Abstract
Recently, small hydroelectric generators have gained attention as a further development in water turbine technology for ultra low head drops in open channels. The authors have evaluated the application of cross-flow water turbines in open channels as an undershot type after removing the casings and guide vanes to substantially simplify these water turbines. However, because undershot cross-flow water turbines are designed on the basis of cross-flow water turbine runners used in typical pipelines, it remains unclear whether the number of blades has an effect on the performance or flow fields. Thus, in this research, experiments and numerical analyses are employed to study the performance and flow fields of undershot cross-flow water turbines with varying number of blades. The findings show that the turbine output and torque are lower, the fluctuation is significantly higher, and the turbine efficiency is higher for runners with 8 blades as opposed to those with 24 blades.
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Nicolet C., Zobeiri A., Maruzewski P. and Avellan F., “Experimental Investigations on Upper Part Load Vortex Rope Pressure Fluctuations in Francis Turbine Draft Tube”, International Journal of Fluid Machinery and Systems, Vol. 4, No. 1, 2011, pp. 179–190.
Vu T., Koller M., Gauthier M. and Deschênes C., “Flow Simulation and Efficiency Hill Chart Prediction for a Propeller Turbine”, International Journal of Fluid Machinery and Systems, Vol. 4, No. 2, 2011, pp. 243–254.
Yang C., Zheng Y. and Li L., “Optimization Design and Performance Analysis of a Pit Turbine with Ultralow Head”, Advances in Mechanical Engineering, Vol. 2014, Article ID 401093, 2014, pp. 1–7.
Reynolds T. S., “Stronger Than A Hundred Men: A History of the Vertical Water Wheel”, The Johns Hopkins University Press, 1983.
Fujiwara Y., Kado H. and Hosokawa Y., “History and Performance of Traditional Water Wheel in Western Europe”, Transactions of the Japan Society of Mechanical Engineers (in Japanese), Vol. 90, No. 819, 1987, pp. 212–218.
Furukawa A., Watanabe S., Matsushita D. and Okuma K., “Development of Ducted Darrieus Turbine for Low Head Hydropower Utilization”, Current Applied Physics, Vol. 10, 2010, pp. 128–132.
Mockmore C. A. and Merryfield F., “The Banki Water Turbine,” Bulletin Series, Vol. 25, 1949.
Fukutomi J., “Characteristics and Internal Flow of Cross-Flow Turbine for Micro Hydro Power,” Turbomachinery (in Japanese), Vol. 28, No. 3, 2000, pp. 156–163.
Nishi Y., Inagaki T., Omiya R., Tachikawa T., Kotera M. and Fukutomi J., “Study on a Cross-Flow Water Turbine Installed in an Open Channel,” Turbomachinery (in Japanese), Vol. 39, No. 8, 2011, pp. 467–474.
Nishi Y., Inagaki T., Li, Y., Omiya R. and Fukutomi J., “Study on an Undershot Cross-Flow Water Turbine”, Journal of Thermal Science, Vol. 23, No. 3, 2014, pp. 239–245.
Nishi Y., Inagaki T., Omiya R. and Fukutomi J., “Performance and Internal Flow of an Undershot-Type Cross-Flow Water Turbine”, Transactions of the Japan Society of Mechanical Engineers, Series B (in Japanese), Vol. 79, No. 800, 2013, pp. 521–532.
Nishi Y., Inagaki T., Li, Y., Omiya R. and Hatano K., “The Flow Field of Undershot Cross-Flow Water Turbines Based on PIV Measurements and Numerical Analysis”, International Journal of Fluid Machinery and Systems, Vol. 7, No. 4, 2014, pp. 174–182.
Nishi Y., Inagaki T., Li, Y. and Hatano K., “Study on an Undershot Cross-Flow Water Turbine with Straight Blades”, International Journal of Rotating Machinery, Vol. 2015, Article ID 817926, 2015, pp. 1–10.
ANSYS, Inc., “ANSYS CFX-Solver Theoretical guide”, 2010, pp. 137–139.
ANSYS, Inc., “ANSYS CFX-Solver Modeling guide”, 2010, pp. 144–145.
Fukutomi J., Nakase Y. and Hasui S., “A Study of a Cross-Flow Turbine (Effects of the Blade Number and Blade Exit Angle on the Turbine Performance)”, Transactions of the Japan Society of Mechanical Engineers, Series B (in Japanese), Vol. 52, No. 473, 1986, pp. 407–412.
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Nishi, Y., Hatano, K. & Inagaki, T. Study on performance and flow field of an undershot cross-flow water turbine comprising different number of blades. J. Therm. Sci. 26, 413–420 (2017). https://doi.org/10.1007/s11630-017-0956-1
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DOI: https://doi.org/10.1007/s11630-017-0956-1