基于Open FOAM的液压阀流场数值模拟及分析

Numerical Simulation and Analysis of Hydraulic Valve Flow Field Based on Open FOAM

由于目前液压阀的流场结构随开口度的变化趋势尚未得到透彻的研究,针对液压阀在相同压差条件下的流场结构随开口度的变化,利用OpenFOAM开源平台对液压阀的不同阀门开口度开展了数值模拟,分析速度场、漩涡结构以及压力分布,揭示了液压阀的流场结构随开口度的变化情况。结果表明:流场流动与阀门的开口度密切相关。流动的不稳定性伴随着开口度的增大而增大,流动的不稳定性的产生和漩涡相关,且流动具有强烈的时间依赖特性。五种开口度的压力最低的区域均为射流自由剪切层并非在阀体阀门端点处,且负压峰值出现在下游处的自由剪切层,与漩涡的初生位置较为吻合。这将为液压阀的优化设计提供理论基础。

The flow field structure of the hydraulic valve is the trend has not been thorough research,in view of the hydraulic valve under the condition of the same differential pressure flow field structure,along with the change of is using OpenFOAM open-source platform of hydraulic valve valve is different to carry out the numerical simulation of the analysis of the velocity field and vortex structure and stress distribution,The change of the flow field structure of the hydraulic valve with the opening degree is revealed.The results show that the flow field is closely related to the opening degree of the valve.The instability of the flow increases with the increase of the opening degree,and the instability of the flow is related to the vortex,and the flow has a strong time-dependent characteristic.The area with the lowest pressure of the five opening degrees is the free shear layer of the jet which is not at the end of the valve body and the negative pressure peak appears in the downstream,which is consistent with the initial position of the vortex.This will provide a theoretical basis for the optimal design of hydraulic valves.