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

Re: how to do this turbine blade passage flow nanl

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 12, 2006, 12:37
Default Re: how to do this turbine blade passage flow nanl
  #1
manish
Guest
 
Posts: n/a
hi to all .I want t osiumulate flow through bladepassage of a radial inflow gas turbine.It has presure drop of 2.8,so i have not to use stator.I have 12 no of blades.I am taking only one.It has w=1680 rad/sec (60,000 rpm).Inlet pressure is 2.83 bar (Total pr) outlet is 1.12 bar.Inlet total temp is 923 K and outlet temp is 760 K.mass flow rate is 0.596 kg/sec.Flow velocity at inlet 125 m/sec.I have given different boudary conditions but at each time it is giving very erronous results.i.e .pressure goes upto 9 bar.

(1) when i a m giving mass flow arte at inlet and pressuire at outlet then it is giving erromous resuts.mass flow is conserved but pressure values are far from actualk valus. (2) AT INLET Pressure and oulet pressure .Here pressure valuse have less difrence wit hactual values but mass flow is not mathich. can anybody guide me in this matters.whic hboundary condition i should give.and which initial valus i should give? . second thing is that can i go directly by giving unsteady anal;ysis .or first i have to solve this problem using steady satte and then go throgu hunsteady state. Thnks all.

  Reply With Quote

Old   February 21, 2006, 10:59
Default Re: how to do this turbine blade passage flow nanl
  #2
Mick
Guest
 
Posts: n/a
These problems are not easy.

You should definitly get a steady solution first, otherwise an unsteady solution will not be possible.

This huge error is very likely due to the solution being bad, do the vectors look wild and unrealistic.

If your case is BFC.

Problems may be because of your mesh or possibly because of a possible anomaly with BFC xcycle that I think I have noticed. If so this unfortunately is not an extremely quick thing to turn over a fix for.

An alternative approach (but somewhat expensive computationally)could be to use MOFOR. If you have or can make an STL file of your complete fan geometry. I can find a similar type example which could be used by you as a set-up guide if you are interested in this option.

  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
Flow study through Turbine Blade passage Subrata FLUENT 1 May 4, 2007 11:28
Re: how to do this turbine blade passage flow nanl manish NUMECA 1 November 3, 2006 00:01
how to do this turbine blade passage flow nanlysis kaen CFX 0 January 17, 2006 23:50
how to do this turbine blade passage flow nanlysis manish FLUENT 0 January 13, 2006 22:50
Re: how to do this turbine blade passage flow nanl manish CD-adapco 0 January 12, 2006 12:37


All times are GMT -4. The time now is 19:24.