[Graham81]

Why? do you need one? The designing has already been done; just go buy one. I can't even imagine how one would design one; probably alot of trial and error. Like an airplane propeller. But I do know that as the tips of an airplane propeller reach the speed of sound, efficiency falls off drastically. There is probably something like that limiting the RPM of an impeller.

Dont tell anyone the designing has already been done and you can just by one, that would cost me my job.

[PSYMN]

That is sort of funny. You would think that after all the optimization that has been done on these pumps the design space would be fully explored. But we have thousands of simulation engineers still working furiously at making a better pump... Every now someone pushes the performance up a little bit or tailors the performance more closely to the needs.

The funny thing about this sort of turbo machinery optimization is that when the analyst gets even a tiny improvement (just a percent or two), they are usually very excited.

This is also why they need a good hexa mesh. A tetra prism mesh just has too much noise from the changing meshes and you can not be sure that the 1 or 2 percent isn't just due to the different mesh topology.

[Graham81]

The range of applications is just very large. And most customers these days want pumps that run at 90% efficiency from 10 to 100000 m3/hr, free from cavitation.

[lbossi]

yes, multi-point and multi-objective design optimisation is a hot topic for pumps and turbomachinery in general.

I often refer to this paper for such pump design requirements, it illustrates well how very often design requirements are in the form of trade-off between the different objectives: http://dx.doi.org/10.1115/FEDSM2009-78348

[lbossi]

yes, multi-point and multi-objective design optimisation is a hot topic for pumps and turbomachinery in general.

I often refer to this paper for such pump design requirements, it illustrates well how very often design requirements are in the form of trade-off between the different objectives: http://dx.doi.org/10.1115/FEDSM2009-78348

[ejdaiou]

Originally Posted by Jade M

I see. I am very experienced in CFD and have gotten reasonably up to speed with CFX. I am getting ready to treat a centrifugal pump problem in CFX. I was hoping that we could help each other but unfortunately I am not familiar with FLUENT or OpenFoam. Good luck with your analysis.

Dear sir , how are you i hope that all it's OK,
following of your above information , i would like your help to design an impeller with CFX 13 , actually i am working on the probleme of study of the fall of performence of a centrifugal pump in a system of two-phase flow (diphasique )
, while the pump of studies is a real pump in petrolium field , i have all the neccessary compenents to acheve the reverse engineering of this pump and processing it in CFX , but also i have probleme to draw the scheme of impeller and get the real angle mesurement .
please if you have any idea about this work , send us your proposition .
thanks in advance

.

[Far]

For this purpose you need some reverse engineering machines e.g. 3d scanner

[billy7590]

I am working on CFD simulation of flow through the impeller of centrifugal pump. I am not considering the volute. My problem is that I don't have a clear idea about how much pressure rise should occur in the impeller. I mean, it is just giving kinetic energy to the fluid so that means, static pressure should not rise too much. But in my case, the results are:

Inlet BC: 1.99 bar pressure
Outlet BC: 332 kg/s flow rate
Wall BC: Shroud, hub and blades

From simulation, I get
Outlet Pressure: About 9 bar

My question is that isn't it too high for an impeller of 48 cm diameter running at 1480 rpm .. ?