Identifier: steamturbinespra00moye (find matches)
Title: Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine
Year: 1917 (1910s)
Authors: Moyer, James Ambrose, 1875-
Subjects: Steam-turbines
Publisher: New York, Wiley
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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on, and is deflected radi-ally by the two sets of buckets a and c on the wheel. Steamenters the nozzles from the steam chest S. Relative positions ofnozzles and buckets are illustrated diagrammatically in Fig. 156.Actually in the turbine the horizontal lines in this figure are, ofcourse, arcs of circles. The steps shown here in the wall ofthe bucket ring are intended to bring the surfaces upon whichthe steam impinges nearer to the nozzles and to present alwaysapproximately the same angle to the flow of steam. The nozzles are designed with the object of delivering the steamto the buckets in parallel jets. Throughout their lengths thenozzle walls are the same distance apart, and expansion is securedby the use of expansion wedges, shown plainly in both figures,which are set centrally in the nozzles. These wedges can bereadily removed and replaced, so that it is not difficult to inserta wedge properly proportioned to give the best expansion for agiven steam pressure. 270 THE STEAM TURBINE
Text Appearing After Image:
W>^ M O a GO COMMERCIAL TYPES 271 SPIRO TURBINES.*The Spiro turbine (Fig. 157) consists simply of two herringbonegear wheels which mesh together and revolve in a close-fittingcasing. Steam enters at the inlet pipe at the bottom and passesaround the gears in its expansion to the exhaust pipe at the top.Steam discharges from the inlet pipe through the small holes,equivalent to non-expanding nozzles shown in Figs. 158 and 159,into the pockets or spaces between adjacent gear teeth. As

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