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A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube that is pinched in the middle, making a carefully balanced, asymmetric hourglass shape. It is used to accelerate a hot, pressurized gas passing through it to a higher speed in the axial (thrust) direction, by converting the heat energy of the flow into kinetic energy. Because of this, the nozzle is widely used in some types of steam turbines and rocket engine nozzles. It also sees use in supersonic jet engines. Similar flow properties have been applied to jet streams within astrophysics. ==History== The nozzle was developed by Swedish inventor Gustaf de Laval in 1888 for use on a steam turbine.〔British patent 7143 of 1889.〕〔 Available on-line (here ) in Google Books.〕〔 Available on-line (here ) in Google Books.〕〔 Available on-line (here ) in Google Books.〕 This principle was first used in a rocket engine by Robert Goddard. Very nearly all modern rocket engines that employ hot gas combustion use de Laval nozzles. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「De Laval nozzle」の詳細全文を読む スポンサード リンク
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