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14:35 ics Großer Saal
Comparison of spool radial grooves influence between water and oil hydraulics
Franc Majdic, University of Ljubljana, Slovenia
In this paper numerical flow calculations through the annular gaps with added radial grooves normaly used on the spools of directional control valves were carried out. The impact of various annular gap geometries and radial grooves in variable pressure conditions and while using of different hydraulic fluids on flows through annular gaps were investigated at different flow regimes. Samples of different geometry and number of radial groves on spool of directional control valve were also made for the purpose of carrying out flow measurements. The two different hydraulic fluids that were used in the numerical simulations and flow measurements were mineral hydraulic oil and tap water. The results of the numerical calculations of different models of axially symmetric geometries radial grooves show the impact on the internal leakage in three different regimes of flow. The results of numerical calculations by using hydraulic oil, show a trend that was established in the experimental part.