water wheel
water wheel
also wa·ter·wheel (wô′tər-wēl, -hwēl, wŏt′ər-)water wheel
Noun | 1. | ![]() |
2. | ![]() |
单词 | water wheel | ||||||
释义 | water wheelwater wheelalso wa·ter·wheel (wô′tər-wēl, -hwēl, wŏt′ər-)water wheel
water wheelwater wheel,device for utilizing the power of flowing or falling water. The Norse wheel is the oldest type known. Despite its name it probably originated in the Middle East, where the swift stream required by this type of wheel is common. The Norse wheel has a vertical shaft directly connected at the top to a millstone; the lower end of the shaft, with vanes or paddles attached, dips into the flowing stream. In the 1st cent. B.C. a horizontal shaft came into use; the wheel attached to it had radial vanes around its edge. Among the early forms of this wheel are the overshot wheel, used where water falls from a height, striking the vanes from above; the breast wheel, employed where the height of the water is less than the height of the wheel so that the water strikes the wheel about midway; and the undershot wheel, usable where the water flows more or less on a level but with a swift current and strikes the vanes on the under part of the wheel. One of the first uses of the steam engine was to drive a pump that raised water into a millpond whose spillway drove a water wheel. Today the water wheel has been largely replaced by the turbineturbine,rotary engine that uses a continuous stream of fluid (gas or liquid) to turn a shaft that can drive machinery. A water, or hydraulic, turbine is used to drive electric generators in hydroelectric power stations. ..... Click the link for more information. . See hydraulic machinehydraulic machine, machine that derives its power from the motion or pressure of water or some other liquid. Hydraulic Engines Water falling from one level to a lower one is used to drive machines like the water wheel and the turbine. ..... Click the link for more information. . water wheelwater wheel
Synonyms for water wheel
|
||||||
随便看 |
|
英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。