Flow control in Banki turbines. (October 2017)

• Record Type: Journal Article
• Authors: Popescu, Daniela; Popescu, Constantin; Dragomirescu, Andrei
• Is Part Of: Energy procedia. Volume 136(2017)
• Page Start: 424
• Page End: 429
• Publication Date: 2017-10
• Subjects: Banki turbine -- fluid flow control -- hydro system -- numerical simulation -- renewable energy sources; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2017.10.272
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: Cross flow micro turbines are environmentally friendly equipment. A low head Banki turbine is studied in this paper numerically and experimentally in order to identify the reasons why the turbine efficiency is poor at low rotational speeds. A procedure that consists in dividing the flow domain into different zones is proposed for clarifying the main issues. The turbine efficiency obtained experimentally is explained based on a CFD analysis that highlights the influence of recirculation phenomena and shock losses produced when the water jet impinges on the shaft. This analysis is also used to propose a device for internal flow control.