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research-article

A Mathematical Model for Simulation of Flow Rate and Chamber Pressures in Spool Valves

[+] Author and Article Information
Ahmet Can Afatsun

Mechanical Engineer, Motion Systems Design Dept., Roketsan, Inc.
can.afatsun@roketsan.com.tr

Tuna Balkan

Professor, Mechanical Engineering, Middle East Technical University
balkan@metu.edu.tr

1Corresponding author.

ASME doi:10.1115/1.4041300 History: Received February 16, 2018; Revised August 21, 2018

Abstract

In this paper, a mathematical model to simulate the pressure and flow rate characteristics of a spool valve is derived. To improve the simulation accuracy, the discharge coefficient through the spool valve ports is assumed to be a function of both the Reynolds number and the orifice geometry rather than treating it as a constant. Parameters of the model are determined using the data obtained by computational fluid dynamics (CFD) analyses conducted on 2D axisymmetric domains using ANSYS Fluent 15 commercial software. For turbulence modeling, SST k-w model is preferred after a comparison of performance with the other available turbulence model options. Resulting model provides consistent pressure and flow rate estimations with CFD analyses and a smooth transition between different geometrical conditions. The ultimate aim of this study is to fulfill the need for a model to precisely determine the geometrical tolerances of spool valve components for optimum performance. Estimations of the developed model is compared with the experimental data of a spool valve and the model is proved to be able to accurately estimate the maximum leakage flow rate, the pressure sensitivity and the shapes of leakage flow/load pressure curves.

Copyright (c) 2018 by ASME
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