The investigation of the flow through the metering section of hydraulic components plays a fundamental role in the design and optimization processes. In this paper the flow through a closed center directional control valve for load -sensing application is studied by means of a multidimensional CFD approach. In the analysis, an open source fluid-dynamics code is used and both cavitation and turbulence are accounted for in the modeling. A cavitation model based on a barotropic equation of state and homogeneous equilibrium assumption, including gas absorption and dissolution in the liquid medium, is adopted and coupled to a two equation turbulence approach. Both direct and inverse flows through the metering section of the control valve are investigated, and the differences in terms of fluid - dynamics behavior are addressed In particular, the discharge coefficient, the recirculating regions, the flow acceleration angle and the pressure and velocity fields are investigated and compared. Copyright © 2009 SAE International.
Metering characteristics of a closed center load - Sensing proportional control valve / Bottazzi, D.; Franzoni, F.; Milani, M.; Montorsi, L.. - In: SAE TECHNICAL PAPER. - ISSN 0148-7191. - 2:2(2009), pp. 66-74. ((Intervento presentato al convegno SAE 2009 Commercial Vehicle Engineering Congress and Exhibition, COMVEC 2009 tenutosi a Rosemont, IL, usa nel 2009 [10.4271/2009-01-2850].
Metering characteristics of a closed center load - Sensing proportional control valve
Bottazzi D.;Milani M.;Montorsi L.
2009
Abstract
The investigation of the flow through the metering section of hydraulic components plays a fundamental role in the design and optimization processes. In this paper the flow through a closed center directional control valve for load -sensing application is studied by means of a multidimensional CFD approach. In the analysis, an open source fluid-dynamics code is used and both cavitation and turbulence are accounted for in the modeling. A cavitation model based on a barotropic equation of state and homogeneous equilibrium assumption, including gas absorption and dissolution in the liquid medium, is adopted and coupled to a two equation turbulence approach. Both direct and inverse flows through the metering section of the control valve are investigated, and the differences in terms of fluid - dynamics behavior are addressed In particular, the discharge coefficient, the recirculating regions, the flow acceleration angle and the pressure and velocity fields are investigated and compared. Copyright © 2009 SAE International.
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