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August 24, 2016, 10:12 |
Jet Flow
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#1 |
New Member
Peter
Join Date: Jun 2016
Posts: 10
Rep Power: 10 |
Hi,
I am doing a simulation of jet flow from a converging nozzle. One result that I am getting is that the centerline velocity of the jet increases for a couple of mm after exiting the nozzle as opposed to maintaining the exit velocity as I would have expected. Would anyone be able to explain this? Thanks |
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August 24, 2016, 10:24 |
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#2 |
Senior Member
Charles
Join Date: Aug 2016
Location: Vancouver, Canada
Posts: 150
Rep Power: 10 |
after exiting, the flow will expand. So it basically like a converging-diverging flow. if it is subsonic during converging and sonic at exit, then it will go supersonic after exiting. However, this can not last long. a normal (barrel) shock wave will form and the velocity drops. It is difficult to model shock wave. so simulation can only give you a rough picture.
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