STEAM-TURBINE EXIT NOZZLE Russian patent published in 1998 - IPC

FIELD: steam outlet from flow path of steam turbine. SUBSTANCE: exit nozzle has header installed downstream of last runner in near-root zone of blades and connected to cooling steam source; header communicates with flow path through annular slit provided with guide vanes imparting tangential component to steam outflow unidirectional with rotation of runners. Header in this nozzle has guide vanes of geometry ensuring steam outflow beyond cone whose larger base circumference in described by peripheral points of exit edges of exhaust running blades and smaller base circumference closest to running blades, by points on exit edges of guide vanes. EFFECT: provision for preventing direct impact of cooling steam on running blades and escape of coarsely dispersed moisture from condenser. 2 cl, 4 dwg