How to Improve the Performance Prediction of a Pump as Turbine by Considering the Slip Phenomenon

Proceedings

Torresi, Marco¹  Capurso, Tommaso²  Stefanizzi, Michele³  Pascazio, Giuseppe⁴ 

[1] Author to whom correspondence should be addressed.;Department of Mechanics, Mathematics and Management (DMMM), Polytechnic University of Bari, 70125 Bari, Italy;Nuovo Pignone, 70123 Bari, Italy;Presented at the 3rd EWaS International Conference on “Insights on the the Water-Energy-Food Nexus”, Lefkada Island, Greece, 27–30 June 2018

关键词: PaT;    slip factor;    1D model;    OpenFOAM;    CFD;   

DOI  :  10.3390/proceedings2110683

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

Nowadays Pumps working as Turbines (PaT) are devices widely used to perform energy recovery in hydraulic grids, thus improving their overall efficiency, and to build small hydropower plants. In this work, a centrifugal pump has been numerically investigated in turbine operating mode by means of the open-source CFD code OpenFOAM with emphasis on the flow field at the runner outlet. Due to the reduced number of blades in a PaT, the mean outlet relative velocity angle differs from the blade angle. In order to account for this phenomenon, the slip factor is introduced. The slip factor is investigated and its application to a 1D model is shown in order to highlight the improvement in predicting the characteristic curve of a centrifugal pump used in reverse mode as a turbine (PaT) especially at its part-load.

【 授权许可】

CC BY