Boeing, GE Define 777 Performance Upgrade

Boeing, GE Define 777 Performance Upgrade

Image from web page 388 of “Railway mechanical engineer” (1916)
compressor blade machining
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Identifier: railwaymechanica89newy
Title: Railway mechanical engineer
Year: 1916 (1910s)
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York, N.Y. : Simmons-Boardman Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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Text Appearing Ahead of Image:
eller is constructed up on a disc of heat-treated chrome- T- 1 ^^ — Ss: ~2^^ ^^ – ^=^ 5^ I, jC N&gt ^ X Z ^ V s» ^ ^ ^^ / — ° !S ~~£^=. I / ^^t ■ K – V ^ ^. 7 ^-^^ – N ^ ^ ^ S I 7 ^ ^t^ ^.? 7 r Qualities of De Laval Single Stage IVIotor-Driven Btcwer nickel steel, thickened at the center tn type a hub. and also toturn the air which enters axially to a radial direction with theleast shock. 1 side of every single blade or vane is riveted directjyto this disk, even though the other is riveted to a steel side plate ofthe identical material as the hub and also turned tapering to combinestrength and lightness. The entrance edges of the blades areset at such an angle as to acquire the air with no shock and areformed to give the desired qualities. Attached to the sideplate is a ring which meshes with a corresponding groove in theinlet ring, as a result forming a labyrinth packing which minimizesleakage from the discharge past the impeller back !■■ the suction.

Text Appearing Following Image:
-Stage De Laval Centrifugn by Multi-stage Turbine 376 RAILWAY A(E gazette, Ml-.CUAXICAI ■:niTiox oi,. 89, io. Tile shaft is iiiaiie from particular haiiiiiier-furgcd, npfii-hearth steelof a high tensile strength and uniform texture, ground in deadcenter grinders to insure absolute accuracy of dimensions, per-fect centering and high finish. These machines are employed fi^r pressures ranging from fourto six inches water column up to 3 to 4 pounds persquare inch. The form of the head-delivery characteristic cantie modilied according to the work to l)e carried out. The casing of the multi-stage compressor is split horizontally,permitting the top half or cover to be lifted oflf so that internalparts might lie inspected and lifted out following the removal of thebearing caps The impellers are mounted upon a shaft of largediameter, the critical speed of which is far above the runningspeed. It is created from hammer-forged open-hearth steel, suita-bly heat treated and ground and polished over the en

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Boeing, GE Define 777 Efficiency Upgrade
The most substantial single change in the engine upgrade is an improvement to the active clearance control system which cools the casing of the high-stress turbine section, assisting to lessen clearances between the tips of the blades and the shroud&nbsp…
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Upgrading Two Pumped Storage Plants to Variable Speed
Typically, the decrease pump energy limit is set by an instability location exactly where it is not possible to operate (known as the hump zone) or by the cavitation limit on the suction side of the runner blades. The high energy limit is defined by the cavitation …
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