基于熵产理论的竖井贯流泵流动损失特性

为了研究竖井贯流泵流动损失特性，基于URANS方法，采用FBM-CC湍流模型对竖井贯流泵内部流场进行了非定常计算，并利用熵产理论对不同流量工况下竖井贯流泵各部件的流动损失特性进行了定量分析。结果表明:FBM-CC湍流模型能够有效预测竖井贯流泵水力性能，与试验结果较为吻合；竖井贯流泵流动损失从大到小依次为叶轮段、出水流道、导叶体、进水流道；叶轮段能量损失的主要来源是湍流耗散，其熵产比率最高可达92%；涡流和流动分离导致出现局部高熵产区域；临界失速工况叶轮轮毂处存在大量涡流，轮缘处流动相对较稳定；深度失速工况受叶顶间隙泄漏流影响，叶轮进口轮缘处出现流动分离，随着流量进一步减小进水流道流态受到影响，叶片前缘出现分离涡。

Flow loss characteristics of a shaft tubular pump based on entropy production theory

To study the flow loss characteristics of a shaft tubular pump, the FBM-CC turbulence model was used to conduct unsteady calculations on the internal flow field of the shaft tubular pump based on the URANS method. The entropy production theory was used to quantitatively analyze the flow loss characteristics of the shaft tubular pump under different flow conditions. The result shows that the FBM-CC turbulence model can effectively predict the hydraulic performance of the shaft tubular pump, which is in good agreement with the experimental results. The flow loss of the shaft tubular pump is in the order of the impeller, outlet channel, guide vane and inlet channel. The main source of impeller energy loss is turbulent dissipation, accounting for up to 92%. Vortex and flow separation can lead to local high entropy production areas. Large number of vortices exist at the impeller hub in critical stall conditions and the flow at the rim is relatively stable. The deep stall conditions are affected by the tip leakage flow, and flow separation occurs at the impeller inlet rim. As the flow rate is further reduced, the streamline of the inlet channel is affected and separation vortices appear at the leading edge of the blade.