Fluid-solid coupling analysis of hydraulic poppet valves based on CFD

The purpose of this article is to obtain the transient distribution of flow and valve core stress of the hydraulic poppet valve during opening process. Based the dynamic mesh technology and fluid-solid theory, a numerical model was established using the CFD software. Through comparing the steady displacement simulation results with theoretical values, motion situations of flow, it is shown that the stress of a fixed area changes during the opening process of the valve plug, and the pressure gradient is very large in the valve port. There is a "negative pressure" area in the flow field and the size keeps changing with time, which may cause cavitations. Furthermore, the stress distributions are different even though the displacements of the valve plug are the same due to different velocities at different time. These results provide the basis for the design and optimization of hydraulic poppet valves.