Steam Turbine Design; With Especial Reference to the Reaction Type, Including Chapters on Condensers and Propeller Design

Steam Turbine Design; With Especial Reference to the Reaction Type, Including Chapters on Condensers and Propeller Design

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...to develop in the arms and also, opposite the arms, in the flange to which the dummy is connected. Q The disc type of forged wheel, illustrated in Fig. 64 (a) and (b), has the advantage of cheapness. When comparing it with the open type, Fig. 64 (c), due regard must be paid to questions of stiffness and weight. Stiffness is required to transmit the propeller thrust as well as the twisting moment. 17. Dimensions of Rotor Wheels.--In the wheels with solid arms (open type) the breadth of arm may be equal to the diameter of the shaft where it enters the wheel. The thickness of the arm at the root should be proportioned for a suitable working stress. The thickness of the outer end of the arm is usually three-quarters of that at the root in cast wheels, and equal to it in forged wheels. The thickness of the hub may be T for wheels at the after end which have to transmit torque, and = to-for forward wheels; d being the diameter of the shaft or of the hole through the hub. The thickness of the rim may be made equal to the average thickness ta of the drum. If these proportionate dimensions be adopted it remains only to calculate the strength of the arms. The number of arms of a cast wheel should preferably be odd, e.g. 7, 9 or 11 (see Fig. 66). 18. Strength of Wheel Arms.--Let T = twisting moment in lbs.-inches f = stress in the material of shaft, lbs. per sq. inch / = stress in material of arms, lbs. per sq. inch d = diameter of shaft in inches (if solid) di, dt = external and internal diameters of shaft (if hollow) R = radius of wheel in inches I = distance of root of arms from outer circumference, inches / = thickness of arm at root in inches b = breadth of arm in inches n = number of arms. The twisting moment in the shaft is T = i/8 for...show more

Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236945220
  • 9781236945228