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| Numerical study on resistance enhancement of labyrinth seal by turbulence |
| Revised:July 17, 2003 |
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| DOI：10.7511/jslx20053066 |
| KeyWord:labyrinth seal,numerical simulation,resistance enhancement,turbulence |
| LIU You-jun |
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| Abstract: |
| The property of labyrinth seal relies on the throttling process in the clearances and the kinetic dissipation process in the cavities just behind the clearance, these two procedures play decisive roles in essential to the sealing property of the labyrinth. Study on the internal flow pattern of labyrinth seal is helpful for us to make use of some characters of turbulence in improving the sealing property. In the present paper, the flow field in a crenellated radial labyrinth seal is numerically studied, the flow pattern is obtained, and the relationships between the turbulent flow in the seal and the sealing properties are revealed. The numerical results show that there is an optimal teeth insert length for the sealing property. Under the condition of the optimal teeth insert length, although the throttling clearance is large, the inertial deflection and contraction of the jet flow through the clearance decreases the effective flow area of the clearance, thus the discharge medium can obtain higher velocity in the clearance and proper dissipating vortex can be formed in the cavity, so the seal reaches the best sealing property. We can conclude that by making use of the resistance enhancement by turbulence, better sealing property can be achieved under the condition of large clearance, which is of great importance to the design, manufacture and operation of labyrinth seal, and lays the theoretical foundations for new labyrinth seal techniques. |
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