Abstract
Steam turbine efficiency can be improved by large diameter, high speed stages, provided seal leakage and friction, and wheel windage losses can be contained. This paper describes analysis and design of a steam-lubricated seal applied to a single stage experimental turbine designed for improved efficiencies over conventional types. Proper performance of the seal is vital to overall turbine performance. The seal is subjected to surface speeds of approximately 75,000 fpm and up to 100 psi pressure differential. A sectored fluid film seal that uses hydrostatic steam secondary seals was found to be the best candidate configuration. The sectored seal is considered optimum for tracking capability, although there are limitations on the amount of collar nutation permitted. A description of the computerized steady-state and dynamic analyses are described in an appendix. Presented at the 25th ASLE Annual Meeting in Chicago, May 4–8, 1970
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