A couple of nice turbine blade machining images I identified:
Image from page 251 of “Steam turbines a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine” (1917)
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Identifier: steamturbinespra00moye
Title: Steam turbines a sensible and theoretical treatise for engineers and students, which includes 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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Fig. 11 x. Section of a 4-stage Curtis Turbine Displaying Diaphragms and Blade Wheels. 232 THE STEAM TURBINE the steam velocity is decreased per pressure stage in proportion tothe number of rows of moving blades. Each and every stress stage issaid then to have as numerous velocity stages as there are rows ofmoving blades. It need to be noted, even so, that, in contrast to the caseof the Parsons turbine, the steam expands only in the nozzles,and the pressure is practically the same on each sides of any rowof blades. Nozzles. The nozzles are typically rectangular in cross-sec-tion, with rounded corners. They are grouped closely to-gether, becoming cast either integral with the diaphragms or inseparate plates (Fig. 114), which in assembling are bolted to thediaphragms. The quantity of nozzles is proportioned to the
Text Appearing Following Image:
Fig. 114. Nozzle Plates of Curtis Turbines. power necessary and the degree of expansion used in some instances,at least in the low-pressure stages, they extend totally aroundthe diaphragm, producing a continuous band of steam around thecircumference. This approach has the advantage of reducingblade rotation losses to a minimum, as explained in Chapter V.Steel, bronze alloys, and cast iron are employed for making thenozzles of Curtis turbines. Wheel Disks and Blades. The blade wheels are usually madeof forged steel disks equivalent to Fig. 216, which improve in thick- Commercial Types 233 ness as they approach the hub, but in bigger sizes the construc-tion shown in Fig. 113 is often employed. In some really smallturbines the blades are cut in the strong rim by specific machines,even though others have drawn or rolled blades which are cast intosegments (Fig. 115) of bronze alloy made to be riveted to therim. A dovetailing meth-od equivalent to Fig. 63 isnow typically preferredto the strategy of insertingt
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Image from page 383 of “Twentieth century hand-book for steam engineers and electricians, with queries and answers ..” (1905)
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Identifier: twentiethcentury03swin
Title: Twentieth century hand-book for steam engineers and electricians, with concerns and answers ..
Year: 1905 (1900s)
Authors: Swingle, C. F. [from old catalog] Horstmann, Henry Charles, 1858- [from old catalog] Tousley, Victor Hugo, 1875- [from old catalog]
Subjects: Steam engineering Electrical engineering Steam turbines
Publisher: Chicago, F. J. Drake & co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
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s the middle and lowersection. A portion of the inlet steam pipe is shown,ending in one particular nozzle group at the side. There arethree groups of initial nozzles, two of which are notshown. The revolving components of this unit are set upona vertical shaft, the diameter of the shaft correspond-ing to the size of the unit. For a machine obtaining thecapacity of the one particular illustrated by Fig. 134 the diameterof the shaft is 14 in. The shaft is supported by and runs upon a stepbearing at the bottom. This step bearing consists oftwo cylindrical cast iron plates, bearing upon eachother and obtaining a central recess in between them intowhich lubricating oil is forced below stress by asteam or electrically driven pump, the oil passing upfrom beneath. A weighted accumulator is sometimes 372 ENGINEERING installed in connection with the oil pipe as a con-venient device for governing the step bearing pumps,and also as a safety device in case* the pumps shouldfail, but it is seldom required for the latter purpose, as
Text Appearing After Image:
FIGURE 134. 5,000 K.W. CURTIS STEAM TURBINE DIRECT CONNECTED TO five,000 K.W. 3-PHASE ALTERNATING Current GENERATOR. the step bearing pumps have verified, following a longservice in a number of situations, to be reliable. Thevertical shaft is also held in place and kept steady bythree sleeve bearings, a single just above the step, onebetween the turbine and generator, and the other near THE CURTIS STEAM TURBINE 373 the best. These guide bearings are lubricated by astandard gravity feed technique. It is apparent that theamount of friction in the machine is really tiny, andas there is no finish thrust brought on by the action of thesteam, the relation in between the revolving and station-ary blades may possibly be maintained accurately. As a con-
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Please note that these images are extracted from scanned page photos that may possibly have been digitally enhanced for readability – coloration and appearance of these illustrations could not perfectly resemble the original operate.
Image from page 384 of “Twentieth century hand-book for steam engineers and electricians, with queries and answers ..” (1905)
Image by Net Archive Book Pictures
Identifier: twentiethcentury03swin
Title: Twentieth century hand-book for steam engineers and electricians, with questions and answers ..
Year: 1905 (1900s)
Authors: Swingle, C. F. [from old catalog] Horstmann, Henry Charles, 1858- [from old catalog] Tousley, Victor Hugo, 1875- [from old catalog]
Subjects: Steam engineering Electrical engineering Steam turbines
Publisher: Chicago, F. J. Drake & co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
View Book Page: Book Viewer
About This Book: Catalog Entry
View All Photos: All Photos From Book
Click here to view book on the web to see this illustration in context in a browseable on the internet version of this book.
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FIGURE 134. 5,000 K.W. CURTIS STEAM TURBINE DIRECT CONNECTED TO 5,000 K.W. 3-PHASE ALTERNATING Existing GENERATOR. the step bearing pumps have established, soon after a longservice in a quantity of instances, to be trustworthy. Thevertical shaft is also held in spot and kept steady bythree sleeve bearings, 1 just above the step, onebetween the turbine and generator, and the other close to THE CURTIS STEAM TURBINE 373 the best. These guide bearings are lubricated by astandard gravity feed technique. It is apparent that theamount of friction in the machine is extremely tiny, andas there is no finish thrust caused by the action of thesteam, the relation in between the revolving and station-ary blades might be maintained accurately. As a con-
Text Appearing After Image:
FIGURE 135. 500 K.W. CURTIS STEAM TURBINE IN COURSE OF Building. sequence, as a result, the clearances are reduced to theminimum. The Curtis turbine is divided into two or much more stages,and every stage has a single, two or a lot more sets of revolvingblades bolted upon the peripheries of wheels keyed tothe shaft. There are also the corresponding sets ofstationary blades, bolted to the inner walls of thecylinder or casing. As in the Westinghouse-Parsons 374 ENGINEERING sort, the function of the stationary blades is to givedirection to the flow of steam. Fig. 135 illustrates one particular stage of a 500 K. W. turbinein course of construction. It will be observed thatthere are 3 wheels, and that in the spaces betweenthese wheels the stationary buckets or vanes are
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Please note that these pictures are extracted from scanned page pictures that could have been digitally enhanced for readability – coloration and appearance of these illustrations may not perfectly resemble the original operate.