CFD Numerical Analysis And Visualizing Research On The Flow Field Inside Water Hydraulic Control Valve

Water hydraulics, as a kind of new technology, is widely cared because of its environment-protections and energy-savings. Water hydraulics will take place of oil hydraulics step by step. Spool valves and poppet valves are not only the key components but also the main components for energy loss, so the property of water hydraulic valves is significant for water hydraulic control system. Because the operation in water hydraulic valves is controlled by flow fluid and the pressure drop results from energy loss of flow fluid past valve channel, the flow state of fluid in valves becomes the most important factor for the operational property of valves.Hydraulic pound, vibrate, noise and cavitation are the main difficult problems in water hydraulic valves, and finite element numerical analysis is proved to be an effective computational method, so numerical simulation and visualizing research on the flow field in water hydraulic valves by applying finite volume method is very important.Here are three parts in this thesis: Building steady state model and transient model for water hydraulic valves. Research on the property of flow field inside water hydraulic valves. Analysis of the force on water hydraulic valves. After simulating the model of water hydraulic valves, the velocity distribution, pressure distribution, energy distribution can be obtained and relations between the valve channel and the energy loss, the negative pressure distribution can be analyzed, which offers the theory foundation for designing water hydraulic valves with the high efficiency, low energy loss and low noise. At the same time, the pressure of dynamic state in different opening and closing velocities can be gained, on the basis of results the axial hydraulic force and the fluid force can be calculated, which offers reference and guide foundations for accurately calculating the drive force on water hydraulic valves.