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Abstract:
Experimental results are presented for the direct and cross-coupled stiffness and damping coefficients as well as the leakage performance for a 4- stage brush seal. Variable test parameters include the inlet pressure, pressure ratio, shaft speed, fluid pre-rotation, and seal spacing. Direct damping is shown to increase with running speed; otherwise, the rotordynamic coefficients are relatively insensitive to changes in the test parameters. Cross-coupled stiffness is generally unchanged by increasing the inlet tangential velocity to the seals, suggesting that the brush seal is not effected by inlet swirl. Direct stiffness is shown to increase with frequency; however, the magnitudes of direct stiffness are always positive. Cross-coupled stiffness increases slightly with frequency, yet not as drastically as direct stiffness. Comparisons of test results for the 4-stage brush seal with an 8-cavity labyrinth showed superior rotordynamic performance for the brush seal, viz., larger values for direct stiffness and damping and lower values for the (destabilizing) cross-coupled stiffness coefficient.
| Description: |
Final rept. Oct 88-Aug 90 |
| Pages: |
147 |
| Report Date: |
DEC 90 |
| Contract Number: |
F33615-88-C-2908 |
| Report Number: |
A633532 |
Report Unavailable |
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