Aviation Week and Space Technology Volume 8

Aviation Week and Space Technology Volume 8

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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. 1920 edition. Excerpt: ... engine can do, and the fuel eonsumption curve tells the price it exacts for doing it, while the brake mean-effective-pressure curve furnishes a measure of performance from which the size of the engine has beeu eliminated. Friction horsepower measurements show the power expended in overcoming internal friction and pumping losses. Adding these to the brake horsepower gives the quantity termed indicated horsepower, the approximate power developed in the engine cylinders. This measurement often explains the superiority of one engine over another, although it is always by the brake-horsepower measurement that such superiority is first determined. In Fig. 3 the usual efficiencies are given, namely thermal, expressing the degree to which the heat energy in the fuel is converted into brake horsepower; mechanical, giving the degree with which the power developed in the cylinder appears as brake horsepower, and volumetric, the pumping efficiency of the engine in drawing in its charge. A complete report of a test of this sort, would include many curves omitted here, since they serve primarily as intermediate steps in locating others. Thus, plots of pounds of fuel per hour and pounds of air per hour aid in locating the air-fuel ratio curve shown on Fig. 4. Heat balances have been plotted with brake horsepower as a base, as well as with the conventional base, the heat in the fuel. To the designing engineer, the former method is of advantage in that it presents the heat distribution directly in terms of brake horsepower, a quantity which forms the starting point for much of his design work. The brake horsepower and brake mean-effective-preasure given in Fig. 1 have been converted to standard barometric pressure by multiplying the original values by the ratio...show more

Product details

  • Paperback | 140 pages
  • 189 x 246 x 8mm | 263g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236516885
  • 9781236516886