Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine (1917) (14778888051)

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

Text Appearing Before Image:

les can be seen in each diaphragm. At the high-pressureend of the turbine there are only a few groups (usually aboutthree), but in each succeeding stage there is a greater number.Because the steam discharged from the blades is carried along ashort distance by the rotation of the wheel, a portion of eachgroup of nozzles is located a little in advance of the precedingset. COMMERCIAL TYPES 249 One of the advantages claimed by Rateau for multi-stagetypes over those in which the steam is admitted around the wholeperiphery in all the stages, is that since the volume of the steam y^-- 1 : Fig. 133. Diaphragms of a Rateau Turbine Showing Nozzles and aShaft Packing with Water Grooves. at the admission end is small, the blades, in the Parsons type forexample, have necessarily a small radial height, so that there ismore friction due to the passage of steam than where the steamspaces are larger and the volume of the steam is large in pro-portion to the surface of the blades. 250 THE STEAM TURBINE

Text Appearing After Image:

COMMERCIAL TYPES 251 Description. Fig. 134 is a section of a 500-horsepower Ridg-way-Rateau turbine of seven stages. It will be observed thatthis turbine is a remarkably simple design. This turbine is de-signed to operate at 2400 revolutions per minute. In this figurethe main steam pipe is shown at the bottom of the casing.From this pipe the live admission steam is discharged into thecored passages supplying the first stage nozzles after passingthrough the throttle valve controlled by the governor. Theexhaust pipe leading to the condenser is cast integral with the

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1917

Library of Congress

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