轴流式止回阀的流动场协同分析与减阻设计

为了分析轴流式止回阀流阻性能，探究阀内结构优化设计方法，引入场协同原理，将该原理从层流推广至湍流.利用Fluent软件对2种不同型号（优化前、后）阀门的内流场进行数值模拟和流动场协同分析，得到压降、流速分布、流动场协同角余弦值分布和有效黏性系数.结果表明：优化后阀内流体的速度场与速度梯度场整体上的协同程度更差，有效黏性系数更小，减阻效果明显，能耗降低；通过对比分析流速分布和流动场协同角余弦值分布，还能从局部流动场协同的角度揭示流阻的变化机理.基于流动场协同原理在流动减阻研究中的优势，提出2种阀结构优化设计的思路.
Abstract: The field synergy principle was introduced and extended from laminar flow to turbulent flow in order to analyze flow drag reduction characteristics and optimal design method of non-slam check valve. The flow field in two different valves (before and after optimized) was simulated and analyzed by Fluent software. Pressure drop, velocity distribution, the cosine distribution of field synergy angles and effective viscosity coefficient were obtained. In the valve after optimized, the synergy between the velocity field and the velocity gradient field is worse, the effective viscosity coefficient is smaller, the flow resistance and the energy consumption are reduced. From the perspective of local flow field synergy principle, the mechanism of flow resistance change can be revealed by comparing velocity distribution with the cosine distribution of field synergy angles. Two approaches for optimizing valve design were proposed taking advantage of the field synergy principle in flow drag reduction study.