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

Torque Converter Pump Torque = Engine Torque?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 8, 2012, 15:26
Default Torque Converter Pump Torque = Engine Torque?
  #1
Member
 
Join Date: Jan 2012
Location: Indiana, USA
Posts: 84
Rep Power: 5
Torque_Converter is on a distinguished road
Send a message via AIM to Torque_Converter
This seems like the silliest thing to be caught up in, but I keep seeing correct Turbine output torques, but the Pump torque from analysis puts out higher values than Engine input torque. It would seem this is impossible by conservation of energy, but the torque production in the Turbine is always so right at every SR, even in other Torque Converters.

Is it possible the pump reaction torque from spinning at a given RPM is different from the engine input torque?
Torque_Converter is offline   Reply With Quote

Old   November 9, 2012, 02:16
Default
  #2
Member
 
Join Date: Mar 2009
Posts: 85
Rep Power: 8
husker is on a distinguished road
Can you please give more details?
husker is offline   Reply With Quote

Old   November 9, 2012, 09:12
Default
  #3
Member
 
Join Date: Jan 2012
Location: Indiana, USA
Posts: 84
Rep Power: 5
Torque_Converter is on a distinguished road
Send a message via AIM to Torque_Converter
The pump is connected directly to the engine. But when I simulate it moving at the same speed in CFX it produces a different torque than the engine. Should it produce the same torque due to conservation of energy, or a different torque because CFX is calculating "reaction" torque which is different?
Torque_Converter is offline   Reply With Quote

Old   November 12, 2012, 03:30
Default
  #4
Member
 
Join Date: Mar 2009
Posts: 85
Rep Power: 8
husker is on a distinguished road
Please let me explain what I understand.

You are simulating the flow inside a pump and the resultant torque value is higher than the test value. Is this true?

If so, there may be many reasons involving the over-estimation of the torque. Such as working conditions of the pump, the physical assumptions and the flow differences between the test and the simulation.

Can you please share a diagram or a screenshot of your problem? Also the details of the physical setup, boundary conditions and the mesh.

Regards

Last edited by husker; November 12, 2012 at 08:32.
husker is offline   Reply With Quote

Old   November 12, 2012, 07:44
Default
  #5
Member
 
Join Date: Jan 2012
Location: Indiana, USA
Posts: 84
Rep Power: 5
Torque_Converter is on a distinguished road
Send a message via AIM to Torque_Converter
I'm sorry, I'm still not explaining it right.

The engine is turning a pump at a certain RPM with a certain engine torque.

However, there is a torque calculated inside the pump in CFX based on the reaction of the fluid. The absolute value of this torque is higher, and the direction is the opposite of the engine.

I believe the two should be different due to blade differences, wall shear, and the fluid not always moving circumferentially the same speed as the solid of the walls blades. I.e. speed ratio effect.
Torque_Converter 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
CFD-Post axial pump torque m4D CFX 0 October 15, 2012 07:48
engine flow analysis to find torque maurizio CFX 8 August 13, 2007 02:07
cfd analysis of torque converter kiran CFX 0 September 27, 2005 06:00
Boundary conditions for Torque Converter Alaa FLUENT 0 November 15, 2004 18:38
Torque calculation in centrifugal pump novice CD-adapco 0 August 11, 2004 05:47


All times are GMT -4. The time now is 13:34.