The paper investigates, by means of a 3D, steady-state, incompressible and isothermal CFD analysis, the influence of the notch shape and number on proportional directional control valves metering edge characteristics. The numerical activity is firstly performed for a sharp metering edge, considered as reference case.Then, different configurations of notched metering edges are considered, coming from the adoption of two notch geometrical shapes largely used in proportional directional control valves actual design, and from a symmetrical displacement of two, three and four notches on the spool periphery. For all the cases considered, the qualitative analysis of the internal flow field is performed in order to highlight the fluid efflux main characteristics.After, a quantitative analysis of the metering characteristics is introduced, with the aim of determining the influence of the metering configuration, of the spool position and of the operating conditions on the efflux characteristics (the discharge coefficient and the jet angle).

The Influence of the Notch Shape and Number on Proportional Directional Control Valve Metering Characteristics / Borghi, Massimo; Milani, Massimo; Paltrinieri, Fabrizio. - In: SAE TRANSACTIONS- JOURNAL OF COMMERCIAL VEHICLES. - STAMPA. - 113, Sect. 2:(2005), pp. 147-156.

The Influence of the Notch Shape and Number on Proportional Directional Control Valve Metering Characteristics

BORGHI, Massimo;MILANI, Massimo;PALTRINIERI, Fabrizio
2005

Abstract

The paper investigates, by means of a 3D, steady-state, incompressible and isothermal CFD analysis, the influence of the notch shape and number on proportional directional control valves metering edge characteristics. The numerical activity is firstly performed for a sharp metering edge, considered as reference case.Then, different configurations of notched metering edges are considered, coming from the adoption of two notch geometrical shapes largely used in proportional directional control valves actual design, and from a symmetrical displacement of two, three and four notches on the spool periphery. For all the cases considered, the qualitative analysis of the internal flow field is performed in order to highlight the fluid efflux main characteristics.After, a quantitative analysis of the metering characteristics is introduced, with the aim of determining the influence of the metering configuration, of the spool position and of the operating conditions on the efflux characteristics (the discharge coefficient and the jet angle).
113, Sect. 2
147
156
The Influence of the Notch Shape and Number on Proportional Directional Control Valve Metering Characteristics / Borghi, Massimo; Milani, Massimo; Paltrinieri, Fabrizio. - In: SAE TRANSACTIONS- JOURNAL OF COMMERCIAL VEHICLES. - STAMPA. - 113, Sect. 2:(2005), pp. 147-156.
Borghi, Massimo; Milani, Massimo; Paltrinieri, Fabrizio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/448802
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