低流阻系数轴流式止回阀的内部流场分析

Analysis of the Internal Flow Field of Low Flow Resistance Coefficient Axial Flow Type Check Valve

为了设计公称直径为DN200的低流阻系数轴流式止回阀,并准确分析其压力损失和流阻特性,在其原有的结构基础上,用汇源法设计止回阀的阀芯结构,得到结构优化后的轴流式止回阀。基于FLUENT(商用计算流体力学)软件提供的标准k-ε两方程湍流模型,对结构优化后的轴流式止回阀进行三维流道数值模拟,求解出不同工况下的压力云图和速度流线图,计算出优化后的止回阀流阻系数在0.272以下,小于优化前的0.4。最后,总结出进口压力、进口速度与流阻系数之间的关系。计算结果表明:在止回阀流道结构保持不变的情况下,影响止回阀流阻系数的主要因素是进口平均速度,随着进口流速的增大,止回阀的流阻系数呈逐渐减小的趋势;在进口速度保持不变的情况下,进口压力的变化对止回阀的流阻系数影响较小。

In order to design the nominal diameter of DN200 low flow resistance coefficient axial flow type check valve,and accurate analysis the pressure loss and flow resistance characteristics in its original structure based on the original structure use the method of singularity distribution to design the core structure of the valve so as to get the optimized structure of the axial flow type check valve. The physical model provided by FLUENT,through three-dimensional to study the internal characteristics of axial flow type check valve obtain pressure contours and streamlines speed under different working conditions,and through the collection and analysis of the results,calculated the pressure lost and flow resistance coefficient get the relationship between inlet pressure,inlet velocity and flow resistance coefficient.The results show that: In the condition of flow structure unchanged,flow resistance coefficient of check valve is mainly decided by average inlet velocity,flow resistance will decline with the increase of inlet velocity while in the condition of velocity unchanged,the effect of inlet pressure change on flow resistance coefficient is very small.