Abstract

This study demonstrates the overall performance and efficiency of a 300 Watt conventional vertical axis wind turbine manufactured by (i-wind) for a low wind speed regions. The study investigates the increasing of blade tangential velocity by adding a new blade attached to the main blade of the turbine. The new blades called secondary blades which will take the effect of increasing the tangential velocity and hence increasing the rated output power. The new contribution proposed in this study was taken into considerations the optimum position of the secondary blades. The position was taken to be in parallel location with the main blades under different configurations and distances (7, 10, 15 and 20 cm). A simulation analysis using ANSYS CFD was proposed in this study to evaluate the tangential velocity and the rotational speed of different cases for the modified vertical axis wind turbine. The range of wind velocities were 5 to 12 m/s in order to cover a reasonable range of wind speed. The variation of power and rotational speed was compared with the power and rotational speed calculated for the conventional wind turbine. The study illustrates the correlations of power and rotational speed of the modified vertical axis wind turbine. The increasing of tangential velocity and output power for the modified turbine under a minimum wind speed of 5 m/s were found to be 17% and 51% respectively.

Keywords:

Secondary blade, simulation, vertical axis wind turbine, wind energy, wind turbine,

References

1. Badawy, M.T.S. and M.E. Aly, 2000. Gas dynamic analysis of the performance of diffuser augmented wind turbine. Sadhana, 25(5): 453-461.
   CrossRef    
2. Balduzzi, F., A. Bianchini, R. Maleci, G. Ferrara and L. Ferrari, 2016. Critical issues in the CFD simulation of Darrieus wind turbines. Renew. Energy, 85: 419-435.
   CrossRef    
3. Basak, S.K., 2012. Numerical analysis of flow field for small scale helical twisted vertical axis wind turbine (VAWT). M.S.E. Thesis, Purdue University.
   Direct Link
4. Castillo, J., 2011. Small-scale vertical axis wind turbine design. B.Sc. Thesis, Tampere University of Applied Science.
   Direct Link
5. Eboibi, O., 2013. The influence of blade chord on the aerodynamics and performance of vertical axis wind turbines. Ph.D. Thesis, Mechanical Engineering Department, The University of Sheffield, pp: 1-258.
   Direct Link
6. Lee, J.H., Y.T. Lee and H.C. Lim, 2016. Effect of twist angle on the performance of Savonius wind turbine. Renew. Energy, 89: 231-244.
   CrossRef    
7. Malael, I., H. Dumitrescu and V. Cardos, 2014. Numerical simulation of vertical axis wind turbine at low speed ratios. Global J. Res. Eng. 1 Numer. Method., 14(1).
   Direct Link
8. Qasim, A.Y., R. Usubamatov and Z.M. Zain, 2011. Analysis of impeller type wind turbine. IIUM Eng. J., 12(3): 93-100.
   Direct Link
9. Ragheb, M. and A.M. Ragheb, 2011. Wind turbines theory - the betz equation and optimal rotor tip speed ratio. Fund. Adv. Topic. Wind Power, 1(1).
   Direct Link
10. Salih, S.A., S. Mat, K. Sopian, E. Saleh and M. Alkhair, 2015. Simulation analysis of venturi-vertical axis wind turbine (V-VAWT). Proceeding of the 8th International Conference on Renewable Energy Sources (RES'14), Kuala Lumpur, 25: 191-196.
    PMid:26596971    
11. Shahizare, B., N. Nik-Ghazali, W.T. Chong, S. Tabatabaeikia, N. Izadyar and A. Esmaeilzadeh, 2016. Novel investigation of the different Omni-direction-guide-vane angles effects on the urban vertical axis wind turbine output power via three-dimensional numerical simulation. Energ. Convers. Manage., 117: 206-217.
    CrossRef    
12. Tummala, A., R.K. Velamati, D.K. Sinha, V. Indraja and V.H. Krishna, 2016. A review on small scale wind turbines. Renew. Sustain. Energ. Rev., 56: 1351-1371.
    CrossRef    
13. Vassberg, J., A. Gopinath and A. Jameson, 2005. Revisiting the vertical-axis wind-turbine design using advanced computational fluid dynamics. Proceeding of 43rd AIAA Aerospace Sciences Meeting and Exhibit, (AIAA-2005-0047).
    CrossRef    

Competing interests

The authors have no competing interests.

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