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March 31, 2010, 04:35 |
Radial Load calculation
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#1 |
New Member
NA
Join Date: Jul 2009
Posts: 11
Rep Power: 17 |
Dear All,
I am trying to calculate the radial load on a volute of a centrifugal pump using the function FORCE of CFX_Post. I have obtained too high results for the forces: Fx=5030N Fy=7032N Fz=negligible My pumps makes an head of 177m, SG=1, D2=580m, b2=34mm (disks included), running speed=1740 rpm, NS=382 If I use the empirical formula (Lobanof & Ross) for the calculation of radial load, I obtain a total radial force of about 750N... which is far from the results calculated with CFX. I need to calculate the pressure resultant on volute in radial direction (radial thrust). I think that the proble is the function FORCE of CFX doesn't consider only pressure forces. Could anyone help me??? Thanks a lot. Regards. |
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March 31, 2010, 07:02 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
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The force function includes both pressure and wall shear forces.
The pressure force is worked out relative to the reference pressure. Have you taken that into account? |
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March 31, 2010, 07:26 |
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#3 |
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Join Date: Jul 2009
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No problem for the refence pressure, I have an axial symmetric surface. I made also some test changing the reference pressure and results doesn't change. What should I set to take in account only pressure forces and not shear stress forces.
Many thanks for your quick reply. Regards |
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March 31, 2010, 17:51 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
Then do a surface integral of pressure.
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