Items related to Hydraulics and Its Applications
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. 1908 edition. Excerpt: ...and in the head or tail-race levels. It is of great size and weight in proportion to the power developed, and has a low rotative speed. On the other hand, its construction is simple, its repair inexpensive and easy, and the construction of the supply channel, tail-race, and housing in general inexpensive, while for heads of less than 1 foot it forms the only suitable type of motor. For all heads above 1 foot, where large power is desired, one or other type of turbine becomes suitable, while in certain cases for comparatively small powers, and where a high head is available and a slow rate of rotation is required, the piston engine is most satisfactory. In passing through a prime mover, water may do work either in virtue of its weight; by changing potential energy into useful work in virtue of its motion; by changing kinetic energy into work; by a combination of these processes; or in virtue of its pressure energy, which is simply potential energy in another form. In the overshot water-wheel, for example (Art. 110), rotation is produced almost entirely by the weight of the water; in impulse wheels deriving their motive force from the impact of a high velocity jet of water, work is done solely in virtue of the kinetic energy of the jet; in turbines of the reaction type the pressure energy of the water is partly changed into kinetic energy in the wheel itself, this being absorbed in producing rotation of the wheel; while in a piston engine the water does work in virtue of its pressure, its velocity being so small as to be negligible. In designing any type of hydraulic prime mover, certain general principles should be borne in mind. (a) All shock, whether of water on moving or stationary surfaces, or on water moving with a lower velocity,...
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- PublisherTheClassics.us
- Publication date2013
- ISBN 10 1230451315
- ISBN 13 9781230451312
- BindingPaperback
- Number of pages170
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