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Research Papers: Flows in Complex Systems

Rotational Flow in Centrifugal Pump Meridian Using Curvilinear Coordinates

[+] Author and Article Information
František Pochylý

Victor Kaplan Department of Fluids Engineering,
Faculty of Mechanical Engineering,
Brno University of Technology,
Technická 2896/2,
Brno 616 69, Czech Republic
e-mail: pochyly@fme.vutbr.cz

Jiří Stejskal

SPP Pumps Ltd,
Crucible Close,
Coleford,
Gloucestershire GL16 8PS, UK
e-mail: Jiri_Stejskal@spppumps.com

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 25, 2015; final manuscript received January 26, 2016; published online April 22, 2016. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 138(8), 081101 (Apr 22, 2016) (6 pages) Paper No: FE-15-1765; doi: 10.1115/1.4032756 History: Received October 25, 2015; Revised January 26, 2016

A new model for calculation of the velocity field in a pump meridian is presented in this paper. It is a parameterized rotational flow model providing the pump designer with an option to simulate various flow conditions at the blade leading edge using a single parameter, which leads to different blade designs. Despite being rotational, this flow model does not allow for creation of helical swirl structures, a feature that is usually sought to be suppressed in a pump impeller. A condition for a flow pattern suitable for a pump hydraulic design is derived using curvilinear coordinates. The variation of the meridional velocity for different choices of the parameter is demonstrated, and the meridional flow field is compared against the turbulent flow. The resulting velocity field is easy to obtain and provides a unified approach to determine the distribution of the blade inlet angles along the leading edge for a range of design requirements.

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Figures

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Fig. 1

Orthogonal curvilinear coordinates in the meridional cross section

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Fig. 2

(a) Velocity profile for the potential flow and Francis method and (b) the impeller main dimensions

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Fig. 3

Example 1: comparison of the meridional velocity contours: CL0.6 (left) and SST (right)

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Fig. 8

Example 3: meridional velocity along the leading edge and its corresponding inlet angle

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Fig. 7

Example 3: comparison of the meridional velocity contours: CL0.6 (left) and SST (right)

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Fig. 6

Example 2: meridional velocity along the leading edge and its corresponding inlet angle

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Fig. 5

Example 2: comparison of the meridional velocity contours: CL0.6 (left) and SST (right)

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Fig. 4

Example 1: meridional velocity along the leading edge and its corresponding inlet angle

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