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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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
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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| Summary: | 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. |
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| ISSN: | 1023-621X 1542-3034 |