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femoral

de Laval nozzle for 60mm Server Fan

by femoral Sep 2, 2013
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Here's a "Combustion Chamber" to add to the nozzle for a scale model biprop rocket engine: http://www.thingiverse.com/thing:868238

Combustion Chamber for deLaval nozzle (https://www.thingiverse.com/thing:144657)

very nice! This is a great idea. Thanks for sharing :)

This is great. I made one to show during our "spacecraft propulsion" session in my annual Basics of Interplanetary Flight course with Art Center College of Design. I used to use an actual rocket engine, about the same size as this one, but years ago it became unavailable. Nice to have a physical object to handle, over and above viewgraphs and images and arm waving! (But I don't think it would stand up to supersonic choked-flow hot gas : - )

so just a cooling fan? It is impossible to achieve supersonic flow with that type of fan. The pressure is not high enough for the exit velocity. I am trying to get a shop vac to go supersonic and even that is doubtful! what were you testing? I love aerodynamics and fluid mechanics!

hi there, we made this just for testing in low air speeds. Problem with this design is that the smallest point of the nozzle is way too small. Only thing that happens is that it stops most of the air moving out of the nozzle.
I guess it could work if the air speed would be super sonic. I guess it would be useful to print this nozzle in metal and use a rocket engine.

I noticed for my van de laval that if the speeds are non-supersonic the exhaust is quite turbulent and the velocity is very time dependent. If you were not testing for mach >1 what were you testing? I do not know of any other use for the particular design. Were you trying to achieve supersonic speeds by contracting the nozzle like crazy (that is what I tried with the shop vac. at a certain point even that has a hole lower limit and by decreasing the diameter of the hole it decreased the velocity)?