外罩式洋流水力發電機性能提升研究

黎仲仁

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外罩式洋流水力發電機性能提升研究

HYDRODYNAMIC EFFICIENCY ENHANCEMENT OF DIFFUSER AUGMENTED TURBINE

黎仲仁 , Masters　　Advisor：陳世雄　　

英文

洋流發電；擴散增壓渦輪機；計算流體力學；噴嘴附加裝置；性能； Marine current energy ； Diffuser-augmented water turbine ； CFD ； Nozzle add-on ； Performance

Abstract │ Reference (31) │ Altmetrics

Abstract 〈TOP〉

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Nowadays, renewable energy plays a crucial role in building a more sustainable life for the world by cutting back the energy consumption from traditional fossil fuel sources-the main cause of global warming. Beside the conventional kinds of renewable energy such as wind and solar, marine current energy has yet been significantly deployed although it has the greatest potential of energy. One of the recent technology for marine tidal current energy conversion is the utilization and adaptation of the conventional horizontal-axis turbine with the implementation of diffuser-augmented duct. This duct enables the turbine performance be raised a significant percentage. The main purpose of this research is to study the possibility and physics that can further enhance the hydrodynamic performance of the diffuser-augmented tidal turbine with a nozzle add-on device. Hydrodynamic performance assessment and model design is based on computational fluid dynamics (CFD) simulations. A comparison of the potential performance of the original ducted turbine and the modified models with nozzle add-on was also carried out. 
The add-on nozzle is designed to create a converged channel surrounding the duct outlet in order to accelerate the outbound flow and create a pressure drop surrounding the duct outlet. Hence, it creates a larger pressure difference between the inlet and outlet flow of the system. Wider pressure difference will result in a greater mass flow entering the system leading to the improvement in power output. Moreover, the pressure difference also is bigger across the blade surface and generates bigger torque and power output. Parametric study of the design in various configurations, mainly the nozzle length and the nozzle inlet/outlet area ratios, have been conducted to understand the influence of the geometric parameters on the turbine performance. The results confirmed that the overall hydrodynamic efficiency of the diffuser-augmented turbine has been significantly improved. The maximum hydrodynamic efficiency improvement was found to be equal to 28.2% with the nozzle add-on device implemented.

Reference ( 31 ) 〈TOP〉

[1] World Energy Conference, “World Energy Resources,” 2016.
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[3] R. H. Charlier, A ‘sleeper’ awakes: Tidal current power, Renewable and Sustainable Energy Reviews, vol. 7, no. 6, pp. 515–529, 2003.
連結：
[8] S. E. Ben Elghali, M. E. H. Benbouzid, and J. F. Charpentier, Marine Tidal Current Electric Power Generation Technology: State of the Art and Current Status, 2007 IEEE International Electric Machines & Drives Conference, vol. 2, pp. 1407–1412, 2007.
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[14] R. Bontempo and M. Manna, "Performance analysis of open and ducted wind turbines," Applied Energy, vol. 136, pp. 405–416, 2014.
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[17] E. M. Sparrow, J. P. Abraham, and W. J. Minkowycz, "Flow separation in a diverging conical duct: Effect of Reynolds number and divergence angle," International Journal of Heat and Mass Transfer, vol. 52, no. 13–14, pp. 3079–3083, 2009.
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