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.
^Génin, Chloé; Schneider, Dirk; Stark, Ralf (2021), Adams, Nikolaus A.; Schröder, Wolfgang; Radespiel, Rolf; Haidn, Oskar J. (eds.), "Dual-Bell Nozzle Design", Future Space-Transport-System Components under High Thermal and Mechanical Loads: Results from the DFG Collaborative Research Center TRR40, Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Cham: Springer International Publishing, pp. 395–406, doi:10.1007/978-3-030-53847-7_25, ISBN978-3-030-53847-7
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stepped, nozzle, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, december, . This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Stepped nozzle news newspapers books scholar JSTOR December 2021 Learn how and when to remove this template message A stepped nozzle or dual bell nozzle 1 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 editNozzle extension Bell nozzleReferences edit Genin Chloe Schneider Dirk Stark Ralf 2021 Adams Nikolaus A Schroder Wolfgang Radespiel Rolf Haidn Oskar J eds Dual Bell Nozzle Design Future Space Transport System Components under High Thermal and Mechanical Loads Results from the DFG Collaborative Research Center TRR40 Notes on Numerical Fluid Mechanics and Multidisciplinary Design Cham Springer International Publishing pp 395 406 doi 10 1007 978 3 030 53847 7 25 ISBN 978 3 030 53847 7 nbsp This article about a mechanical engineering topic is a stub You can help Wikipedia by expanding it vte nbsp This article about aircraft engines is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Stepped nozzle amp oldid 1149436679, wikipedia, wiki, book, books, library,
