Evaluation of energy loss in a low-head axial flow turbine under different blade numbers using entropy production method

Israel Enema Ohiemi, Yang Sunsheng, Punit Singh, Yanjun Li and Fareed Osman

Energy, 2023, vol. 274, issue C

Abstract: The internal flow loss characteristics of axial flow turbines (AFT), which are often utilized to generate hydropower, have not yet been completely explored. The flow loss characteristics of the turbine under varied blade numbers (z = 2, z = 3, and z = 4) are examined in this work using a low head AFT as the research object using a combination of entropy production theory and numerical simulation. According to a thorough investigation of entropy generation, the majority of energy losses occur downstream in the wake zone, at the flow channel's edge, and close to the blade tip. The major source of entropy production in the turbine is turbulent dissipation. The findings showed that as the number of blades increased, energy loss decreased. At the leading edge and flow cascade when z = 2 at the design flow rate, peak turbulence dissipation of 581 W/m3 and 39.11 W/m-3 were measured. On the other hand, z = 4 had the lowest levels of dissipation. The optimal blade number, according to the case studies, is z = 4, since it has the lowest energy loss and most efficiency.

Keywords: Low head axial flow turbine; Entropy production method; Blade number; Energy loss; Direct dissipation (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:274:y:2023:i:c:s0360544223006564

DOI: 10.1016/j.energy.2023.127262

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