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inlet condition (head and discharge) in turbine |
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#1 |
New Member
Sharon Wilcox
Join Date: Aug 2014
Location: California, USA
Posts: 21
Rep Power: 12 ![]() |
hi guys,
In CFX: in my turbine simulation: I want to specify head and discharge( mass flow rate). I can specify pressure outlet and speed is specified initially. If I specify only the massfow rate at the inlet, the head keeps going up when i increase the massflow rate keepinng the speedspeed const or variable. So I want to keep the head or discharge constant , and change the speed to get the power output. How do you do this? Thanks much. |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
Rep Power: 144 ![]() ![]() ![]() ![]() |
You can't. Either the head or the flow rate needs to adjust to the operating point. So you specify one and the other varies.
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#3 |
New Member
Sharon Wilcox
Join Date: Aug 2014
Location: California, USA
Posts: 21
Rep Power: 12 ![]() |
Thanks much:
Keeping the discharge constant, when I increase speed, the head keeps going up and hence the power output: which should reduce after some point of speeds; I just want to simulate the cases at constant head and discharge varying speeds-is there any way to do this? |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
Rep Power: 144 ![]() ![]() ![]() ![]() |
Have you read the best practises guide in the CFX documentation? It discusses this exact topic. You can find them under the Modelling Guide/Advice on Flow Modelling/Best Practice Guides.
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Thread | Thread Starter | Forum | Replies | Last Post |
numerical oscillation when using H-curve to represent discharge through turbine | efdc | Main CFD Forum | 0 | November 18, 2013 10:09 |
FLUENT shows higher head on the turbine | Sanjay Jain | FLUENT | 0 | June 3, 2008 08:41 |