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July 6, 2019, 22:56 |
Pressure drop across a converging nozzle
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#1 |
New Member
Michael
Join Date: May 2014
Posts: 28
Rep Power: 12 |
Hi guys,
I'm currently doing an analysis at work for the pressure drop across a converging nozzle. Nozzle is used for supply air ventilation into a train tunnel. Due to probity and confidentiality I am unable to post any pictures, but here is a brief description of the geometry and flow conditions The nozzle has the inlet, with air flowing horizontally (i.e left to right) and then has a 30degree transition downwards and makes it way to the outlet. The overall length of the nozzle is about 4m. Nozzle Inlet Area: 8m2 Nozzle Outlet Area: 2m2 Nozzle Inlet Volume Flow: 65m3/s Trying to understand: The pressure drop across the nozzle. The boundary conditions i applied in CFX: Inlet: Volume Flow Rate Outlet: Averaged Static Pressure Walls: No slip wall Result: I was getting a whopping 700Pa loss across the nozzle. Comparing this to previous project example, they were getting maximum 60Pa loss across their nozzles of a similar shaped geometry and similar flow rates. Either they were fudging their numbers (i only have a report to read off for their results) or I am doing something wrong. Question: Am I applying the correct boundary conditions for this sort of case in CFX? Is a 700Pa loss across this nozzle really possible? Thanks guys! (First post here ) |
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Tags |
cfx, nozzle |
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