| As a key part in the electro-hydraulic control system of hydraulic support, the directional valve plays a vital role in the development of this system. Most of existing directional valves are driven by a pilot driving mechanism, whose pilot valve has small size, complex structure, and is under bad work condition. The pilot valve's development has been severely restricted by the problems such as vibration, noises, and cavitation. Therefore, it is significant to study the dynamical performances of this solenoid pilot valve.Based on the fluid dynamics theory, this thesis explores the dynamical performances of the flow field inner the valve by using the Computational Fluid Dynamics(CFD)software. First of all, establish steady model of the solenoid pilot valve, as the valve move to its maximum opening, high pressure and high velocity performance of the fluid inner the valve has been gotten. At the same time, there are several flowing whirlpools existing inner the valve, but cavitation phenomenon are nor existed under the ideal working condition when neglects the temperature effects. For the steady-state case, the flowing state and flowing trend of the fluid under different boundary conditions or different openings are compared. By comparing the results, it is found that in different boundary conditions or different openings, the pressure and speed value of the fluid inner the valve are different, and its swirling intensity is variable.This thesis carries out a dynamic analysis on the flow field inner the valve besides the steady-state analysis. Through defining the different moving speed, compare the flowing performance in different driving conditions. The simulation result shows that the faster the valve moves, the better the valve's performance will be gotten. By comparing dynamic results with steady-state results, dynamic analysis results can found a more reliable and solid theoretical basis for optimization design of the solenoid pilot valve.
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