Single-shaft, heavy-duty industrial gas turbines are extremely sensitive to compressed air bypassing at compressor discharge plane. This plane represents the highest pressure location in entire gas turbine unit (GTU). Standard method to minimize compressed air leakage is labyrinth seal that is integral part of the cylindrical element here called “inner barrel.” The inner barrel is also the part of compressor discharge diffuser. This paper describes the efforts related to conversion of standard labyrinth seal into the hybrid seal that is combination of labyrinth and brush seals.

1.
Bartlett, R. L., and Hegetschweiler, H., 1957, “Predicting Performance of Large steam Turbine-Generator Units,” Trans. ASME.
2.
Chinaeff, “Sydovye Gazovye Turbini” Transport, 1964, Moscow, Russia.
3.
Crane, 1942, “Flow of Fluids” Technical Paper No. 409, May.
4.
Gryzaya, L. L., 1965, “Sparavochnic Sudovogo Mechanika” Transport, Moscow, Russia.
5.
Ingistov, S., Meredith, G., and Sulda, E., 2000, “Brush Seals For the No. 3 Bearing of a Model 7EA Gas Turbine,” IGTI, Munich 2000 ASME Paper No. 2000-GT-558.
6.
Ingistov, S., 1999, United States Patent No. 5,961,279 “TURBINE POWER PLANTS HAVING MINIMAL-CONTACT BRUSH SEAL AUGMENTED LABYRINTH SEAL” Oct.
7.
Marks, “Standard Handbook for Mechanical Engineers,” 9th Edition.
8.
Scheel, L. F., 1969, “New Ideas on Centrifugal Compressors,” Part No. 1, Compressor Handbook, Gulf Publishing Company Houston, TX.
You do not currently have access to this content.