The Steam Turbine as Applied to Marine Purposes; A Series of Lectures Delivered Before the Royal Scottish Society of Arts in Edinburgh, February to March 1906

The Steam Turbine as Applied to Marine Purposes; A Series of Lectures Delivered Before the Royal Scottish Society of Arts in Edinburgh, February to March 1906

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...12 per cent. slip ratio and in the four-bladed to 13 per cent. slip ratio. Of course the value of the maximum efficiency will vary very much with pitch ratio, but the position of it in relation to slip will not alter. It may be interesting to notice that as between the threeand four-bladed propellers, while maximum efficiency occurs at about the same slip ratio, i.e. at about the same revolutions in the same diameter propellers, that the corresponding area ratios are '27 and-36, the excess of the latter over the former being simply that due to the extra blade, viz. about one-third. The effect of this extra blade only seems to be to detract from efficiency, as it lowers the maximum possible from 80 per cent. in the three-bladed to 75 per cent, in the four-bladed. It has been shown that the values of S increase with decrease in pitch ratio, i.e. increase of diameter ratio, ranging in four-bladed propellers having narrow blades (of, say, area ratio 17) from-1 at pitch ratio of 1-6 to l-0 at pitch ratio of-4, and in broad blades (say, of area ratio of-65) from Slip per Cent Fig. 95. Model Propeller Experiments. 4 Blades. '125 Width ratio. "E," Curves of efficiency for constant value of "S." 'P," Curves of pitch ratio for constant value of " 3." "1 to 2"0. These are very significant figures, and show the wide range of power absorption of different propellers. The value of S, except for small areas, increases with increase of area ratio for the same pitch ratio, the rate of increase being much greater for small pitch ratios than for large. Taking these two statements together, it is seen that to get a large value of S small pitch ratios and large area ratios are necessary. Having described these curves we...show more

Product details

  • Paperback | 38 pages
  • 185.42 x 238.76 x 5.08mm | 68.04g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236638492
  • 9781236638496