the Hirs model for the viscous shear stresses. The friction factor coefficients for the rotor surface, the stator surface, and the surface between the two-control-volumes were determined by computational fluid dynamics (CFD) steady analysis. The rotordynamic coefficients can also be obtained by using CFD perturbation analysis. The high accuracy of the bulk flow model was demonstrated by comparing its results with CFD perturbation analysis results. In the perturbation analysis, the whirling motion was treated as a steady-state problem by using a rotating frame of reference. For the damper seal, the rotor surface and its neighboring region were treated with a rotating frame of reference and the neighboring region of the stator was treated with a stationary frame of reference. The damping property of the new seal was evaluated by conducting rotor stability tests using a high-pressure compressor with an electromagnetic exciter. The new seal equipped with swirl brakes was used for the balance piston of the compressor. Stability was evaluated by exciting the rotor during operation and identifying the eigenvalues of the rotor. The experimental results showed that the new seal increases damping. Comparison of the damping effect with calculations based on the bulk flow analysis showed good agreement.
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Infrastructure Systems Company,
Hitachi, Ltd.,
e-mail: naohiko.takahashi.qb@hitachi-pt.com
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March 2015
Research-Article
Development of Scallop Cut Type Damper Seal for Centrifugal Compressors
Naohiko Takahashi,
Infrastructure Systems Company,
Hitachi, Ltd.,
e-mail: naohiko.takahashi.qb@hitachi-pt.com
Naohiko Takahashi
Turbomachinery R&D Center
,Infrastructure Systems Company,
Hitachi, Ltd.,
603 Kandatsu-machi
,Tsuchiura-shi, Ibaraki-ken 300-0013
, Japan
e-mail: naohiko.takahashi.qb@hitachi-pt.com
Search for other works by this author on:
Haruo Miura,
Haruo Miura
Compressor Division,
Infrastructure Systems Company,
e-mail: haruo.miura.wm@hitachi-pt.com
Infrastructure Systems Company,
Hitachi, Ltd.
,603 Kandatsu-machi
,Tsuchiura-shi, Ibaraki-ken 300-0013
, Japan
e-mail: haruo.miura.wm@hitachi-pt.com
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Mitsuhiro Narita,
Mitsuhiro Narita
Compressor Division,
Infrastructure Systems Company,
e-mail: mitsuhiro.narita.nq@hitachi-pt.com
Infrastructure Systems Company,
Hitachi, Ltd.
,603 Kandatsu-machi
,Tsuchiura-shi, Ibaraki-ken 300-0013
, Japan
e-mail: mitsuhiro.narita.nq@hitachi-pt.com
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Noriyo Nishijima,
Noriyo Nishijima
Planning Office,
Hitachi Research Laboratory,
e-mail: noriyo.nishijima.sj@hitachi.com
Hitachi Research Laboratory,
Hitachi, Ltd.
,1-1, Omika-cho 7 chome
,Hitachi-shi, Ibaraki-ken 319-1292
, Japan
e-mail: noriyo.nishijima.sj@hitachi.com
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Yohei Magara
Yohei Magara
Reliability Science Research Department,
Hitachi Research Laboratory,
e-mail: yohei.magara.bc@hitachi.com
Hitachi Research Laboratory,
Hitachi, Ltd.
,832-2 Horiguchi
,Hitachinaka-shi, Ibaraki-ken 312-0034
, Japan
e-mail: yohei.magara.bc@hitachi.com
Search for other works by this author on:
Naohiko Takahashi
Turbomachinery R&D Center
,Infrastructure Systems Company,
Hitachi, Ltd.,
603 Kandatsu-machi
,Tsuchiura-shi, Ibaraki-ken 300-0013
, Japan
e-mail: naohiko.takahashi.qb@hitachi-pt.com
Haruo Miura
Compressor Division,
Infrastructure Systems Company,
e-mail: haruo.miura.wm@hitachi-pt.com
Infrastructure Systems Company,
Hitachi, Ltd.
,603 Kandatsu-machi
,Tsuchiura-shi, Ibaraki-ken 300-0013
, Japan
e-mail: haruo.miura.wm@hitachi-pt.com
Mitsuhiro Narita
Compressor Division,
Infrastructure Systems Company,
e-mail: mitsuhiro.narita.nq@hitachi-pt.com
Infrastructure Systems Company,
Hitachi, Ltd.
,603 Kandatsu-machi
,Tsuchiura-shi, Ibaraki-ken 300-0013
, Japan
e-mail: mitsuhiro.narita.nq@hitachi-pt.com
Noriyo Nishijima
Planning Office,
Hitachi Research Laboratory,
e-mail: noriyo.nishijima.sj@hitachi.com
Hitachi Research Laboratory,
Hitachi, Ltd.
,1-1, Omika-cho 7 chome
,Hitachi-shi, Ibaraki-ken 319-1292
, Japan
e-mail: noriyo.nishijima.sj@hitachi.com
Yohei Magara
Reliability Science Research Department,
Hitachi Research Laboratory,
e-mail: yohei.magara.bc@hitachi.com
Hitachi Research Laboratory,
Hitachi, Ltd.
,832-2 Horiguchi
,Hitachinaka-shi, Ibaraki-ken 312-0034
, Japan
e-mail: yohei.magara.bc@hitachi.com
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 18, 2014; final manuscript received August 1, 2014; published online October 7, 2014. Editor: David Wisler.
J. Eng. Gas Turbines Power. Mar 2015, 137(3): 032509 (9 pages)
Published Online: October 7, 2014
Article history
Received:
July 18, 2014
Revision Received:
August 1, 2014
Citation
Takahashi, N., Miura, H., Narita, M., Nishijima, N., and Magara, Y. (October 7, 2014). "Development of Scallop Cut Type Damper Seal for Centrifugal Compressors." ASME. J. Eng. Gas Turbines Power. March 2015; 137(3): 032509. https://doi.org/10.1115/1.4028448
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