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Old   February 11, 2008, 21:06
Default nozzle
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Shuo
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I am modelling a supersonic jet issued from a convergent nozzle. So far the computational domain is a box. Is there any advantages of including the nozzle profile as well?

Shuo
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Old   February 12, 2008, 10:20
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ag
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If the et is supersonic, then no signals can propagate back upstream. So if you have the correct nozzle exhaust, then I would think you should be good to go. Note that this only applies for a supersonic exit at the nozzle.
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Old   February 12, 2008, 10:21
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ag
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That should read "If the exhaust is supersonic ..."
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Old   February 12, 2008, 23:34
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Shuo
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My nozzle exit can be either supersonic/sonic. So it's still good for sonic condition?

Shuo
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Old   February 13, 2008, 09:54
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ag
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As long as the nozzle exit Mach number is greater than one then signals can't travel back upstream. If you have a converging-diverging nozzle then you'll have a hard time getting M=1 at the nozzle exit (nozzles don't work like that). So in that case you would need to model the nozzle itself. The only way to have a sonic condition at the exit is if you have a converging only nozzle. In that case, the sonic flow at the throat would be sufficient to ensure no signal propagation back upstream, as long as the throat remains choked.
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Old   February 13, 2008, 17:55
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shuo
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Thnaks ag
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Old   February 19, 2008, 14:57
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Joe
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What type of analysis are you doing? What type of information are you looking for. In general modeling the nozzle is a good idea. A velocity profile at a nozzle exit is not the idealized profile you are probably specifying.
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Old   February 19, 2008, 19:34
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Shuo
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I am simulating a supersonic impinging jet. I was hoping to simplify the grid and coding by excluding the nozzle countour.

Shuo
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Old   March 7, 2011, 01:36
Default coding for supersonic 3d nozzle
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DINESH KUMAR.T
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Hi,

Does anybody have a Matlab code for MOC contour design of an axisymmetric supersonic (Mach 2) nozzle they could send me @

dinesh_astronaut@yahoo.co.in

Thanks in advance,
DINESH
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