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Stepped nozzle
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Stepped nozzle : ウィキペディア英語版
Stepped nozzle
A stepped nozzle is a de Laval rocket nozzle which has altitude compensating properties.
The characteristic of this kind of nozzle is that part of the way along the inside of the nozzle there is a straightening of the curve of the nozzle contour, followed by a sharp step outwards.
At low altitude this causes the jet to separate at the step, and ambient pressure maintains the jet at this place, avoiding jet instabilities and avoiding massive overexpansion.
As the altitude rises the jet becomes progressively under-expanded and grows until it fills the nozzle, at which point the gas provides more pressure against the rest of the nozzle and thrust and specific impulse increases.
== See also ==

* Nozzle extension


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「Stepped nozzle」の詳細全文を読む



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