nozzle
 

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

Re: nozzle
 

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.

Re: nozzle
 

That should read "If the exhaust is supersonic ..."

Re: nozzle
 

My nozzle exit can be either supersonic/sonic. So it's still good for sonic condition?

Shuo

Re: nozzle
 

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.

Re: nozzle
 

Thnaks ag

Re: nozzle
 

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.

Re: nozzle
 

I am simulating a supersonic impinging jet. I was hoping to simplify the grid and coding by excluding the nozzle countour.

Shuo

coding for supersonic 3d nozzle
 

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