基于动网格6DOF方法的液压阀流场特性分析

Flow Field Characteristic Analysis of Valve Based on Dynamic Mesh 6DOF Technique

利用计算流体动力学软件FLUENT中的6DOF模块模拟插装阀阀芯开启过程中的非定常流场,阀芯运动由其所受流体力确定,当阀芯受力达到平衡时,阀芯停止运动。将阀芯处于稳定时阀芯位移、控制腔压力、阀芯所受稳态液动力的仿真计算结果与理论公式计算值进行了比较,并对阀芯开启过程中的瞬态压力场、速度场进行了分析。结果表明,该仿真计算与理论计算值误差较小,具有较高的可靠性;与以往研究方法相比,该方法与阀芯实际运动更加接近。本研究能够较真实地模拟液压阀开启过程中的瞬态流场特性,为进一步研究液压阀性能提供重要理论依据。

The numerical simulation and visualization research of internal flow field of hydrau- lic valve have become one of the important directions in the field of fluid power transmission. But the present numerical analyses are limited to the steady model or constant spool movement veloci- ty, thus impossible to simulate real transient flow field. In this paper, the transient flow field of the cartridge valve in the opening process is simulated by combining computational fluid dynamics software FLUENT with 6DOF model of dynamic mesh technique. The movement of the spool is decided by flow force which exerts on it. The spool stops moving when the forces are balanced. This method makes it easier to realize transient simulation and prevents writing more complex UDF functions. By comparing numerical simulation results about the valve displacement, pres- sure of the control chamber and the steady flow force with the theoretical formula calculation val- ues, the results show that the numerical results are the same with theoretical value. So the pro- posed method is feasible to simulate the flow state in the opening process of hydraulic valve. And on this basis, the transient pressure field and velocity field of valve camber in the opening process of the valve are researched, which provides important theoretical basis for further research on hy- draulic valve performance.