magazinelogo

Journal of Electrical Power & Energy Systems

ISSN Print: 2576-0521 Downloads: 20758 Total View: 271502
Frequency: semi-annually ISSN Online: 2576-053X CODEN: JEPEEG
Email: jepes@hillpublisher.com

Volumes & Issues

Current Issue

Article http://dx.doi.org/10.26855/jepes.2022.02.001

Controlling Flow in Draft Tube of Francis Turbine by Vortex Preventing Element

Deniz Sarper Semerci*, Tahir Yavuz

Department of Mechanical Engineering, Başkent University, Ankara, Turkey.

*Corresponding author: Deniz Sarper Semerci

Published: February 25,2022

Abstract

As importance of renewable energy sources increase with respect to energy demands, turbine efficiencies become more important. Francis turbines are one of the most common turbine types in use at hydroelectric power plants. In some cases such as load rejection and high load operations, pressure fluctuations and vortex formation cause Francis turbine efficiency and endurance to decrease. To prevent these effects, a new component named Vortex Preventing Element (VPE) is designed. The main idea of this new design is damping the swirling slow with Vortex Preventing Element and improving the performance of suction side of runner blades. This new element is mounted between turbine runner and draft tube. CFD analyses are carried out with and without VPE. Preliminary results show that VPE with having only one spiral element provides more uniform flow through the draft tube. According to the preliminary results, the new design also provides an efficiency increment about 4%.

References

[1] Anup, K. C., Young Hoo, L., and Bhola, T. (2016). “CFD study on prediction of vortex shedding in draft tube of Francis turbine and vortex control technique”. Renewable Energy, 86, 2016, 1406-1421.

[2] Choi, Y. D., Kurokawa, J., and Imamura, H. (2007). “Suppression of Cavitation in Inducers by J-Grooves”. Journal of Fluids Engineering, 129, 2007, 15-22.

[3] Wei, Q. S., Choi, Y. D., and Zhu B.S. (2012). “Application of J-Groove to the suppression of swirl flow in the draft tube of a Francis hydro turbine”, 26th IAHR Symposium on Hydraulic Machinery and Systems, 2012.

[4] Chen, Z. and Choi, Y. D. (2018). “Suppression of cavitation in the draft tube of Francis turbine model by J-Groove”. Journal of Mechanical Engineering Science, 2018, 1-11.

[5] Nishi, M., Matsunaga, S., Okamoto, M., Uno, M., and Nishitani, K. (1988). “Measurement of threedimensional periodic flow on a conical draft tube at surging condition”, (eds.) Flows in Non-Rotating Turbomachinery Components FED, 1988, 69, 81-88.

[6] Stuparu, A. and Susan-Resiga, R. “The origin of the plunging pressure fluctuations for a swirling flow with precessing vortex rope in a straight diffuser”, in Proc. of the 6th IAHR Int. Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems (Ljubljana, Slovenia), 1-8.

[7] Muntean, S., Tanasa, C., Bosioc, A. I., and Moş, D. C. (2016). “Investigation of the Plunging Pressure Pulsation in a Swirling Flow with Precessing Vortex Rope in a Straight Diffuser”, 28th IAHR Symposium on Hydraulic Machinery and Systems, 49, 2016, 1-10.

[8] Susan-Resiga, R., Vu, T. C., Muntean, S., Ciocan, G. D., and Nennemann, B. (2006). “Jet Control of the Draft Tube Vortex Rope in Francis Turbines at Partial Discharge,” 23rd IAHR Symposium on Hydraulic Machinery and Systems, Yokohama, Japan, 2006, October 17-21.

[9] Zhang, R. K., Mao, F., Wu, J. Z., Chen, S. Y., Wu, Y. L., and Liu, S. H. “Characteristics and Control of the Draft-Tube Flow in Part-Load Francis Turbine,” ASME J. Fluids Eng., 131(2), p. 021101.

[10] Foroutan, H. and Yavuzkurt, S. “Flow in the Simplified Draft Tube of a Francis Turbine Operating at Partial Load—Part II: Control of the Vortex Rope”, Journal of Applied Mechanics, 81, 061011-1.

[11] Dias, I. and Riethmuller, M. L. (1998). “Visualisation of the Forming Bubble and PIV Measurement of Surrounding Liquid Using Fluorescent Particles,” Proceedings of Eighth International Symposium of Flow Visualisation, Sorrento, Italy, 1998.

[12] Iliescu, M. S., Ciocan, G. D., Avellan, F. “Analysis of the Cavitating Draft Tube Vortex in a Francis Turbine Using Particle Image Velocimetry Measurements in Two-Phase Flow”, Journal of Fluids Engineering, 130, 021102-1.

[13] Siervo, J., Leva, F. (1976). “Modern trends in selecting and designing francis turbines”, Water Power and Dam cont., Aug., 1976, 28-35.

[14] Akin, H., Çelebioğlu, K., and Aradağ, S. (2014). A CFD-Based Design Metodology For Hydraulic Turbines Applied to A Case Study in Turkey, 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Orlando-Floriad-USA, July 2014.

[15] Semerci, D. S. and Yavuz, T. (2016). “Increasing Efficiency of an Exising Francis Turbine by Rehabilitation Process”, The 5th IEEE International Conference on Renewable Energy Research and Applications, Birmingham/UK, 2016.

[16] Semerci, D. S., Yavuz, T. (2018). “Optimization of a Model Francis Turbine Paramaters for the Most Efficient Case”, International Conference on Clean Energy, Famagurta/Cyprus, 2018.

How to cite this paper

Controlling Flow in Draft Tube of Francis Turbine by Vortex Preventing Element

How to cite this paper: Deniz Sarper Semerci, Tahir Yavuz. (2022) Controlling Flow in Draft Tube of Francis Turbine by Vortex Preventing Element. Journal of Electrical Power & Energy Systems6(1), 34-43.

DOI: https://dx.doi.org/10.26855/jepes.2022.02.001