PERFORMANCE OPTIMIZATION OF ENERGY RECOVERY DEVICE BASED ON PAT WITH GUIDE VANE.

Among the technologies for middle-pressure and low-pressure energy recovery, the influence of guide vane is generally neglected in pump as turbine (PAT) based on centrifugal pumps. For high-pressure energy recovery technology, only few studies have been conducted on PAT with guide vane, and the dynamic and static flow laws between the inverse impeller and guide vanes remain unclear. In this study, by optimizing the key geometric parameters of the impeller with forward-curved blades, the influence of different parameters on its performance was investigated. Results show that when the number of blades is 10 at the same flow rate, the highest efficiency is achieved and the internal flow becomes stable. With the same number of blades, the total head increases gradually with the increase of flow rate, whereas the efficiency increases initially and then decreases. Under the same head, the PAT model with blade outlet angle achieves the highest efficiency, power and the best hydraulic performance. Conclusions obtained in this study have important value for implications to optimize the cavitation of multi-stage PAT. [ABSTRACT FROM AUTHOR]