Research On Electro Hydraulic Proportional Relief Valve Model Based On AMEsim And STAR CCM Joint Simulation

Benefit from the rapid development of computer,microelectronics,automatic control,communication technology and other new technologies,CFD technology is widely used in the analysis of various fluid scenarios and the design of related products with its unique advantages of convenience,efficiency and low cost.The application of CFD technology to analyze the flow field problem greatly facilitates the study of control valve,which is in line with the high demand of modern engineering for the control accuracy of hydraulic control system.Electro hydraulic proportional control system is a common hydraulic control system,which is widely used in the field of industry and agriculture.Among them,the electro-hydraulic proportional relief valve is an important part of the electro-hydraulic proportional control system,and its control level directly determines the performance of the system.In order to meet the needs of industrial upgrading and improving the control accuracy of control valve,AMESim and star CCM software are used to study the model characteristics of pilot type electro-hydraulic proportional relief valve,which provides data support for improving the working performance of control valve and completes the following works:(1).Build the mathematical model of electro-hydraulic proportional relief valve,analyze the mechanism of hydraulic force formation and clarify the theoretical calculation formula and numerical calculation method of hydraulic force.In this paper,the principle of CFD numerical calculation and related mathematical theory are briefly introduced,and the calculation model of flow field characteristics of slide valve is established.(2).Establish the collaborative simulation model and independent simulation model of the throttling area of the slide valve.The internal flow field characteristics of the hydraulic oil flowing through the throttle port are analyzed theoretically.The relationship among the flow coefficient,pressure drop,valve opening,inlet jet angle and steady-state hydrodynamic force in the joint simulation model is analyzed.(3).Build a test bench to verify the accuracy of the joint simulation model relative to the single simulation model.The results show that the joint simulation model has a higher degree of fitting with the experimental data than the single simulation model.The compensation of steady-state hydrodynamic force is also discussed.Based on the simulation and test data,the turbine blade shape structure is designed on the pressure equalizing groove of the valve core to compensate the axial steady-state hydrodynamic force.The effect of the optimized spool valve on improving the pressure control accuracy is verified by the test.The results show that the optimized spool valve can effectively compensate the steady-state hydrodynamic force.