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1. IN10691/DELNP/2013 - VARIABLE PITCH NOZZLE FOR A RADIAL FLOW TURBINE IN PARTICULAR FOR A TURBINE OF AN AUXILIARY POWER SOURCE

Office India
Application Number 10691/DELNP/2013
Application Date 12.12.2013
Publication Number 10691/DELNP/2013
Publication Date 26.12.2014
Publication Kind A
IPC
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01
MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
D
NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
17
Regulating or controlling by varying flow
10
Final actuators
12
arranged in stator parts
14
varying effective cross-sectional area of nozzles or guide conduits
16
by means of nozzle vanes
F01D 17/16
Applicants TURBOMECA
Inventors DEMOLIS Jacques
MINEL Laurent
VIGNAU Hubert
Priority Data 1154801 01.06.2011 FR
Title
(EN) VARIABLE PITCH NOZZLE FOR A RADIAL FLOW TURBINE IN PARTICULAR FOR A TURBINE OF AN AUXILIARY POWER SOURCE
Abstract
(EN)
The aim of the invention is to modify the reduced flow intake of a radial flow turbine in accordance with the needs of the thermodynamic cycle and to provide a seal in the area of maximum load of the blades of the nozzle. For this purpose the invention proposes that the blades have a specific positioning. According to a preferred embodiment the nozzle of the radial flow turbine of a turbine engine (7) which rotates about a central axis (X X) comprises a first annular grille (G1) having fixed pitch blades (2a) and a second annular grille (G2) having the same number of variable pitch blades (2b). The blades (2a 2b) have pressure (Fi) and suction (Fe) sides. Each variable pitch blade (2b) is secured to cups (24a 24b) and is capable of being rotated by a control means (40) about a geometric axis (R R) connecting the centres (2A 2B) of the cups (24a 24b). Each variable pitch blade (2b) is mounted so as to be spaced apart from the axis (R R) of the cups (24a 24b) such that said axis of rotation (R R) is positioned opposite the suction side (Fe) of the blade (2b) and substantially closer to the trailing edge (Bf) than to the leading edge (Ba) of said blade (2b).