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Research Papers: Flows in Complex Systems

A Mathematical Model to Analyze the Torque Caused by Fluid–Solid Interaction on a Hydraulic Valve

[+] Author and Article Information
Emma Frosina

Mem. ASME
University of Naples Federico II,
Via Claudio 21,
Naples 80125, Italy
e-mail: emma.frosina@unina.it

Adolfo Senatore

Mem. ASME
University of Naples Federico II,
Via Claudio 21,
Naples 80125, Italy
e-mail: senatore@unina.it

Dario Buono

Mem. ASME
University of Naples Federico II,
Via Claudio 21,
Naples 80125, Italy
e-mail: darbuono@unina.it

Kim A. Stelson

Mem. ASME
University of Minnesota,
Minneapolis, MN 55455
e-mail: kstelson@umn.edu

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 14, 2015; final manuscript received October 26, 2015; published online February 17, 2016. Assoc. Editor: Shizhi Qian.

J. Fluids Eng 138(6), 061103 (Feb 17, 2016) (11 pages) Paper No: FE-15-1264; doi: 10.1115/1.4032295 History: Received April 14, 2015; Revised October 26, 2015

In this paper, a three-dimensional (3D) computational fluid dynamics (CFD) methodology to improve the performance of hydraulic components will be shown, highlighting the importance that a study in the fluid mechanics field has for their optimization. As known, the valve internal geometry influences proportional spool valve hydraulic performance, axial flow forces, and spin effects on the spool. Axial flow forces and spin effects interact directly with the position control performance of a direct actuating closed-loop control valve, reducing its capability. The goal of this activity is the study of the torque on the spool induced by the flow and using a CFD 3D methodology to identify causes of this phenomenon and to find a general mathematical solution to minimize the spool spin effect. The baseline configuration and the new ones of the proportional four-way three-position closed-loop control spool valve have been studied with a mathematical model. The models were also validated by the experimental data performed in the Hydraulic Lab of the University of Naples. In particular, the tests allowed to measure the torque on the spool varying the oil flow rate, using a dedicated test bench layout where the spool was directly connected to a torque meter. Several geometries have been analyzed to find the best one to minimize spool spin behavior while maintaining an acceptable pressure drop. The study results confirmed the significant improvement of overall component performance.

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Figures

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Fig. 1

Proportional spool valve fluid volume

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Fig. 3

Binary tree mesh for the proportional spool valve cross section

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Fig. 7

Flow rate versus pressure

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Fig. 8

Comparison of model and experimental results

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Fig. 6

Tested proportional spool valve

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Fig. 4

Pressure distribution in the fluid volume

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Fig. 5

Test bench hydraulic schematic

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Fig. 15

Flow rate versus pressure

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Fig. 16

Comparison of experimental and model results for flow rate versus pressure

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Fig. 17

Comparison of experimental and model results for flow rate versus torque

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Fig. 9

Pressure distribution inside port P

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Fig. 14

Flow rate versus torque

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Fig. 10

Typical streamlines inside port P

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Fig. 11

Pressure distribution inside port B

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Fig. 12

Typical streamlines inside port B

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Fig. 13

New proportional spool valve design

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Fig. 18

Comparison of streamlines for cases 1 and 4

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Fig. 19

Case 1: (a) turbulent kinetic energy and (b) velocity distribution

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Fig. 20

Case 4: (a) turbulent kinetic energy and (b) velocity distribution

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Fig. 21

Comparison of pressure distribution for cases 1 and 4

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