中文摘要：

2D高频转阀是利用阀芯双自由度运动而设计的一种转阀，阀芯高速旋转时，阀口油液流速的变化对阀芯会产生周期性的液动力矩，干扰阀芯的正常驱动，甚至影响2D高频转阀的正常工作。对不同结构阀芯的2D高频转阀阀腔流场进行了数值计算，研究阀芯结构变化对阀芯沟槽流体近壁平均压力、近壁平均流速和阀芯液动力矩的影响，研究结果表明3号和4号阀芯单元结构布局合理，且阀芯沟槽底面高度h越大，液动力矩变化越平稳，阀口流量越大。

英文摘要：

Two-dimensional high-frequency rotary valve is a kind of rotary valve designed by using spool with two degrees of freedom. When the spool rotates at a high speed, the velocity variation of fluid flowing through the valve ports generates periodic hydraulic torque on the spool, which imposes negative effects on the spool movement or even adversely affects the function of the valve. By calculating the flow fields in the chamber of 2D high-frequency rotary valve with different spool geometrical configurations, the influences of different geometrical dimensions on the average pressure and the average velocity around the notch walls and the flow moment imposed on the spool are presented. The results show that the structure and the layout of No. 3 spool unit and No. 4 are reasonable, and that the greater the spool groove bottom height h is, the more smoothly the hydraulic moment changes and the greater the flow rate through the valve port is.