Performance improvement of hybrid Darrieus-Savonius wind turbine

Authors

faculty of engineering, ferdowsi university on mashhad

Abstract

Vertical axis wind turbine, divided into Darrieus and Savonius, have been considered by many scientists owing to simplicity of design and operation independent of wind direction. Although Darrieus turbine has higher efficiency than Savonius, it faces to essential problem of self-starting. The aim of the present study is the combination of Darrieus and Savonius turbine in order to reach to a model with high starting torque and proper performance range. First, a model involving 3 straight-bladed Darrieus with 2 Savonius blades is simulated. For improving the performance, Savonius blade arc angle and airfoil solidity are changed. By optimizing the arc angle and solidity, the initial hybrid model performance is improved. Two-dimensional simulation using computational fluid dynamics is conducted using moving mesh for rotating part. According to results, the combination of Darrieus and Savonius turbine has favorable impact on self starting and makes performance curve smooth. It was also observed that solidity of 0.75 for Darrieus and angle of 150° for savonius blade arc are the optimized mode for maximum power coefficient, starting torque and performance range. In other words, The hybrid model with maximum performance is achieved by using these values at the same time.

Keywords

Main Subjects

References

[1] Tummala A, Velamati RK, Sinha DK, Indraja V, Krishna VH (2016) A review on small scale wind turbines. Renew Sustainable Energy Rev 56: 1351-1371.
[2] Leung DYC, Yang Y (2012) Wind energy development and its environmental impact: A review. Renew Sustainable Energy Rev 16: 1031-1039.
[3] Mahale P, Jangid N, Gite A (2015) Vertical axis wind turbine: A lucid solution for global small scale energy crisis. J Academia Ind Res 3(8): 393-396.
[4] Islam M, Ting DSK, Fartaj A (2008) Aerodynamic models for Darrieus-type straight-bladed vertical axis wind turbines. Renew Sustainable Energy Rev 12: 1087-1109.
[5] Bos R (2012) Self-starting of a small urban Darrieus rotor. Delft University of Technology.
[6] Saha UK, Rajkuma MJ (2006) On the performance analysis of Savonius rotor with twisted blades. Renew Energy 31(11): 1776-1788.
[7] Amiri M, Kahrom M, Kianifar A (2015) Numerical and experimental investigation on effects of the primary and Secondary overlaps on the performance of Savonius wind turbine. Modares Mech Eng 15(6): 123-131.
[8] Ghosh P, Kamoji MA, Kedare SB, Prabhu SV (2009) Model testing of single- and threestage modified Savonius rotors and viability study of modified Savonius pump rotor systems. Int J Green Energy 6(1): 22-41.
[9] Takao M, Kuma H, Maeda T, Kamada Y, Oki M, Minoda M (2009) A straight-bladed vertical axis wind turbine with a directed guide vane row-Effect of guide vane geometry on the performance. J thermal Sci 18(1): 54-57.
[10] McLaren K, Tullis S, Ziada S (2012) Measurement of high solidity vertical axis wind turbine aerodynamic loads under high vibration response conditions. J Fluid Struct 32: 12-26.
[11] Miau JJ, Liang SY, Yu RM, Hu CC, Leu TS, Cheng JC, Chen SJ (2012) Vertical-axis wind turbine with pitch control. App Mech Materials 225: 338-343.
[12] Beri H, Yao Y (2011) Effect of Camber Airfoil on Self Starting of Vertical Axis Wind Turbine. J Environ Sci Technol 4(3): 302-312.
[13] Mohamed MH (2013) Impacts of solidity and hybrid system in small wind turbines performance. Int J Energy 57: 495-504.
[14] Gupta R, Das R, Sharma K (2006) Experimental study of a Savonius-Darrieus wind machine. Proceedings of the International Conference on Renewable Energy for Developing Countries, University of Columbia, Washington DC.
[15] Gupta R, Biswas A, Sharma KK (2008) Comparativ study of three-bucket Savonius turbine with combined three-bucket-Savonius-three-bladed-Darrieus turbine. Int J Renew Energy 33: 1974-1981.
[16] Bhuyan S, Biswas A (2014) Investigations on self-starting and performance characteristics of simple H and hybrid H-Savonius vertical axis wind rotors. Energ Convers Manage 87: 859-867.
[17] Narasimhamurthy VD (2004)Unsteady-RANS simulation of turbulent trailing-edge flow. Chalmers University of Technology, Goteborg.
[18] Rogowski K, Maronski R (2015) CFD computation of the savonius rotor. J Theor appl mech 53(1): 37-45.
[19] Jones WP, Launder BE (1972) The Prediction of laminarization with atwo- equation model of turbulence. J Heat mass transfer 15: 301-314.
[20] Wilcox DC (1998) Turbulence modeling for CFD. 2nd edn. DCW Industries, California 174-180.
[21] Menter FR (1994) Two-equation eddy-viscosity turbulence models for engineering applications. AIAA J 32(8): 1598-1605.
[22] Lanzafame R, Mauro S, Messina M (2014) 2D CFD modeling of H-Darrieus wind turbines using       a transition turbulence model. J Energy Procedia 45: 131-140.
[23] Castelli M, Englaro A, Benini E (2011) 2D CFD modeling of H-Darrieus wind turbines using a transition turbulence model. J Energy 36: 4919-4934.
[24] Blackwell BF, Sheldahl RE, Feltz LV (1977) Wind tunnel performance data for two-and three-bucket Savonius rotors. Sandia Laboratories, Albuquerque, NM.
[25] Howell R, Qin N, Edwards J, Durrani N (2010) Wind tunnel and numerical study of a small vertical axis wind turbine. Renew energy 35(2): 412-422.
Journal of Solid and Fluid Mechanics
Volume 6, Issue 3
September and October 2016
Pages 195-212

Files

Share

How to cite

Statistics