Design of a High-Speed Steam Engine; Notes, Diagrams, Formulas and Tables

Design of a High-Speed Steam Engine; Notes, Diagrams, Formulas and Tables

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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. 1903 edition. Excerpt: ...distribution given by Table XIV with that given by Fig. 63. An ordinary D valve is usually set by giving it equal leads at the dead points of the crank; but this makes every other occurrence of the steam distribution take place unequally for the two strokes. We have already pointed out that there is no necessity for equality of lead; that the lead may be unequal provided the minimum value is sufficient to maintain the steam pressure, and cushion properly; nor is a positive lead necessary, there are cases when a negative lead is justifiable and desirable. Engine makers lay some stress upon, having the indicator cards from the two cylinder ends look alike. Equality of cut-off has more influence on this than any other factor. For this reason and not because equality of cut-off is necessarily conducive to smooth running, we will give a method for finding the unequal laps and the angle between eccentric and crank when the cut-off is equalized for both strokes, say, made equal to 0.8. In Fig. 64 take the distance OO' equal to the sum e + e' of the laps at the two ends, and on stroke AB and A'B' describe crank-pin circles. Strike off the equal and parallel arcs BK and A'R with a radius equal to the connecting-rod, as in Fig. 63. Make KL--RS = 0.8 X AB. In the neighborhood of L draw a series of perpendiculars to OO' which cut the lower part of crank-pin circle BLA at points -, ... -4. Then with 5 as a center, and the distances, Lul, L1t?, Luv Lu4, etc., as radii, strike off the arcs that will cut the corresponding perpendiculars through -, u2, -3, -4, etc., at the points xl, xQ, x3, x1. Join these intersections by a curve h. It will cut at /the other circle on A'B'. From this point M drop another perpendicular MN to OO' more

Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236655710
  • 9781236655714