Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting
<p>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 i...
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| Format: | Article |
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| Language: | English |
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Wiley
2006-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://www.hindawi.com/GetArticle.aspx?doi=10.1155/IJRM/2006/93621 |
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| collection | DOAJ |
| description | <p>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.</p> |
| format | Article |
| id | doaj-art-7df625d7d7bf4e48818923c6b45782b0 |
| institution | Kabale University |
| issn | 1023-621X |
| language | English |
| publishDate | 2006-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-7df625d7d7bf4e48818923c6b45782b02025-02-03T05:45:04ZengWileyInternational Journal of Rotating Machinery1023-621X2006-01-012006Rotordynamics of Turbine Labyrinth Seals with Rotor Axial Shifting<p>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.</p>http://www.hindawi.com/GetArticle.aspx?doi=10.1155/IJRM/2006/93621 |
| spellingShingle | 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://www.hindawi.com/GetArticle.aspx?doi=10.1155/IJRM/2006/93621 |