Tesla Turbine

Saima · September 28, 2016, 15:12

Hello,

I have a CFD problem of co-rotating discs (a simplified tesla turbine). Fluid is CO2, with 3MPa pressure and 10,000 rpm.

What are the boundary conditions need to be taken?
As per my understanding its a compressible flow, wanna make sure is it correct?

Total pressure and temperature will be inlet boundary conditions and outlet static pressure.

Kindly give me suggestions.

DarylMusashi · September 29, 2016, 15:52

Hello Saima,

this sounds quiete interesting. As the inlet total pressure is most probably significantly higher than the outlet pressure the fluid should assumed to be compressible.

Which turbulence model are you going to use for this? I am sure you are aware of the fact, that you need a high quality boundary layer mesh for this, as boundary layer effects are the basis principle of a tesla turbine.

Secondly, how exactly do you model the discs? Do they have a certain roughness? As far as I know the discs in a tesla turbine are very close to each other. A certain roughness or a no-slip condition will probably have very different effects on the flow field.

Saima · October 18, 2016, 20:18

If need to define dimensionless mass flow rate at inlet, what is the possibility to do that?

Quote:

Originally Posted by DarylMusashi

Hello Saima,

this sounds quiete interesting. As the inlet total pressure is most probably significantly higher than the outlet pressure the fluid should assumed to be compressible.

Which turbulence model are you going to use for this? I am sure you are aware of the fact, that you need a high quality boundary layer mesh for this, as boundary layer effects are the basis principle of a tesla turbine.

Secondly, how exactly do you model the discs? Do they have a certain roughness? As far as I know the discs in a tesla turbine are very close to each other. A certain roughness or a no-slip condition will probably have very different effects on the flow field.

September 28, 2016, 15:12	Tesla Turbine	#1
Saima Senior Member Saima Join Date: Apr 2009 Location: Canada Posts: 185 Rep Power: 16	Hello, I have a CFD problem of co-rotating discs (a simplified tesla turbine). Fluid is CO2, with 3MPa pressure and 10,000 rpm. What are the boundary conditions need to be taken? As per my understanding its a compressible flow, wanna make sure is it correct? Total pressure and temperature will be inlet boundary conditions and outlet static pressure. Kindly give me suggestions. __________________ Best Redards, Saima

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September 29, 2016, 15:52		#2
DarylMusashi Senior Member Holger Dietrich Join Date: Apr 2011 Location: Germany Posts: 174 Rep Power: 15	Hello Saima, this sounds quiete interesting. As the inlet total pressure is most probably significantly higher than the outlet pressure the fluid should assumed to be compressible. Which turbulence model are you going to use for this? I am sure you are aware of the fact, that you need a high quality boundary layer mesh for this, as boundary layer effects are the basis principle of a tesla turbine. Secondly, how exactly do you model the discs? Do they have a certain roughness? As far as I know the discs in a tesla turbine are very close to each other. A certain roughness or a no-slip condition will probably have very different effects on the flow field.