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

Year 2020, , 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.

References

• Şekeroğlu, E. 2019. “Investigation of flow and power parameters of a vertical Axis water turbine for stream application”. Master thesis, Osmaniye Korkut Ata University, Energy System Engineering Department, Osmaniye, Turkey, 1-85.
• Yaniktepe, B., Kara, O. and Ozalp, C., 2017. Technoeconomic evaluation for an ınstalled small-scale photovoltaic power plant. International Journal of Photoenergy, 1–7.
• Yaniktepe, B., Koroglu, T. and Savrun, M. M. 2013. Investigation of wind characteristics and wind energy potential in Osmaniye, Turkey. Renewable and Sustainable Energy Reviews, 21, 703–711.
• Demircan, E. 2014. “Vertical axis water turbine design and analysis for river applications using computational fluid dynamics”. Master Thesis, METU Mechanical Engineering Department, Ankara, Turkey, 57.
• Hwang, I. S., Lee, Y. H., Kim, S. J., Optimization of cycloidal water turbine and the performance improvement by individual blade control. Applied Energy, 86(9), 1532–1540, 2009.
• Alidadi, M. 2009. “Duct optimization for a ducted vertical axis hydro current türbine”. Ph.D. Thesis, The University of British Columbia, Vancouver, 1-122.
• Antheaume, S., Maître, T. and Achard, J. L. 2008. Hydraulic Darrieus turbines efficiency for free fluid flow conditions versus power farms conditions. Renewable Energy, 33(10), 2186–98.
• Li, Y. and Calisal, S. M. 2010. Three dimensional effects and arm effects on modeling a vertical axis tidal current türbine. Renewable Energy, 35(10), 2325–2334.
• Bachant, P. and Wosnik, M. 2016. Effects of reynolds number on the energy conversion and near wake dynamics of a high solidity vertical axis cross flow türbine. Energies, 9(2), 1–18.
• Khan, M. J., Bhuyan, G., Iqbal, M. T. and Quaicoe, J. E. 2009. Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications. A technology status review, Applied Energy, 86(10), 1823–1835.
• Hall, T.J. 2012. “Numerical simulation of a cross flow Marine Hydrokinetic turbine”, Master Thesis, Mechanical Engineering University of Washington, Washington, 1-95.