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Sothern, J: Marine Steam Turbine

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O knihe

Excerpt from The Marine Steam Turbine: A Practical Description of the Parsons Marine Turbine as Presently Constructed, Fitted, and Run; Intended for the Use of Students, Marine Engineers, Superintendent Engineers, Draughtsmen, Works' Managers, Foremen Engineers, and Others

Since the issue of the previous edition of this work a number of improvements have developed in relation to marine steam turbine design, the most outstanding being, perhaps, the introduction of gearing between the propeller driving shaft and the turbine to obtain the maximum efficiency of both turbine and propeller independently. Recently, the combined impulse and reaction turbine has also come extensively into marine use, and has given very satisfactory results, particularly in the case of high speed naval vessels.

In Government work a large percentage of the vessels in commission and under construction are fitted with brown-curtis type impulse turbines, this design offering special advantages for the conditions obtaining in naval practice. The Parson's geared-down turbine appears to be gradually displacing both the combined reciprocating and turbine arrangement and the direct drive turbine, as the gearing has given every satisfaction under severe service conditions in steamers of large displacement and power: the innovation may therefore be looked upon as having come to stay. Regarding the present edition of the Marine Steam Turbine, it has to be stated that the new matter and illustrations introduced (sections V.-XV.) refers chie¿y to impulse turbines'and geared-down turbines; in addition to this, a short section has been given over to the discussion of entropy, a subject not of such common knowledge among marine engineers as might be desired.

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