A1 Journal article (refereed), original research

Radial Flow Force at the Annular Orifice of a Two-Dimensional Hydraulic Servo Valve

Open Access publication

Publication Details

Authors: Lu Qianqian, Tiainen Jonna, Kiani-Oshtorjani Mehran, Ruan Jian

Publisher: Institute of Electrical and Electronics Engineers (IEEE): OAJ / IEEE

Publication year: 2020

Language: English

Related journal or series: IEEE Access

eISSN: 2169-3536

JUFO level of this publication: 2

Digital Object Identifier (DOI): http://dx.doi.org/10.1109/ACCESS.2020.3038571

Permanent website address: https://ieeexplore.ieee.org/document/9261486

Open Access: Open Access publication


A two-dimensional hydraulic servo valve is an innovative servo control
element that provides hydraulic systems with a high power-to-weight
ratio, great anti-pollution potential, and superior static and dynamic
characteristics. The spool of such a valve is subject to two degrees of
freedom: rotation around and sliding along the spool axis, to accomplish
both pilot control and flow amplifier functions. The structure of the
spool at the main stage is similar to that of a traditional slide valve
wherein the asymmetrical distribution of the oil paths manufactured in
the valve body produces circumferential unevenness in the radial flow
force to the spool at the annular orifice, in line with the momentum
theory. Three-dimensional computational fluid dynamics analysis of the
flow field revealed that the radial flow force at the annular orifice
increases sharply with inlet flow velocity and decreases as the orifice
opening grows, while changes in outlet pressure do not affect the levels
or distribution of this force. Also, net radial force at the annular
orifice increases with both inlet velocity and opening size. The paper
presents results demonstrating that the net radial force from fluid flow
through the orifice could increase friction resistance and cannot be
safely ignored, especially under high-flow-rate conditions.

Last updated on 2021-16-03 at 12:47