Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting
Rotors in high-performance steam turbines experience a significant axial shifting during starting and stopping processes due to thermal expansion, for example. This axial shifting could significantly alter the flow pattern and the flow-induced rotordynamic forces in labyrinth seals, which in turn, c...
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| Format: | Article |
| Language: | English |
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Wiley
2006-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/IJRM/2006/93621 |
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| _version_ | 1832558705260888064 |
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| author | Jinxiang Xi David L. Rhode |
| author_facet | Jinxiang Xi David L. Rhode |
| author_sort | Jinxiang Xi |
| collection | DOAJ |
| description | Rotors in high-performance steam turbines experience a significant
axial shifting during starting and stopping processes due to
thermal expansion, for example. This axial shifting could
significantly alter the flow pattern and the flow-induced
rotordynamic forces in labyrinth seals, which in turn, can
considerably affect the rotor-seal system performance. This paper
investigates the influence of the rotor axial shifting on leakage
rate as well as rotordynamic forces in high-low labyrinth seals
over a range of seal clearances and inlet swirl velocities. A
well-established CFD-perturbation model was employed to predict
the rotordynamic coefficients. A surprisingly large effect was
detected for rotordynamic characteristics due to rotor shifting.
It was also found that a less destabilizing effect arose from
rotor axial shifting in the leakage flow direction, whereas a more
destabilizing effect arose from shifting against the leakage flow
direction. Further, a tentative explanation was proposed for the
large sensitivities of dynamic forces to rotor axial shifting. |
| format | Article |
| id | doaj-art-0ddd2f5a4b3c4dbd86a9f0776b797389 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2006-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-0ddd2f5a4b3c4dbd86a9f0776b7973892025-02-03T01:31:41ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342006-01-01200610.1155/IJRM/2006/9362193621Rotordynamics of Turbine Labyrinth Seals with Rotor Axial ShiftingJinxiang Xi0David L. Rhode1Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USADepartment of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USARotors in high-performance steam turbines experience a significant axial shifting during starting and stopping processes due to thermal expansion, for example. This axial shifting could significantly alter the flow pattern and the flow-induced rotordynamic forces in labyrinth seals, which in turn, can considerably affect the rotor-seal system performance. This paper investigates the influence of the rotor axial shifting on leakage rate as well as rotordynamic forces in high-low labyrinth seals over a range of seal clearances and inlet swirl velocities. A well-established CFD-perturbation model was employed to predict the rotordynamic coefficients. A surprisingly large effect was detected for rotordynamic characteristics due to rotor shifting. It was also found that a less destabilizing effect arose from rotor axial shifting in the leakage flow direction, whereas a more destabilizing effect arose from shifting against the leakage flow direction. Further, a tentative explanation was proposed for the large sensitivities of dynamic forces to rotor axial shifting.http://dx.doi.org/10.1155/IJRM/2006/93621 |
| spellingShingle | Jinxiang Xi David L. Rhode Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting International Journal of Rotating Machinery |
| title | Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting |
| title_full | Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting |
| title_fullStr | Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting |
| title_full_unstemmed | Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting |
| title_short | Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting |
| title_sort | rotordynamics of turbine labyrinth seals with rotor axial shifting |
| url | http://dx.doi.org/10.1155/IJRM/2006/93621 |
| work_keys_str_mv | AT jinxiangxi rotordynamicsofturbinelabyrinthsealswithrotoraxialshifting AT davidlrhode rotordynamicsofturbinelabyrinthsealswithrotoraxialshifting |