To explore the spool orifice’s particle motion and erosion morphology in an electro-hydraulic servo valve under a small opening, a modeled particle motion visualization test and CFD calculation were conducted to study typical particle trajectory. The influence of pressure differential, particle shape, and particle diameter on the erosion rate along the working edges was discussed. The erosion characteristic morphology and working edges’ fillet diameter distribution were measured and analyzed. There are four typical particle motions: translation and spin on the wall faced the flow, translation and turn on the backflow wall, carried motion by the mainstream and particle rotation in a vortex. A model of the erosive particle motion of the spool orifice was built based on the visualization test and CFD. During these motions, the microscopic scraping and collision of particles with the working edges are the main causes of erosion wear. The erosion wear rate of the working edge is proportional to the pressure differential and the non-roundness of the particles. The fillet of a working edge periodically increases or decreases with the circumferential angle, which occurs due to the morphology and is consistent with the erosion wear rate distribution along the working edge.

为了探索小开度下电动液压伺服阀中阀芯孔口的颗粒运动和侵蚀形态，进行了建模颗粒运动可视化测试和 CFD 计算，以研究典型的颗粒轨迹。讨论了压差、颗粒形状和颗粒直径对沿工作边缘侵蚀速率的影响。测量和分析了侵蚀特征形态和工作边缘的圆角直径分布。典型的粒子运动有四种：面对流动的壁面上的平移和旋转，回流壁上的平移和转动，主流携带的运动和涡旋中的粒子旋转。基于可视化测试和CFD建立了阀芯孔口侵蚀粒子运动模型。在这些动作中，颗粒与工作边缘的微观刮擦和碰撞是冲蚀磨损的主要原因。工作刃的冲蚀磨损率与压差和颗粒的不圆度成正比。工作刃的圆角随圆周角周期性地增加或减少，这是由于形态而发生的，并且与沿工作刃的冲蚀磨损率分布一致。