CFD analysis of performance improvement of the Savonius water turbine by using an impinging jet duct design

doi:10.1016/j.cjche.2018.11.014

Abstract

Abstract: The majority of research on water turbines focuses on design improvement of large-scale hydrokinetic turbines for power generation, which may have delayed the utilization of kinetic energy contained in rivers and canals. The aim of this paper is to improve the efficiency of a two bladed Savonius type cross-flow hydrokinetic turbine, which can be used as an energy converter to harness free-stream kinetic energy of water. An impinging jet duct design is presented for improving performance of the Savonius turbine in wind application as seen from literature. The performance of the modified turbine is evaluated using CFD software Fluent, and is compared with that of a simple two bladed Savonius water turbine and some of the prominent literature designs of the Savonius turbine. It is shown that the present design exhibits improved performance compared to the selected designs of the Savonius turbine. Further an insight of the improved performance of the modified turbine is also obtained from flow physics study.

Key words: Savonius water turbine, CFD, Impinging jet duct design, Power coefficient, Water power, Flow physics

摘要： The majority of research on water turbines focuses on design improvement of large-scale hydrokinetic turbines for power generation, which may have delayed the utilization of kinetic energy contained in rivers and canals. The aim of this paper is to improve the efficiency of a two bladed Savonius type cross-flow hydrokinetic turbine, which can be used as an energy converter to harness free-stream kinetic energy of water. An impinging jet duct design is presented for improving performance of the Savonius turbine in wind application as seen from literature. The performance of the modified turbine is evaluated using CFD software Fluent, and is compared with that of a simple two bladed Savonius water turbine and some of the prominent literature designs of the Savonius turbine. It is shown that the present design exhibits improved performance compared to the selected designs of the Savonius turbine. Further an insight of the improved performance of the modified turbine is also obtained from flow physics study.

关键词: Savonius water turbine, CFD, Impinging jet duct design, Power coefficient, Water power, Flow physics

Narendra Thakur, Agnimitra Biswas, Yogesh Kumar, Mithinga Basumatary. CFD analysis of performance improvement of the Savonius water turbine by using an impinging jet duct design[J]. Chinese Journal of Chemical Engineering, 2019, 27(4): 794-801.

References

[1] N.K. Sarma, A. Biswas, R.D. Misra, Experimental and computational evaluation of Savonius hydrokinetic turbine for low velocity condition with comparison to Savonius wind turbine at the same input power, Energy Convers. Manag. 83(2014) 88-98.
[2] I. Mabrouki, Z. Driss, M.S. Abid, Experimental investigation of the height effect of water Savonius rotors, Int. J. Mech. Appl. 4(1) (2014) 8-12.
[3] N.I. Khan, M.T. Iqbal, M. Hinchey, V. Masek, Performance of Savonius rotor as a water current turbine, Marit. Port Secur. 4(2) (2009) 71-83.
[4] N. Rosmin, A. Safwan Jauhari, A.H. Mustaamal, F. Husin, M.Y. Hassan, Experimental study for the single stage and double-stage two-bladed savonius micro-sized turbine for rain water harvesting (RWH) system, Energy Procedia 68(2015) 274-281.
[5] C.R. Patel, V.K. Patel, S.V. Prabhu, T.I. Eldho, Investigation of overlap ratio for Savonius type vertical axis hydro turbine, Int. J. Soft Comput. Eng. 211(2013) 2231-2307.
[6] A. Damak, Z. Driss, M.S. Abid, Experimental investigation of helical Savonius rotor with a twist of 180°, Renew. Energy 52(2013) 136-142.
[7] A.H. Elbatran, Y.M. Ahmed, A.S. Shehata, Performance study of ducted nozzle Savonius water turbine, comparison with conventional Savonius turbine, Energy 134(2017) 566-584.
[8] K. Golecha, T.I. Eldho, S.V. Prabhu, Influence of the deflector plate on the performance of modified water turbine, Appl. Energy 88(2011) 3207-3217.
[9] M. Basumatary, A. Biswas, Numerical simulation of two-bladed Savonius water turbine with deflector, Int. J. Renew. Energy Technol. 7(4) (2016) 383-402.
[10] M.I. Hassan, N. Khan, M. Hinchey, T. Iqbal, V. Masek, Study of a Twisted Savonius Water Current Turbine, PhD Thesis, Memorial University of Newfoundland, St. John's, NL AIB 3X5, Canada, 2009.
[11] A.E. Hassanzadeh, O. Yakoob, M. Ahmed, M. Ismail, Comparison of conventional and helical Savonius marine current turbine using computational fluid dynamics, World Appl. Sci. J. 28(8) (2013) 1113-1119.
[12] A. Kumar, R.P. Saini, Performance analysis of a Savonius hydrokinetic turbine having twisted blades, Renew. Energy 108(2017) 502-522.
[13] A. Kumar, R.P. Saini, Performance analysis of a single stage modified Savonius hydrokinetic turbine having twisted blades, Renew. Energy 113(2017) 461-478.
[14] W.A. El-Askary, M.H. Nasef, A.A. Hamid, H.E. Gad, Harvesting wind energy for improving performance of Savonius rotor, Wind Eng. Ind. Aerodyn. 139(2015) 8-15.
[15] M.-H. Yang, G.-M. Huang, R.-H. Yeh, Performance investigation of an innovative vertical axis turbine consisting of deflectable blades, Appl. Energy 179(2016) 875-887.
[16] A. Rezaeiha, I. Kalkman, B. Blocken, Effect of pitch angle on power performance and aerodynamics of a vertical axis wind turbine, Appl. Energy 197(2017) 132-150.
[17] M.H. Naseef, W.A. Ei-Askary, A.A. Hamid, H.E. Gad, Evaluation of Savonius rotor performance:Static and dynamic studies, J. Wind Eng. Ind. Aerodyn. 23(2013) 1-11.
[18] G. Kailash, T.I. Eldho, S.V. Prabhu, Performance study of modified Savonius water turbine with two deflector plates, Int. J. Rotating Mach. 2012(2012), 679247. https://doi.org/10.1155/2012/679247.
[19] F. Nobuyuki, On the torque mechanism of Savonius rotors, J. Wind Eng. Ind. Aerodyn. 40(3) (1992) 277-292.