This paper focuses on the casing geometry of high pressure compressors. It is common practice to use damper seals, typically the hole pattern type, at the balance piston to ensure the stability of the compressor when compressing fluids with high density levels. Special attention must be paid to the clearance of the hole pattern seal, which must be kept convergent at all operating conditions because a clearance divergence can lead to a rotor dynamic instability of the compressor. Furthermore, the clearance must be kept as low as possible to reduce the leakage losses through the balance piston. Therefore, extensive fine element analyses are performed to determine the mechanical casing deflections in operation and hence, the correct clearance behavior of such damper seals. This paper discusses the history of the casing design during the last 10 years and compares the configurations with respect to the clearance distribution along the damper seal length. To validate the analytical predictions, leakage and stability measurements (using a magnetic shaker) are performed for these high pressure compressors during the full-load, full-pressure testing. This paper presents the stability measurements carried out on two compressors (390 bars and 655 bars discharge pressure) and compares the results.
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July 2011
Research Papers
Improving the Design of a High Pressure Casing With the Help of Finite Element Analysis to Ensure the Rotor Dynamic Stability of a High Pressure Centrifugal Compressor Equipped With a Hole Pattern Seal
Urs Baumann
Urs Baumann
Head of Calculation and Development
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Yves Bidaut
Manager Mechanical Development
Urs Baumann
Head of Calculation and Development
J. Eng. Gas Turbines Power. Jul 2011, 133(7): 072502 (8 pages)
Published Online: March 10, 2011
Article history
Received:
April 9, 2010
Revised:
April 13, 2010
Online:
March 10, 2011
Published:
March 10, 2011
Citation
Bidaut, Y., and Baumann, U. (March 10, 2011). "Improving the Design of a High Pressure Casing With the Help of Finite Element Analysis to Ensure the Rotor Dynamic Stability of a High Pressure Centrifugal Compressor Equipped With a Hole Pattern Seal." ASME. J. Eng. Gas Turbines Power. July 2011; 133(7): 072502. https://doi.org/10.1115/1.4002656
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