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Aviation History
1949
1949 - 1430.PDF
194 FLIGHT TURBINE- INTERSTAGE MOUNTING STATOR BLADES SPIDER TURBINE ENTRY RING MOUNTING (TO AIRCRAFT) COMPRESSOR MOUNTING LINK COMPR ROTOR COOLING SHROUDS TURBINE OUTLET DUCT HEAT INSULATOR (ALUMINIUM FOIL) AIRSCREW, TURBINE (3rd STAGE) COMPRESSOR TURBINE (1st TWO STAGES; FIRST-STAGE STATOR BLADES MAX. AIRSCREWTURBINE SHAFT COMPRESSOR TURBINE SHAFT AIRSCREW DRIVE-SHAFT COUPLING COMPRESSOR TURBINE COUPLING AIRSCREW DRIVE-SHAFT Bristol Proteus through the central bore of the disc. From the forward end of the bore it passes between the flange of the airscrew turbine shaft and the hub of the disc, through grooves in the junction face and thence up the forward face of the disc. For the rear of the third-disc .air from the sixth-stage tapping is delivered as a jet into the open central mouth of the shroud arranged adjacent to the rear face. In addition to cooling the turbine discs these air supplies, which reach the wheel discs at pressures slightly higher than those of the gases at their particular stage, serve as seals AIRSCREW TURBINE OPPRESSOR TURBINE AXIAL COMPRESSOR CENTRIFUGAL COMPRESSOR REDUCTION GEAR I I I I I I INT TOOTHED COUPLINGS between the blade roots and the nozzles and prevent the escape of hot gas to the interior. Some idea of the importance and magnitude of the blade- production problem on turbine units may be gained from an examination of the Proteus. On the axial compressor there are twelve rows each of 69 blades with fir-tree roots for the rotor and, including the entry guide vanes, thirteen rows each of 70 blades with dovetail roots for the stator. This gives a total of 1,738 die-pressed, light-alloy blades. Three turbine wheels each carry 127 nickel-chrome alloy blades machined from the solid bar, thus totalling 381 blades per unit. Turbine nozzle blades, also of nickel-chrome alloy, are cast in groups of seven for the first stage and of three for the succeeding stages. There are. 112 blades in the first stage and 48 in each of second and third stages, making in all 208 blades in 48 castings. The sum total is thus 2,327 blades (or 2,167 items) in three different materials and manufactured by three differ- ent production techniques. ANNULUS 'GEAR AIRSCREW SHAFT TOOTHED COUPLING Diagrammatic assembly of the rotatingcomponents connected by toothed couplings.
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