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| Fig. 9-5 A hypothetical turbine cooling and sealing arrangement. |
SEALING :
12. Seals are used to prevent oil leakage from the engine bearing chambers, to control cooling airflows
and to prevent ingress of the mainstream gas into the turbine disc cavities.
13. Various sealing methods are used on gas turbine engines. The choice of which method is
dependent upon the surrounding temperature and pressure, wearability, heat generation, weight, space
available, ease of manufacture and ease of installa- tion and removal. Some of the sealing methods are
described in the following paragraphs. A hypothetical turbine showing the usage of these seals is shown in
fig. 9-5.
