Numerical Investigation of Modified Bach Type Vertical Axis Wind Turbine

Abstract:

This study evaluates the performance and flow behaviour over the modified Bach type Vertical Axis Wind Turbine. A two dimensional unsteady state analysis is carried out in this study. The unsteady Reynolds Averaged Navier-Stokes equation and the turbulence equation corresponding to SST k-ω turbulence model are solved using commercial software ANSYS FLUENT 13. A grid independence study is performed to choose optimum mesh elements. The simulation is carried out and performance parameters like power coefficient and torque coefficient are calculated. The results are compared with the available experimental data for validation purpose and these matched with numerical values. An improved performance of around 37% C_p is observed for modified Bach type over simple Savonius rotor. Moreover, a brief analysis of flow behaviour over the rotor is studied.

• Periodical: Applied Mechanics and Materials (Volume 852)
• Pages: 551-557
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.852.551
• Online since: September 2016
• Authors: R. Sarath Kumar, T. Micha Premkumar*, Sivamani Seralathan, T. Mohan
• Keywords: Computational Fluid Dynamics (CFD), Modified Bach Type, Savonius, Vertical Axis Wind Turbine

References

[1] U.K. Saha, M. Jaya Rajkumar, On the performance analysis of Savonius rotor withtwisted blades, Journal of renewable energy (2006)1776–1788.

DOI: 10.1016/j.renene.2005.08.030

[2] Keum Soo Jeon, Jun Ik Jeong, Jae-Kyung Pan, Ki-Wahn Ryu, Effects of end plates with various shapes and sizes on helical Savonius wind turbines, Journal of renewable energy 79 (2014)167-176.

DOI: 10.1016/j.renene.2014.11.035

[3] J. Kumbernuss, J. Chen, H.X. Yang, L. Lu. Investigation into the relationship of the overlap ratio and shift angle of double stage three bladed vertical axis wind turbine (VAWT), 107-108 (2012) 57-75.

DOI: 10.1016/j.jweia.2012.03.021

[4] Sukanta Roy, Ujjwal K. Saha. Wind tunnel experiments of a newly developed two-bladed Savonius-style wind turbine, Applied Energy 137 (2015) 117–125.

DOI: 10.1016/j.apenergy.2014.10.022

[5] M.A. Kamoji, S.B. Kedare, S.V. Prabhu. Performance tests on helical Savonius rotors, Renewable Energy 34 (2009) 521–529.

DOI: 10.1016/j.renene.2008.06.002

[6] A. Damak, Z. Driss, M.S. Abid. Experimental investigation of helical Savonius rotor with a twist of 180, Renewable Energy 52 (2013) 136-142.

DOI: 10.1016/j.renene.2012.10.043

[7] Sukanta Roy, Ujjwal K. Saha. Wind tunnel experiments of a newly developed two-bladed Savonius-style wind turbine, Applied Energy 137 (2015) 117–125.

DOI: 10.1016/j.apenergy.2014.10.022

[8] Khandakar Niaz Morshed, Mosfequr Rahman, Gustavo Molina and Mahbub Ahmed, Wind tunnel testing and numerical simulation on aerodynamic performance of a three-bladed Savonius wind turbine, International Journal of Energy and Environmental Engineering 4 (2013).

DOI: 10.1186/2251-6832-4-18

[9] C. R. Patel, V. K. Patel, S. V. Prabhu, T. I. Eldho, Investigation of overlap Ratio for Savonius type vertical axis hydro turbine, International Journal of Soft Computing and Engineering 3(2) ( 2013).

[10] Giovanni Gerardo Muscoloa, Rezia Molfinob, From Savonius to Bronzinus: a comparison among vertical wind turbines, Energy Procedia 50 ( 2014 ) 10-18.

DOI: 10.1016/j.egypro.2014.06.002

[11] Mohammed Shaheen, Mohamed El-Sayed, Shaaban Abdallah, Numerical study of two-bucket Savonius wind turbine cluster, J. Wind Eng. Ind. Aerodyn. 137 (2015) 78–89.

DOI: 10.1016/j.jweia.2014.12.002

[12] Jae-Hoon Lee, Young-Tae Lee, Hee-Chang Lim. Effect of twist angle on the performance of Savonius wind turbine. Renewable Energy 89 (2016) 231-244.

DOI: 10.1016/j.renene.2015.12.012

[13] M. Goodarzi , R. Keimanesh, M. Goodarzi, R. Keimanesh, Numerical analysis on overall performance of Savonius turbines adjacent to a natural draft cooling tower. Energy Conversion and Management 99 (2015) 41–49.

DOI: 10.1016/j.enconman.2015.04.027

[14] M.H. Mohamed, G. Janiga, E. Pap, D. Thévenin. Optimization of Savonius turbines using an obstacle shielding the returning blade. RenewableEnergy 35 (2010) 2618-2626.

DOI: 10.1016/j.renene.2010.04.007

[15] David Afungchui, Baddreddinne Kamoun , Ali Helali , Abdellatif Ben Djemaa, The unsteady pressure field and the aerodynamic performances of a Savonius rotor based on the discrete vortex method, Renewable Energy 35 (2010) 307–313.

DOI: 10.1016/j.renene.2009.04.034

[16] João Vicente Akwa, Gilmar Alves da Silva Júnior, Adriane Prisco Petry, Discussion on the verification of the overlap ratio influence on performance coefficients of a Savonius wind rotor using computational fluid dynamics, Renewable Energy 38 (2012).

DOI: 10.1016/j.renene.2011.07.013

[17] M.H. Nasef, W.A. El-Askary, A.A. AbdEL-hamid, H.E. Gad, Evaluation of Savonius rotor performance: Static and dynamic studies. J. Wind Eng. Ind. Aerodyn. 123 (2013)1-11.

DOI: 10.1016/j.jweia.2013.09.009

[18] U.K. Saha, S. Thotla, D. Maity, Optimum design configuration of Savonius rotorthrough wind tunnel experiments. Journal of Wind Engineering and Industrial Aerodynamics, 96 (2008) 1359– 1375.

DOI: 10.1016/j.jweia.2008.03.005

[19] Konrad Kacprzak, GrzegorzLiskiewicz, Krzysztof Sobczak, Numerical investigation of conventional and modified Savonius wind turbines, Renewable Energy 60 (2013) 578-585.

DOI: 10.1016/j.renene.2013.06.009

[20] W.A. El-Askary, M.H. Nasef, A.A. Abd EL-hamid, H.E. Gad, Harvesting wind energy for improving performance of Savonius rotor, J. Wind Eng. Ind. Aerodyn. 139 (2015) 8–15.

DOI: 10.1016/j.jweia.2015.01.003

[21] Y.X. Yao, Z.P. Tang, X.W. Wang, Design based on a parametric analysis of a drag driven VAWT with a tower cowling, J. Wind Eng. Ind. Aerodyn. 116 (2013) 32–39.

DOI: 10.1016/j.jweia.2012.11.001

[22] S. MCtavish, D. Feszty, T. Sankar. Steady and rotating computational fluid dynamics simulations of a novel vertical axis wind turbine for small-scale power generation, Renewable Energy 41 (2012) 171-179.

DOI: 10.1016/j.renene.2011.10.018

[23] Tong Zhou, Dietmar Rempfer. Numerical study of detailed flow field and performance of Savonius wind turbines, Renewable Energy 51 (2013) 373-381.

DOI: 10.1016/j.renene.2012.09.046