CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

radial turbine flow analysis

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   July 2, 2007, 09:18
Default radial turbine flow analysis
  #1
ME
Guest
 
Posts: n/a
Hi, everybody, I am simulating radial inflow gas turbine. For that i m finding these queries. pls let me know if anybody knows (1) Which type of BCS should be used? Inlet total pressure is 2.73 bar and total temp is 923 K. which type of inlet turbulence shu be specified? (2) which type of turbulence model should be used? Should I use spalart allmaras, ke (low RE) or Reynolds stress model? I was thinking to apply ke initially and once it is getting converged, then switch over to RSM. Pls also let me know, that is there any low Re model in CFX?(3) how much should I extend my domain at inlet and outlet? Is that any thumb rule? (4) Presently i am thinking to run analysis at 10 percent of speed and then slowly increasing it once it is converged? (blade speed is 60,000 rpm). Is it ok? is tht ant thumb rule? (5) If I want to take secondary flow into account, then what shud me my mesh requirement? (6) Shud I do transient or steady? Thanks a lot.

  Reply With Quote

Old   July 6, 2007, 09:34
Default Re: radial turbine flow analysis
  #2
Ahmed emad
Guest
 
Posts: n/a
i want to know exactely the component of radial turbine and hwo to cooling it thanks

  Reply With Quote

Old   July 9, 2007, 00:05
Default Re: radial turbine flow analysis
  #3
ME
Guest
 
Posts: n/a
Hi, Ahmed, thnank u very much for ur response.

It is only rotor and in that case also only one blade passage. There isnt any cooling flow analysis. As I am using very high temp resistant material. It may done, but I am not doing at present. can u tell me which boundary conditions should be applied?
  Reply With Quote

Old   July 9, 2007, 10:53
Default axial turbine power
  #4
Ahmed emad
Guest
 
Posts: n/a
sorry please iwant to knwo the percentage of divided the power out from axial turbine 1)Thrust force 2)drive compressor/fan 3)operat accesories
  Reply With Quote

Old   July 9, 2007, 21:29
Default Re: axial turbine power
  #5
ME
Guest
 
Posts: n/a
Hi, Ahmed I havent data, as I am developing a test ring for gas turbine, working on radial comp and radial turbine. My interest is only on turbine. So, I havent any data which u want. I have only inlet pressure, temp, efficiency, mach no, aerodynamic and thermal data etc. Pls let me know ur response.
  Reply With Quote

Old   July 11, 2007, 00:23
Default Re: axial turbine power
  #6
Pankaj
Guest
 
Posts: n/a
Hi Mr. ME,

You can get many clues from internet,just search for Turbine(or Turbomachinary) CFD analysis.

To start with u can use Static pressure outlet and mass or velocity inlet.Use K-w.Go through the radial compressor tutorial for more clues.

After that u can switch over to Mass flow outlet and Total pressure and total temp inlet and use SST to be more accurate.
  Reply With Quote

Old   July 11, 2007, 22:47
Default Re: axial turbine power
  #7
ME
Guest
 
Posts: n/a
Hi Pankaj and Ahmed, Thanks for kind response. Would you please tell me abt bondary mesh for blade passage. Currenly I have found boundary layer thickness based on flat plate formula (assuming blade as flat plate) and have put 30 to 40 cells in that. Is this enough. Should I also try for coulple of runs to check y plus for k-e wall function? Should I take staedy or transient. I am thinking that I shu initially take k-e staedy and with 6000 rpm ( actual speed is 60,000 rpm) . Once I am getting convergence then I will gradually increase rpm. Then I will take RSM or SST staedy an d then I will take transient RSm or SST. Pls let me know that IS this approach right?

Thanks again.
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Usage of Star-CD in analysis of Wind Turbine Manabendra M. De CD-adapco 5 January 7, 2007 00:42
Re: how to do this turbine blade passage flow nanl manish CD-adapco 0 January 12, 2006 12:37
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 21:31
Flow visualization vs. Calculated flow patterns Francisco Saldarriaga Main CFD Forum 1 August 2, 1999 23:18
flow in gas turbine Abdul Hafid Main CFD Forum 1 September 14, 1998 09:39


All times are GMT -4. The time now is 06:15.