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Technical Paper

CFD Simulations of Oil Flow and Flow Induced Forces Inside Hydraulic Valves

2002-03-19
2002-01-1376
This paper describes a method of using Computational Fluid Dynamics (CFD) computer simulations for hydraulic oil flow inside hydraulic valves. The main objective is to study hydraulic forces induced by oil flow on the actuators of hydraulic valves with the aim of minimizing their effects. Integration of solved pressure and velocity fields from CFD simulation solutions over related valve component surface areas was employed to obtain the desirable Flow Induced Force (FIF). Different valve metering geometry has been simulated using a commercially available ANSYS/FLOTRAN CFD software program. The hydraulic oil flow inside valves is assumed steady-state and in a turbulent mode. The complete simulation procedure is presented from parametric geometry creation with 3-D solid CAD modeler of Pro/ENGINEER through final post-processing of results. Simulation results of three hydraulic valve applications are presented. Tests have been performed to measure FIF and oil flow rates.
Technical Paper

Improving Spool Valve Operating Effort Using CFD

2004-10-26
2004-01-2620
Hydraulic oil flow and flow induced forces inside hydraulic spool valves have been studied using a commercially available Computational Fluid Dynamics (CFD) software package with an aim of improving hydraulic spool valve operating efforts. The main objective is to investigate flow induced forces on the spool with a range of different geometries or operating conditions and therefore to minimize or utilize their effect on spool effort. This CFD problem was treated as incompressible, turbulent, steady and adiabatic or isothermal. Integration of solved pressure field from a commercial CFD solution over related a valve component surface area was used to integrate the desirable flow induced forces. Additional viscous drag forces on the spool effect on total spool operating effort have also been investigated. The focus in this article is mainly based on studies for open center flow type four-way spool valves in cases such that the hydraulic oil flow direction towards spool.
Technical Paper

Predicting Hydraulic Valve Pressure Drop Using CFD

2005-11-01
2005-01-3635
Commercial Computational Fluid Dynamics (CFD) code ANSYS/Flotran has been used to simulate hydraulic oil flow inside valves. The fluid flow inside valve is treated as turbulent and adiabatic or iso-thermal. The CFD simulations presented in this paper have been carried out for the purpose of predicting hydraulic oil flow pressure drop inside hydraulic valves under certain operating conditions with the aim to minimize the pressure losses. The complete simulation procedure will be presented from parametric geometry creation with a 3-D solid CAD through final post-processing of results. Simulation results of different multiple-spool monoblock hydraulic valves are included. CFD simulation results are compared to experimental results. Some CFD model mesh sensitivity analysis result is also presented.
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