管道式Savonius空心涡轮机尾流场不稳定流动特性研究OA

In modern water supply pipeline systems,pipeline type Savonius turbine generators can use the residual pressure of pipeline fluid to generate power for pipeline system detection equipment.In depth research on the internal flow mechanism of Savonius turbines is crucial for improving their efficiency and operational stability.This article takes the DN50 pipeline Savonius turbine as the research object,and analyzes the unstable flow characteristics of the wake flow field of turbines with different structural schemes through numerical simulation methods.The energy gradient theory and dynamic mode decomposition(DMD)combined method are used to study the structural characteristics and motion laws of the unstable flow field in the wake flow field,and the energy loss characteristics caused by unstable flow are analyzed.The results indicate that the hollow structure Savonius turbine effectively suppresses the unstable counter jet phenomenon in the wake flow field and reduces the large-scale disturbance flow caused by uneven distribution of fluid energy gradient.The complex and unstable flow structure in the wake field exhibits periodic fragmentation and dissipation caused by dynamic and static interference.Reduced the output power loss caused by unstable flow and improved efficiency.