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Aviation History
1954
1954 - 2106.PDF
23>/y 1954 On the left is shown a com plete combustion chamber and upstream burner; a half locking-ring and turnbuckle is visible on each casing. Right, the extraordinarily efficient 14:1 reduction gear, withdrawn from the annulus gear to reveal the torque- meter construction. ~-3' 115 ,v ANn AIRSCREW STARTER VARIABLE INLET NG Ai» GOVERNOR UNIT / GUIDE VANES IDLER IN TOP TOP ACCESSORY ACCESSORY TRAIN AND STARTER DRIVE TORQUE RING ANNULUS GEAR FILTERED, PRESSUR AIR FOR OIL SEAL LUBRICATION OIL JET FOR BEVEL DRIVE y-MM. o • »ii • 1 EPICYCUC GEAR CAR iNP . PIN AIRSCREW-ACTUA' OIL SUPPLY wmm. AIRSCREW SI THRUST BEAt *A- (TERING ELECTRICAL JUNCTION BOX STAGE AXIAL MPRESSOR ENGINE OIL TORQUEMETER PUMP PRESSURE PUMP REDUCTION-GEAR SHAFT COUPLING TORQUEMETER SHUTTLE VALVE REDUCTION GEAR LAYSI ASSEMBLY ( SCAVENGE OIL FILTER INTAKE ANTI-ICED BY HOT OIL IN 6 OIL COOLER CHAMBERS TORQUEMETER (FRONT COVER REMOVED) [4PIFH FI A MO from cnd of mc engine is 11 IliU 1*1JA1I1F ... formed from a large casting in RZ-5 magnesium alloy, which houses the reduction gear and incorporates the intake and six radial spats, two of which house the cover drives. The intake has a 2:1 area ratio, resulting in an accelerating flow which preserves laminar characteristics and prevents break-away from the radial spats. To afford complete protection against ice, the inner wall of the intake is warmed by oil splash from the reduction gear, and the outer wall is heated by eight oil jackets through which the scavenge oil is pumped before it is returned to the pressure side of the lubrication system. Each jacket is formed from a thin magnesium-alloy casting, ribbed for strength, Argonarc-welded along its edges to the outside of the intake casting. A single flow of oil passes alternately through the jackets and the leading edges of die radial spats; in warming the intake the oil is itself cooled sufficiendy to obviate the need for a separate oil-cooler, so saving weight and complication and eliminating cooling drag. At the rear of the intake is a row of variable-incidence guide vanes which are anti-iced by fifth-stage air from the compressor; this air is passed into the leading edge of each vane to the outer end and back down the trailing edge to exhaust into the main stream at the inner diameter, where it impinges against the leading-edge root of the first-stage rotor blades. Discussion of these vanes, hereafter referred to as v.i.g. vanes, will be resumed later. The Napier company are justifiably proud of the Eland com pressor, which is small and light and has exceeded its design pressure ratio of 7:1 at a mass flow of 31 lb/sec widi only ten stages of blading. The hub/tip ratio is 0.7, this being a com promise resulting in the moderate maximum r.p.m. of 12,500. The rotor assembly is built up of conventional single discs held in flank-fitting splines on the large-diameter tubular rotor shaft of S.107 steel; discs one to seven are of aluminium alloy and the last three are steel. All fixed and moving compressor
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