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Research Papers

Bowl-Type Diffusers for Low Specific-Speed Pumps: An Industrial Application

[+] Author and Article Information
Paolo Boncinelli

“Sergio Stecco” Department of Energy Engineering, University of Florence, Via di Santa Marta, 3, Florence 50139, ItalyPaolo.Boncinelli@icad.de.unifi.it

Roberto Biagi, Antonio Focacci, Umberto Corradini, Andrea Arnone

“Sergio Stecco” Department of Energy Engineering, University of Florence, Via di Santa Marta, 3, Florence 50139, Italy

Marco Bernacca

 TM.P. S.p.A.-Termomeccanica Pompe, Via del Molo 3, La Spezia 19126, Italym.bernacca@termomeccanica.com

Massimiliano Borghetti

 TM.P. S.p.A.-Termomeccanica Pompe, Via del Molo 3, La Spezia 19126, Italy

J. Turbomach 130(3), 031013 (May 05, 2008) (9 pages) doi:10.1115/1.2777182 History: Received January 15, 2007; Revised February 22, 2007; Published May 05, 2008

In this paper, the aerodynamic design of a bowl-type diffuser for a low specific-speed pump is presented and described in detail. The main goal was to achieve an optimal configuration in terms of diffuser recovery capacity and stage aerodynamic efficiency, while satisfying severe constraints concerning stage size and multistage feasibility. Both geometrical parametrization tools and a fully viscous three-dimensional numerical solver were exploited in the design process. The geometrical parametrization allowed one to control and modify the geometry of the component by changing a limited number of parameters. Computational fluid dynamics analysis was exploited to assess the effectiveness of the geometrical modifications on the performance and to identify critical problems. A number of aerodynamic 1D coefficients with simple physical meanings were also introduced and used as a support to the design to synthesize the main feature of the strongly three-dimensional flow evolving in the component. As a result, a new stage configuration was developed according to the imposed constraints, whose performance is at the same level as standard pumps of the same class.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 14

Comparison of βbl angle distributions

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Figure 15

Comparison of diffuser meridional channel geometries

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Figure 16

Comparison of blade load distributions at DP

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Figure 17

Stream lines and velocity flow field at DP (“des3”)

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Figure 18

Comparison of flow properties along the diffusion channel at DP

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Figure 19

Comparison of diffuser performance

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Figure 20

Comparison of stage efficiency

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Figure 21

Comparison of diffuser outlet flow angle distributions at DP

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Figure 22

Map of pressure recovery coefficient for a given blockage range (0.05<B⩽0.08)(24)

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Figure 13

Flow properties along the diffusion channel at DP (“des1”)

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Figure 12

Sections along the diffusion channel

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Figure 11

Stream lines and velocity flow field at DP (“des1”)

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Figure 10

Swirl angle distribution at diffuser outlet (“des1”)

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Figure 9

Blade load distribution at DP (“des1”)

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Figure 8

βbl angle distribution (“des1”)

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Figure 7

Impeller outlet absolute flow angle at DP

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Figure 6

Impeller blade load distributions at DP

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Figure 5

βbl angle parametrization and corresponding θ angles

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Figure 4

Meridional contour parametrization

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Figure 3

Example of a Bézier curve of degree n=5

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Figure 2

3D view of the computational grid

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Figure 1

Meridional view of computational domain and performance evaluation sections

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