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- Bell_nozzle abstract "The Bell-shaped or Contour nozzle is probably the most commonly used shaped rocket engine nozzle. It has a high angle expansion section (20 to 50 degrees) right behind the nozzle throat; this is followed by a gradual reversal of nozzle contour slope so that the nozzle exit the divergence angle is small, usually less than a 10 degree half angle.Ideally a nozzle is wished to direct all of the gases generated in the combustion chamber and accelerated by the throat to leave the nozzle traveling straight out the nozzle. That means the momentum of the gases are axial, imparting the maximum thrust to the rocket. In fact, there are some non-axial components to the momentum. In terms of a momentum vector, there is an angle between the axis of the rocket engine and the flow of the gas. As a result, the thrust is lowered by varying amounts. The Bell or Contour shape is designed to impart a large angle expansion for the gases right after the throat. The nozzle is then curved back in to give a nearly straight flow of gas out the nozzle opening. The contour used is rather complex. The large expansion section near the throat causes expansion shock waves. The reversal of the slope to bring the exit to near zero degrees causes compression shock waves. A properly designed nozzle will have these two sets of shock waves coincide and cancel each other out. In this way, the bell is a compromise between the two extremes of the conical nozzle since it minimizes weight while maximizing performance.The most important design issue is to contour the nozzle to avoid oblique shocks and maximize performance.In his classic textbook, George P. Sutton credits Dr. G.V.R. Rao with working out the mathematics of the optimal bell nozzle design in 1955, while working at Rocketdyne.".
- Bell_nozzle wikiPageID "9465966".
- Bell_nozzle wikiPageLength "2842".
- Bell_nozzle wikiPageOutDegree "6".
- Bell_nozzle wikiPageRevisionID "660885682".
- Bell_nozzle wikiPageWikiLink Aerospike_engine.
- Bell_nozzle wikiPageWikiLink Category:Nozzles.
- Bell_nozzle wikiPageWikiLink Expanding_nozzle.
- Bell_nozzle wikiPageWikiLink George_P._Sutton.
- Bell_nozzle wikiPageWikiLink Plug_nozzle.
- Bell_nozzle wikiPageWikiLink Rocketdyne.
- Bell_nozzle wikiPageWikiLinkText "Bell nozzle".
- Bell_nozzle wikiPageWikiLinkText "bell nozzle".
- Bell_nozzle wikiPageWikiLinkText "engine bell".
- Bell_nozzle wikiPageWikiLinkText "engine bells".
- Bell_nozzle wikiPageUsesTemplate Template:Refimprove.
- Bell_nozzle subject Category:Nozzles.
- Bell_nozzle type Dynamic.
- Bell_nozzle comment "The Bell-shaped or Contour nozzle is probably the most commonly used shaped rocket engine nozzle.".
- Bell_nozzle label "Bell nozzle".
- Bell_nozzle sameAs Q4883316.
- Bell_nozzle sameAs m.028b050.
- Bell_nozzle sameAs Q4883316.
- Bell_nozzle wasDerivedFrom Bell_nozzle?oldid=660885682.
- Bell_nozzle isPrimaryTopicOf Bell_nozzle.