液压锥阀启闭过程及空化的研究

Study on Opening and Closing Process and Cavitation of Hydraulic Cone Valve

在锥阀启闭过程中,阀口处流道形状较为复杂,这会促使阀口处产生空化,从而对液压系统的稳定性和可靠性产生不利影响。通过OpenFOAM 3个分支版本的foam-extend-4.1开发出应用浸没边界法的两相空化流动求解器,使用该求解器在阀芯启闭过程及阀口空化的数值模拟研究中尝试应用浸没边界法且得到了较好的计算效果。研究表明,开阀时的空化是因为阀口处高速射流所导致的射流空化,关阀时的空化是由于液压油惯性导致的二次空化。

During the opening and closing process of the cone valve,the shape of the flow channel at the valve port is relatively complex,which can cause cavitation at the valve port and have adverse effects on the stability and reliability of the hydraulic system.A two-phase cavitation flow solver using the immersed boundary method was developed using the three branch versions of OpenFOAM,foam-extend-4.1.This paper attempts to apply the immersed boundary method in the numerical simulation research of valve core opening and closing process and valve port cavitation,and has achieved god computational results.Study has shown that cavitation during valve opening is caused by high-speed jet flow at the valve port,while cavitation during valve closing is secondary cavitation caused by hydraulic oil inertia.