Abstract

In this paper an accurate numerical method has been used to verify the influence of the spool velocity on the performance of a directional hydraulic valve (4/3, closed center): the flow during the opening phase of the valve has been solved by Direct Numerical Simulation (DNS), using an Immersed-Boundary (IB) technique. The present results have been compared with the ones of a previous study, based on the same numerical method, but with a stationary spool. The numerical comparisons prove that the "quasi-stationary" hypothesis is approximately correct for present commercial devices, but it is not suitable for future high-speed valves. However it is shown that, even inside the range of the spool velocities currently adopted, for small pressure drops Δp and small openings s more significant differences arise on the axial forces.

Autore Pugliese

• Lippolis Antonio Donato , Oresta Paolo

Tutti gli autori

• Posa A. , Oresta P. , Lippolis A.

Titolo volume/Rivista

INTERNATIONAL JOURNAL OF FLUID POWER

Anno di pubblicazione

2013

ISSN

1439-9776

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

1

Ultimo Aggiornamento Citazioni

2017-04-22 03:20:59

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile