不同结构阀芯的滑阀流场CFD分析

以小通径滑阀为研究对象,针对阀芯凹角处旋涡对滑阀内部流场及性能的影响,提出了将阀芯凹角改进为圆弧型,用CFD软件Fluent对仿真模型进行稳态研究,得到了阀内流场的速度和湍动能分布规律:在开口恒定,入口流量相同的条件下,随着圆弧半径的增大,阀内最大速度和最大湍动能减小,但并不能完全抑制阀芯凹角处旋涡的产生。结合阀内流场流线图,将圆弧型结构进一步改进为斜角加圆弧型。对比分析表明,斜角加圆弧型结构可更有效平缓流场,抑制阀内旋涡的产生和发展,降低阀内湍动能的损失,提高能量利用率。

Flow Field Analysis for Spool Valve with Different Structure Spools

The small-diameter spool valve is the object of this study. In order to reduce the effect of the vortex on the flow field and the performance of the spool valve, we propose to improve the spool structure into arc-type structure. We use the CFD software Fluent to study the steady state of the simulation model, and obtain the velocity and turbulent energy distribution in the spool valve. When the opening and inlet flow are constant in all cases, with the increase of the radius of the arc, the maximum velocity and the turbulent kinetic energy are reduced in the valve. But the generation of the vortex can not br inhibited completely. Guided by streamlines in the valve, the arc-type structure is improved into beveled arc-type structure. The analysis shows that the beveled arc-type structure can smooth the flow field more effectively, inhibit the generation and development of the vortex, reduce the loss of turbulent kinetic energy, and improve the energy efficiency.