Research Papers: Flows in Complex Systems

Lumped Parameter and Three-Dimensional Computational Fluid Dynamics Simulation of a Variable Displacement Vane Pump for Engine Lubrication

[+] Author and Article Information
Massimo Rundo

Department of Energy,
Politecnico di Torino,
Turin 10129, Italy
e-mail: massimo.rundo@polito.it

Giorgio Altare

Department of Energy,
Politecnico di Torino,
Turin 10129, Italy
e-mail: giorgio.altare@polito.it

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 11, 2017; final manuscript received December 10, 2017; published online January 30, 2018. Assoc. Editor: Kwang-Yong Kim.

J. Fluids Eng 140(6), 061101 (Jan 30, 2018) (9 pages) Paper No: FE-17-1494; doi: 10.1115/1.4038761 History: Received August 11, 2017; Revised December 10, 2017

The paper describes the modeling and the experimental tests of a variable displacement vane pump for engine lubrication. The approach used for the simulation has involved three-dimensional (3D) commercial tools for tuning a zero-dimensional (0D) customized model implemented in the LMS Amesim® environment. Different leakage paths are considered and the axial clearances are variable to take into account the deformation of the pump cover, calculated through a finite element analysis with ANSYS. The vane tip clearances are calculated as function of the dynamic equilibrium equation of the vanes. The displacement control takes into account the internal forces on the stator due to the pressure in all variable chambers and to the contact force exerted by the vanes. The discharge coefficients in the resistive components have been tuned by means of a complete 3D transient model of the pump built with PumpLinx®. The tuned 0D model has been proved to be reliable for the determination of the steady-state flow-speed and flow-pressure curves, with a correct estimation of the internal leakages and of the pressure imposed by the displacement control. The pump has been also tested using a simplified circuit, and a fair agreement has been found in the evaluation of the delivery pressure ripple.

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Fig. 1

3D view of the reference pump

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Fig. 2

Hydraulic scheme of the displacement control

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Fig. 3

Hydraulic scheme of the test rig

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Fig. 4

Connection of the pump with the test rig with the detail of the transducer position

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Fig. 5

Geometric parameters of the pump

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Fig. 6

Evaluation of chamber volume and flow area

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Fig. 7

Leakage passageways in the rotary assembly

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Fig. 8

Leakages across the stator

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Fig. 9

Model of the pump implemented in LMS Amesim

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Fig. 10

Normalized cover deformation at 6 bar

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Fig. 11

Model of the pump in PumpLinx® in the configuration 2

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Fig. 12

Flow-pressure curves at 120 °C

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Fig. 13

Flow-speed curves at 40 °C and fixed displacement

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Fig. 14

Pressure-speed curve at 100 °C with load generated by a fixed restrictor

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Fig. 15

Simulated pressure field at the pump outlet at 3000 rpm and 100 °C

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Fig. 16

Pressure ripple measured by the transducer P1 with the load generated by a fixed restrictor at 40 °C and different pump speeds



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