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

determine rpm value of turbine

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 23, 2013, 06:22
Default determine rpm value of turbine
  #1
New Member
 
ruya
Join Date: Apr 2013
Location: TURKEY
Posts: 4
Rep Power: 4
ruya is on a distinguished road
hi friends.
I have a problem that how can determine value of turbine flow meter. Firstly I gave an arbitrary value to rotor such as 11 rad/s then I calulated torque with cfd- post but I don't know that I move on or how can ı compare torque and rpm that I gave.
I want to help. Thanks.
ruya is offline   Reply With Quote

Old   April 24, 2013, 15:26
Default
  #2
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,915
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
You can draw the graph of Cp VS torque or rpm and compare it to the experimental trends.
Far is offline   Reply With Quote

Old   April 30, 2013, 12:39
Default
  #3
New Member
 
ruya
Join Date: Apr 2013
Location: TURKEY
Posts: 4
Rep Power: 4
ruya is on a distinguished road
thanks but I haven't got experimental results. I change my procedure. I prefer that I obtain volumetric flow according to given rpm. but I have a problem because volumetric flow rate doesn't change according to value of rpm. This stiuation is impossible and rpm doesn't effect flow rate.
ruya is offline   Reply With Quote

Old   April 30, 2013, 19:19
Default
  #4
Senior Member
 
Stuart Buckingham
Join Date: May 2010
Location: United Kingdom
Posts: 267
Rep Power: 16
stuart23 will become famous soon enough
You have three variables in your simulation that you are trying to either control or evaluate: mass flow rate (or pressure ratio), turbine speed and load.

On a dyno, you would specify the MFR and load to get the resulting speed, however to do this in a CFD simulation requires a UDF to modify the rotational speed depending on the torque at the turbine axis. This is rather complicated and not recommended.

An easier approach is to set the rotational speed and MFR then measure the resulting torque. Once you graph these results, you will get the same figure as if you had dyno tested the turbine.


Stu
__________________
http://bc247.wordpress.com
stuart23 is offline   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
determine rpm value of turbine ruya Main CFD Forum 2 April 26, 2013 04:48
turbine RPM in star-ccm+ saleh alsubari STAR-CCM+ 1 August 28, 2012 19:10
Wind Turbine RPM in CFD Shamoon Jamshed Main CFD Forum 4 February 13, 2012 13:42
OpenFoam 1.6-ext - RPM build errors preibie OpenFOAM 12 September 8, 2011 03:12
RPM vs time for a turbine johnny FLUENT 0 November 10, 2005 05:00


All times are GMT -4. The time now is 02:33.