Experimental flow analysis of vertical axis turbine for power generation in open channel system

Year 2020, Volume: 7 Issue: 4, 126 - 133, 31.12.2020

Bülent Yanıktepe , Ertuğrul Şekeroğlu , Mustafa Söyler , Coskun Özalp

https://doi.org/10.31593/ijeat.806950

Abstract

In this experimental study, flow structure over a three bladed vertical axis Darrieus turbine is investigated experimentally for Reynold Number, Re=9000 in an open channel. Rigidity ratio (σ), angle of attack, optimum values of blade chord length (CL), turbine radius (R) and height of turbine blades (H) are used as approximately 1.1 and α=-2°, CL=5 cm, R=13.75 cm and H=20 cm, respectively. According to the values, ¼ scale model of a vertical axis Darrieus turbine has been used in order to perform experimental flow analysis. In experimental flow analysis, two different azimuth angles, θ=270° and θ=240° are used to examine the flow characteristics in the Particle İmage Velocimetry (PIV) experiments. As a result of the experiments, time averaged velocity vectors , averaged streamlines <Ψ>, and averaged vortex fields <ω>, are obtained and interpreted time averaged velocity vectors , averaged streamlines <Ψ>, and averaged vortex fields <ω>, changes with the turbine blade positions. As a result, it is seen that turbine azimuthal angle affetcs the flow structure and streamline focal points, positive and negative vortex are formed in the flow region behind the turbine. Only one focal point at θ=240° is occurred while two focal points and one stagnation point are occurred at the angle of θ=270°.

Keywords

Darrieus Water Turbine, Energy, Hydraulic Energy, Renewable Energy, PIV

Supporting Institution

TÜBİTAK TEYDEB / Osmaniye Korkut Ata University of Scientific Research Projects Unit / ECC Machine Chemistry Energy Industry and Trade Limited Company

Project Number

7170525 / OKU BAP-2019-PT3-015

Thanks

This study was supported by OKU Scientific Research Projects Unit with the project number OKU BAP-2019-PT3-015 and supported by TÜBİTAK TEYDEB with project number 7170525, we thank both institutions for their support. In addition, we would like to thank the project owner ECC Machine Chemistry Energy Industry and Trade Limited Company for their support.

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