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Home > Science, Technology & Agriculture > Technology: general issues > Engineering: general > Steam Engines; A Thorough and Practical Presentation of Modern Steam Engine Practice
Steam Engines; A Thorough and Practical Presentation of Modern Steam Engine Practice

Steam Engines; A Thorough and Practical Presentation of Modern Steam Engine Practice


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Excerpt: ...thus bringing the admission and expansion lines into the lower positions, as shown in dotted lines. The shaft governor is used almost universally on high-speed engines, and is shown in one form in Fig. 37 . It consists, in this case, of two weights W, hinged to the spokes of the wheel near the circumference 30 by means of suitable arms. Attached to the arms, as shown, are coil springs C. The ends of the arms beyond the weights are connected by means of levers L to the eccentric disk. When the engine speeds up, the weights tend to swing outward toward the rim of the wheel, the amount of the movement being regulated by the tension of the springs C. As the arms move outward, the levers at the ends turn the eccentric disk on the shaft, the effect of which is to change the angle of advance and shorten the cut-off. When the speed falls below the normal, the weights move toward the center and the cut-off is lengthened. The effect of this form of governor on the diagram is shown in Fig. 39 . The full line represents the diagram at full load, and the dotted line when the engine is under-loaded. Fig. 37. Shaft Governor for High-speed Engine Fig. 38. Action of Throttling Governor on Indicator Diagram Fig. 39. Effect of Shaft Governor on Indicator Diagram Fig. 40. Increasing Power of Engine by Condensing Fig. 41. Decreasing Steam Consumption by Condensing CHAPTER IV STEAM ENGINE ECONOMY Under the general heading of steam engine economy, such items as cylinder condensation, steam consumption, efficiency, ratio of expansion, under- and over-loading, condensing, etc., are treated. The principal waste of steam in the operation of an engine is due to condensation during the first part of the stroke. This condensation is due to the fact that during expansion and exhaust the cylinder walls 31 and head and the piston are in contact with comparatively cool steam, and, therefore, give up a considerable amount of heat. When fresh steam is admitted at a high temperature, ..


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Product Details
  • ISBN-13: 9781231166246
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 48
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 123116624X
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 54 gr


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