This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...Correction Curves. Typical curves showing the variation in steam consumption of a 500-kilowatt Curtis turbine due to increasing superheat and vacuum are shown in Figs. 126 and 127. Such curves become most useful, however, when they are reduced to equivalent percentages like those for De Laval turbines ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...Correction Curves. Typical curves showing the variation in steam consumption of a 500-kilowatt Curtis turbine due to increasing superheat and vacuum are shown in Figs. 126 and 127. Such curves become most useful, however, when they are reduced to equivalent percentages like those for De Laval turbines shown on pages 150 and 151. In Chapter VI the correct method for making this transposition was explained. Fig. 126. F1g. 127. Curves Showing the Effect of Superheat and Vacuum on the Steam Consumption of a 500-Kilowatt Curtis Turbine. Steam Consumption. Fig. 128 is a curve to show approximately the steam consumption of any size of Curtis turbine at the rated full load. All the data for this curve were corrected by using percentage curves like those referred to above, which served 1000 2000 mo 4000 0000 0000 7000 Rated Full Load Output-Kw. Fig. 128. Approximate Steam Consumption of Any Size of Curtis Turbine with 165 Pounds per Square Inch Absolute Pressure, 28 Inches Vacuum, and no Superheat. co reduce the conditions of the various tests to assumed conditions of 165 pounds per square inch absolute steam pressure, 28 inches vacuum, and no superheat. To get sufficient data for this curve it was necessary to include some tests made with commercial loads, making its values probably a little higher than they would be if all the tests had been run with a constant load. Analysis of Losses. Steinmetz has calculated the energy distribution in a typical two-stage Curtis turbine and has given the results in the form of the diagram in Fig. 129. Fig. 129. Analysis of the Losses in a Turbine with Three Veloc ity Stages in Each of Two Pressure Stages. RATEAU TURBINES. Professor Rateau of Paris is also a pioneer in the development of a well-known type of...
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