ﺷﺒﯿﻪ ﺳﺎزي ﺳﻪ ﺑﻌﺪي ﺗﻮرﺑﯿﻦ ﮐﺮوي ﻟﻮﺳﯿﺪ و ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮ ﭘﺎراﻣﺘﺮﻫﺎي ﻣﺨﺘﻠﻒ ﭘﺮه ﻫﺎ ﺑﺮ ﻋﻤﻠﮑﺮد آن

Numerical Simulation of Lucid Spherical Turbine and Investigation of the Effect of Different Parameters of Blades on Its Performance

در ﭘﮋوﻫﺶ ﺣﺎﺿﺮ ﺗﺤﻘﯿﻖ ﺑﺮ روي ﺗﻮرﺑﯿﻦ ﮐﺮوي ﻟﻮﺳﯿﺪ از دﺳﺘﻪ ﺗﻮرﺑﯿﻦ ﻫﺎي ﺟﺮﯾﺎن ﻣﺘﻘﺎﻃﻊ اﻧﺠﺎم ﺷﺪه اﺳﺖ. از ﺷﺒﯿﻪ ﺳﺎزي ﺳﻪ ﺑﻌﺪي ﭘﺎﯾﺎ ﺟﻬﺖ ارزﯾﺎﺑﯽ ﻗﺪرت ﺧﺮوﺟﯽ و ﻋﻤﻠﮑﺮد اﯾﻦ ﻧﻮع ﺗﻮرﺑﯿﻦ در ﯾﮏ ﮐﺎﻧﺎل ﺑﺎ ﺳﺮﻋﺖ ﺟﺮﯾﺎن ﮐﻢ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. از ﻣﺪل آﺷﻔﺘﮕﯽ k-ω SST ﺟﻬﺖ ﺟﺮﯾﺎن آﺷﻔﺘﻪ اﻃﺮاف ﺗﻮرﺑﯿﻦ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. از ﻧﺘﺎﯾﺞ ﺗﺠﺮﺑﯽ ﺑﺎﭼﺎﻧﺖ و وزﻧﯿﮏ ﮔﺰارش ﺷﺪه ﺑﺮاي ﺗﻮرﺑﯿﻦ ﮐﺮوي ﻟﻮﺳﯿﺪ، ﺑﺮاي ﺗﺎﯾﯿﺪ ﺻﺤﺖ ﺷﺒﯿﻪﺳﺎزيﻫﺎ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. اﺛﺮ ﺳﻪ ﭘﺎراﻣﺘﺮ ﻣﻮﺛﺮ ﺑﺮ ﻋﻤﻠﮑﺮد ﺗﻮرﺑﯿﻦ ﺷﺎﻣﻞ ﺗﻌﺪاد، ﻃﻮل وﺗﺮ و ﻧﻮع ﻣﻘﻄﻊ ﭘﺮه ﻫﺎ در داﻣﻨﻪاي از ﻧﺴﺒﺖ ﺳﺮﻋﺖ ﻫﺎي ﻧﻮك ﭘﺮه ﻣﻮرد ارزﯾﺎﺑﯽ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. ﺑﺮرﺳﯽ ﻧﺘﺎﯾﺞ ﺑﺪﺳﺖ آﻣﺪه ﻧﺸﺎن ﻣﯽ دﻫﺪ ﮐﻪ اﻓﺰاﯾﺶ ﻃﻮل وﺗﺮ ﭘﺮه در ﻧﺴﺒﺖﺳﺮﻋﺖ ﻫﺎي ﮐﻤﺘﺮ ﺑﺎﻋﺚ اﻓﺰاﯾﺶ 15 درﺻﺪي ﺿﺮﯾﺐ ﺗﻮان ﺗﻮرﺑﯿﻦ ﻧﺴﺒﺖ ﺑﻪ ﻧﻮع اﺻﻠﯽ آن ﻣﯽ ﺷﻮد؛ ﻫﻤﭽﻨﯿﻦ در ﺗﻮرﺑﯿﻦ ﺑﺎ ﺳﻪ ﭘﺮه ﺑﻬﺘﺮﯾﻦ ﻧﺘﺎﯾﺞ ﺑﻪ دﺳﺖ آﻣﺪ ﮐﻪ ﻣﻨﺠﺮﺑﻪ اﻓﺰاﯾﺶ ﺿﺮﯾﺐ ﺗﻮان ﺑﻪ اﻧﺪازه 12/5 درﺻﺪ ﺷﺪه اﺳﺖ. ﻧﻬﺎﯾﺘﺎ ﺑﺪﺳﺖ آﻣﺪ ﮐﻪ اﺳﺘﻔﺎده از اﯾﺮﻓﻮﯾﻞ ﻫﺎي ﻧﺎﻣﺘﻘﺎرن ﺗﺎﺛﯿﺮ ﻣﺜﺒﺘﯽ روي ﻋﻤﻠﮑﺮد ﺗﻮرﺑﯿﻦ دارد.

In this paper the research has been performed on the cross-axis flow Lucid spherical turbine. Three-dimensional steady numerical simulation is used to determine power output and performance of this kind of turbines for low velocities in a channel. The k-ω SST turbulence model is used to perform the turbulent steady flows around the turbine. Further, Bachant and Wosnik's experimental data reported for spherical Lucid turbine, is employed to confirm the simulations. The influence of three effective parameters of blades, including the chord length, the number of blades and the type of airfoil section on the turbine performance are investigated over a range of tip-speed-ratios. It was found that increasing the blade chord length in lower speed tip ratios cause to increase the power coefficient up to %15 compared to the original version. Also, for the turbine with three blades, the best results were obtained by which, the power coefficient increased by 12.5%. Finally, it is obtained that using asymmetric airfoil section for blades has a positive effect on the turbine performance.