Accession Number : ADP000361

Title :   Measurement and Evaluation of Swirl-Type Flow in Labyrinth Seals of Conventional Turbine Stages,

Corporate Author : TECHNISCHE UNIV MUNICH (GERMANY F R) INST FUER THERMISCHE KRAFTANLAGEN

Personal Author(s) : Hauck,L.

Report Date : 1982

Pagination or Media Count : 18

Abstract : Previous studies of rotor whirl instability pointed out two different mechanisms inducing lateral forces within non-contacting labyrinth-type seals. Evaluating the part of exciting forces that results from leakage losses is possible by means of variable flow contraction in the gap of a seal with variable clearance at the circumference. The dominating part of exciting forces has its origin in unequal pressure distributions at the circumference of the seal with a shaft in out-of-centre position. The pressure distribution is mainly influenced by swirl-type flow at seal entry.

Descriptors :   *Turbomachinery, *Sealed systems, *Fluid flow, *Vibration, *Workshops, Measurement, Fluid flow, West Germany

Distribution Statement : APPROVED FOR PUBLIC RELEASE