Guide Vane with Current Plate to Improve Efficiency of Cross Flow Turbine

Kiyoshi Kokubu, Toshiaki Kanemoto, Keisuke Yamasaki

Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu, Japan.
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu, Japan.

DOI: 10.4236/ojfd.2013.32A005                

Abstract

To get the sustainable society, the hydropower with not only the large but also the small/mini/micro capacities has been paid attention to in the power generation. The cross flow turbine can work effectively at the comparatively low head and/or low discharge, then the runner and the turbine profile has been optimizing. In this paper, the model turbine was prepared in accordance with the traditional design, and the performance and the flow condition were investigated experimentally at the various operating conditions. The hydraulic efficiency is doubtlessly maximal while the guide vane is at the normal/design position, and deteriorates in the lower discharges adjusted by the guide vane. Such deteriorations are brought from the unacceptable flow conditions in the inlet nozzle. To improve the efficiency dramatically in the lower discharge, the guide vane installed in the inlet nozzle was equipped with the current plate, and the fruitful effects of the plate on the efficiency were confirmed experimentally.

Keywords

Hydraulic Turbine; Cross Flow Turbine; Guide Vane; Inlet Nozzle; Hydraulic Efficiency; Discharge

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	H. Kobayashi, “Small Capacity Hydropower,” Water Culture, No. 39, 2011, p. 4. (in Japanese)
[2]	L. Cho, K. Kurokawa, J. Matsui and H. Imamura, “Application of Low Head Cross Flow Turbine to Micro Capacity Hydropower (Simplified Structure and Improved Performances),” JSME Series B, Vol. 67, No. 664, 2001, pp. 222-227. (in Japanese)
[3]	T. Toyokura, T. Kanemoto, T. Kitahora and A. Shiraisi, “Researches of Cross Flow Turbine,” JSME Series B, Vol. 51, No. 461, 1985, pp. 143-151. (in Japanese) doi:10.1299/kikaib.51.143
[4]	T. Kitahora, M. Inagaki, M. Uchida and S. Ooike, “Influence of Pressure in Runner Chamber on Performance Estimation of Micro-Head Cross Flow Hydraulic Turbine,” Proceedings of Renewable Energy 2010, Yokohama, 31 May-2 June 2010, CD-ROM: O-Sh-4-5.
[5]	Turbomachinery Society of Japan, “Hydro Turbine,” Japan Industrial Publishing Co. Ltd., Tokyo, 1992, pp. 65-67. (in Japanese)
[6]	S. Croquer, M. Asuaje, J. de Andrade, F. Jeanty and J. Clarembaux, “Use of CFD Tools in Internal Deflector Design for Cross Flow Turbine Efficiency Improvement,” Proceedings of ASME 2012 Fluids Engineering Summer Meeting, Rio Grande, 10 July 2012, CD-ROM: FEDSM 2012-72017.
[7]	H. Olgun, “Effect of Interior Guide in Cross Flow Turbine Runner on Turbine Performance,” International Journal of Energy Researches, Vol. 24, No. 11, 2000, pp. 953-964. doi:10.1002/1099-114X(200009)24:11<953::AID-ER634>3.0.CO;2-3
[8]	T. Toyokura and T. Kanemoto, “Cross Flow Turbine,” Energy and Resource, Vol. 4, No. 3 1983, pp. 234-239. (in Japanese)
[9]	Turbomachinery Society of Japan, “Hydro Turbine,” Japan Industrial Publishing Co. Ltd., Tokyo, 1992, p. 78. (in Japanese)
[10]	Turbomachinery Society of Japan, “Hydro Turbine,” Japan Industrial Publishing Co. Ltd., Tokyo, 1992, p. 64. (in Japanese)
[11]	K. Kokubu, K. Yamasaki, H. Hond and T. Kanemoto, “Effect of Inner Guide on Performances of Cross Flow Turbine,” Proceedings of 26th IAHR Symposium on Hydraulic Machinery and System, Beijing, 19-23 August 2012, CD-ROM: IAHRXXVI-198.
[12]	K. Kokubu, T. Kanemoto, S. Son and Y. Choi, “Performance Improvement of a Micro Eco Cross-Flow Hydro Turbine,” Journal of the Korean Society of Marine Engineering, Vol. 36, No. 7, 2012, pp. 902-909. doi:10.5916/jkosme.2012.36.7.902