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Power calculation in centrifugal pump - CFD Post |
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April 27, 2017, 08:58 |
Power calculation in centrifugal pump - CFD Post
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#1 |
New Member
Hazem
Join Date: Mar 2017
Posts: 3
Rep Power: 9 |
I have made a model for centrifugal pump of impeller speed 2960 rpm using CFX. Inlet and impeller domains meshes are done using Turbo-Grid, while Volute mesh is done using Ansys mesher. I defined the impeller as a rotating domain of speed 2960 rpm, while Inlet and Volute as stationary domains. Boundary condition: flow rate at inlet, static pressure at discharge and all other faces are no slip walls.
The model residuals converges, results are excellent and head performance curve is very near to the experimental curve. But the problem is that results of shaft power in simulation is half the value of the experimental data ... consequently, the efficiency calculation was overestimated Power calculated in CFD-post using the following equation Power = Torque * Rotational velocity = Number of Blades * Blade torque * Rotational velocity These are the exact expression written in CFD-Post:
Moreover, I tried to solve the same pump model at different speeds. I found that:
I want to know how to solve this issue to get correct estimation for shaft power and efficiency Last edited by Hazem_9; April 27, 2017 at 12:37. |
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May 11, 2017, 15:22 |
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#2 |
New Member
Evgeniy Ivanov
Join Date: Oct 2016
Location: Russia, Saint-Petersburg
Posts: 3
Rep Power: 10 |
Dear Hazem_9
When you use expression which you wrote (Power = tAllBlades * Absolute Omega / 1 [rad]) you calculate only hydraulic effective power for impeller but not for pump.If you want to calculation power pump you must take into account power losses in your gap between disc of impeller and wall of volute and also loss of friction. Last edited by Evgeniy_IV; May 11, 2017 at 16:34. |
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centrifugal pump., cfx, efficiency, power, shaft power |
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