Research Papers: Flows in Complex Systems

Computational Fluid Dynamics Analysis of Gerotor Lubricating Pumps at High-Speed: Geometric Features Influencing the Filling Capability

[+] Author and Article Information
Giorgio Altare

Dipartimento Energia,
Politecnico di Torino,
Torino 10129, Italy
e-mail: giorgio.altare@polito.it

Massimo Rundo

Dipartimento Energia,
Politecnico di Torino,
Torino 10129, Italy
e-mail: massimo.rundo@polito.it

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 21, 2015; final manuscript received May 13, 2016; published online July 15, 2016. Assoc. Editor: Bart van Esch.

J. Fluids Eng 138(11), 111101 (Jul 15, 2016) (11 pages) Paper No: FE-15-1757; doi: 10.1115/1.4033675 History: Received October 21, 2015; Revised May 13, 2016

The paper presents an extensive analysis of the influence on the suction capacity of the main geometric parameters of gerotor lubricating pumps. The study was carried out using a computational fluid dynamics (CFD) model developed with the commercial software PumpLinx®. The model of a reference gerotor unit was validated experimentally in terms of delivered flow rate in different operating conditions, in open and closed circuit configuration. In the former case, different geometries of the inlet pipe were tested. In the latter, the influence of the suction pressure at constant speed was analyzed. After the model validation, several geometric features were changed to assess their influence on the volumetric efficiency in conditions of incomplete filling, such as the thickness and the diameter of the gears, the position of the inlet pipe with respect to the rotors (radial, axial, and tangential), and the shape of the port plate.

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Fig. 2

Rotor's dimensions

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Fig. 3

Clearance definition

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Fig. 5

Detail of the mesh for the leakages

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Fig. 6

Hydraulic circuit according to International Organization for Standardization

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Fig. 7

Pump under test in closed circuit

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Fig. 8

Flow-pressure curves at 2000 rpm

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Fig. 9

Simulated versus experimental flow-pressure curves

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Fig. 10

Flow—speed curves in open circuit

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Fig. 11

Characteristic curves of the inlet pipe

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Fig. 15

Effect of the inlet direction

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Fig. 17

Effect of the delay angle

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Fig. 18

Flow versus speed as function of the delay angle

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Fig. 19

Effect of the pump displacement

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Fig. 20

Rotor with different external diameters

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Fig. 21

Effect of the external diameter

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Fig. 22

Suction flow area

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Fig. 23

Rotors with different axial heights

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Fig. 24

Effect of axial height

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Fig. 25

Rotors with different numbers of chambers

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Fig. 26

Effect of the number of chambers



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