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

force acting on gas turbine blade....

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 19, 2007, 00:43
Default force acting on gas turbine blade....
  #1
vvj
Guest
 
Posts: n/a
Hi friends...

1. To get the force acting on the turbine blade due to impact of gasses, which pressure i have to take into account?? either static pressure or total pressure??? and why??

2. For 3-d blade multi-stage turbine analysis (again in order to get the force acting on the blade), how many blades i have to consider for geometry modelling?? and why??

3. If i want to capture the shock in case of the turbine blade how far i have to consider the flow field from the blade???

PLZ reply... Thank you... Suggest me a good e-book, for CFD analysis of gas turbines..
  Reply With Quote

Old   March 3, 2010, 01:04
Default
  #2
Senior Member
 
Hamid Zoka
Join Date: Nov 2009
Posts: 293
Rep Power: 18
Hamidzoka is on a distinguished road
hi,
1-static pressure should be considered in calculations. total pressure is in fact the total energy content of the fluid stream and it has nothing to do with the force exerted on blade surfaces

2-it depends on type of the analysis. in steady state solutions it is enough to model just one blade per each row. but when unsteady calculations is required, the number of blades should be selected such that all rows possess the same pitch. for example if you have 40 stator and 80 rotor, you should model 1 stator and 2 rotor. in cases the blade count ratio is not integer, firstly you should change the number of blades to reach an integer ratio.(refer to unsteady analysis papers)

3-in case you model a subsonic turbine flow and in case shock waves occure in first stage stator, you will clearly see the shock in results it your meshing is fine enough. refer to static pressure and Mach number contours to see their sudden variations through the shcok wave. it is usually recommended to put your inlet/outlet boundries away from leading or trailing edges as much as the thickness of your blade.

best regards
zoka
Hamidzoka is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Force can not converge colopolo CFX 13 October 4, 2011 22:03
Calculating lift force of a wind turbine blade problem LittleBart CFX 4 June 29, 2011 02:33
Setting up gas turbine blade geometry for meshing sherifkadry Main CFD Forum 0 June 1, 2009 16:28
internal cooling of gas turbine blade vinay FLUENT 0 October 20, 2008 15:20
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 22:02


All times are GMT -4. The time now is 09:00.