Title: Numerical investigation of lucid spherical cross-axis flow turbine concerning changeover on its geometrical parameters in a pipeline compared to a channel

Authors: Hamid-reza Zarei; Mahmoud Pasandidehfard

Addresses: Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran ' Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract: This paper presents an investigation on the performance of a lucid spherical turbine. To verify the numerical predictions the experimental results of Bachant and Wosnik have been used. Drag and power coefficients have been used to compare with the data for the water inlet velocity 1 m/s and different non-dimensional tip-speed-ratio. Two airfoil sections, NACA 2412 and NACA 64(3)418, have been selected to design the turbine blades. The impact of four effective blade parameters, inclusive of profile section, chord length, number of blades, and blade twist angels, on turbine performance, is investigated. It can deduce that the power coefficient has increased up to 22% for NACA 2412 compared to the experimental test. Also, the three-bladed turbine possesses the best results among all models. The twist of the blades caused to increase in the power coefficient by 19% and 31% for NACA 2412 and NACA 64(3)418 sections inside the channel respectively.

Keywords: lucid turbine; asymmetric hydrofoils; lift coefficient; power coefficient; pipeline.

DOI: 10.1504/PCFD.2024.142063

Progress in Computational Fluid Dynamics, An International Journal, 2024 Vol.24 No.6, pp.333 - 351

Received: 29 Jul 2023
Accepted: 11 Mar 2024
Published online: 07 Oct 2024 *

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