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August 6, 2014, 08:06 |
CFX SCO2 turbine temperature
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#1 |
New Member
Cafard
Join Date: Jun 2014
Posts: 29
Rep Power: 12 |
Hi all,
I try to simulate a SCO2 radial turbine,and the condition are: 1.)Inlet:1MPa(static),reference pressure:12MPa,500K(static) 2.)Outlet:0.01 kg/s (1passage [total:11]) 3.)Material>reference state property> reference temperature:500K reference pressure:12MPa 4.)time scale:2.5e-4 5.)model size=60mm H=30mm 6.)mesh:1.2e5 nodes(quality good) The simulate result was finish at timesteps 5000,residuals was 1e-6 and no vibration. The boundary condition: a.)Outlet pressure : 0.86MPa b.)Outlet temperature : 499K c.)max. velocity(inlet) : 40 m/s My question is why the outlet temperature still near 500k,temperature shuld decrease.I have read the Ansys FAQ,but still not solve the question. By the way,is the reference state property right? |
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August 6, 2014, 08:19 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,826
Rep Power: 144 |
Then you have not modelled the heat transfer correctly. What wall boundary conditions are you using? What temperature are you expecting at the outlet? Why are you expecting it?
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August 6, 2014, 09:30 |
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#3 |
Senior Member
Join Date: Jun 2009
Posts: 1,857
Rep Power: 33 |
May I ask why are you using Static Temperature inlet condition ?
Similarly, why static pressure and not Total Pressure ? I assume you meant 1MPa gauge pressure since you are using a reference pressure of 12MPa, correct ? Not sure what exact material you are using (incompressible, or compressible ?). An incompressible fluid will pass through the turbine and the temperature rise will be minimal (if any). Have you tried running the "Axial Turbine" tutorial provided in the installation ? |
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August 6, 2014, 11:02 |
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#4 |
New Member
Cafard
Join Date: Jun 2014
Posts: 29
Rep Power: 12 |
the wall condition is adibadic
because I want to simulate supercritical CO2,so I use real gas material which is compressible gas. by the reference paper (SCO2 brayton cycle),after the turbine the outlet temperature should decrease,but not just decrease 1K the static state condition just I set,by the way,could I solve my question by set total state condition ? |
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