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stator-rotor interaction in the centrifugal pump

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Old   May 21, 1999, 11:14
Default stator-rotor interaction in the centrifugal pump
  #1
G.H.Lee
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Hi! Friends. I am interested in calculating stator-rotor interaction in the centrifugal pump. Thus, I have searched the published paper in order to obtain the geometry of the centrifugal pump (impeller + vaned diffuser). But I could't find. Is there anyone who inform me the paper containing the full geometry of the centrifugal pump? Thank you.
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Old   May 21, 1999, 12:06
Default Re: stator-rotor interaction in the centrifugal pump
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John C. Chien
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(1). You can only get the full geometry from the pump manufactures in engineering drawing or in CAD file. (2). So, talk to your pump manufacture directly. (3).Paper published contains only the schematic of the blade geometry.(4).If you are doing research on your own, you can design your own pump geometry.(5). The pump catalog will have some basic size information, but not the details,
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Old   May 21, 1999, 12:24
Default Re: stator-rotor interaction in the centrifugal pump
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Tom
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Hy,

if you don't have an impeller geometrie, construct one. I'd try first cylindrical blades and low nq. Hub and shroud are parallel. The outlet and inlet-angles must be calculated with Q, the desired pressure an n . Read perhaps a chapter of book about the design of centrifugal pumps. There are often examples. It is not complicated.

or:

Perhaps you can get a CAD-file from a manufacturer with the 3d-geometrie of a blade

tom
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Old   May 21, 1999, 17:55
Default Re: stator-rotor interaction in the centrifugal pump
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ken elms
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This is the only reference which I can suggest.It would be sensible too,to contact the centrifugal pump manufacturers for drawing details.

CENTRIFUGAL PUMP WITH A VANED DIFFUSER (University of Genova, Italy) 1997/98

Combes (Electricité de France, Chatou) introduced this new test case. The pump consists of an unshrouded impeller of 7 blades with a rotatable diffuser of 12 vanes. Extensive unsteady measurements were made by using hot wires in the gap between the impeller and the diffuser, and by using LDV in the impeller and static pressures on the shroud. By circumferentially averaging results, the periodically perturbed impeller flow can be split into relative steady flow and a stator-generated unsteadiness.

There was one presentation of results by Combes (with Bert and Kueny). They calculated the 2D flow firstly steady and then unsteady with the N3S finite element code. For the latter they used 23,000 triangular elements and 49,800 nodes. They then performed an unsteady 3D computation with 167,000 tetrahedric elements and 270,000 nodes.

The mid-span results of the 3D computation were close to the 2D results.

Some discrepancies existed due to secondary flows caused by the unshrouded impeller whose clearance was not modelled.

In the impeller, there are high fluctuation regions induced by the passing of the leading edge of the vanes.

In the diffuser the wake diffusion process was studied and the mechanisms were seen to be different from those in an axial machine.

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Old   May 25, 1999, 07:33
Default Re: stator-rotor interaction in the centrifugal pump
  #5
Erik Torbergsen
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Hi. The test case from Ubaldi (Univ. of Genova)is published as an ASME paper 94-GT-105, 1994 and contains the necassary information about impeller/diffuser geometry. It really is a good test case for simulation of rotor-stator interactions and can be simulated 2D although some main 3D effects are present in the plots. Especially because of the tip leakage in the unshrouded impeller which changes the pressure distribution compared to a 2D case.
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