The Engineer's Practical Guide, and the Working of the Steam Engine Explained by the Use of the Indicator

The Engineer's Practical Guide, and the Working of the Steam Engine Explained by the Use of the Indicator

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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. 1875 edition. Excerpt: ...on the piston. The low pressure cylinder, with a terminal pressure of 4731bs, and the cut-off at two-thirds of the stroke, will give an average of 6-6451bs, from which we deduct 21bs back pressure (making it equal to a vacuum of 131bs), giving an average effective pressure of 4-6451bs. The result can now be expressed by the equations, 83000 Together making = 144-018 H.P. The measurement of steam used to the point of cut-off in the high pressure cylinder was one 6-2 (or 0-1613) of 60 inches = 9677 inches X 306 in area = 2,961 cubic inches. Let us now see what will be the power given out by the same initial pressure of steam, the same cubic capacity, and the same ratio of expansion, and therefore the same terminal pressure, --arranged according to the rule of proportion for Compound Engines given in chapter on compounding. The low pressure being taken as the standard for the power required, the cylinder will be 900 inches area as before. As the steam is expanded 18 times, the high pressure cylinder will require to be 210 inches area, and the point of cut-off will be one 425 or at 1411 inches. This will give 2,961 cubic inches measurement as before. Then 851bs initial pressure, cut off at one 425, will give a terminal pressure of 201bs, and an average absolute pressure of 48'94lbs. The low pressure cylinder being 425 times the area of the high pressure cylinder, and the steam being cut off at one 425, the initial pressure will coincide with the terminal pressure in the high pressure cylinder, and will also be the amount of back pressure there. The initial pressure in the low pressure cylinder being 201bs, and cut off at one 425, the average pressure will be i151bs. The average absolute pressure of the high pressure cylinder being 48-941bs--201bs more

Product details

  • Paperback | 116 pages
  • 189 x 246 x 6mm | 222g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236499034
  • 9781236499035