The Steam Engine a Practical Guide to the Construction Operation And Care of
The Steam Engine a Practical Guide to the Construction Operation And Care of
Chicago American School of Correspondence At Armour Instit
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The jet must strike the vanes without a sud- den shock, and must leave them in another direction without any sharp deflections. For maximum efficiency the De Laval engine should have a jet velocity equal to one-half the linear velocity of a point on . The wheel-rim ; for the Parsons these velocities should be equal. If the velocity of steam is 8, 000 feet per second, it is easily seen that even one-half of this would cause too great a speed of rotation for safety. It would be difficult to build... a wheel that would be strong enough to withstand the centrifugal force at this high speed. It becomes necessary, therefore, to reduce the speed to the limits of safety, and run under a slightly less efficiency. At such high speed the shaft and wheel should be perfectly balanced, in order that its center of gravity may exactly coincide with the axis of rotation. In practice it has been found impos- sible to balance the shaft perfectly; and in order that it may revolve about its center of gravity, various means are adopted to overcome the rigidity of an ordinary shaft and bearing.
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