Numerical investigation on the performance of Wells turbine with non-uniform tip clearance for wave energy conversion |
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| Authors: | Zahari Taha Sugiyono TMYS Tuan Ya Tatsuo Sawada |
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| Institution: | aDepartment of Manufacturing Engineering, University of Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang Kuantan, Pahang, Malaysia;bCentre for Product Design and Manufacturing, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia;cDepartment of Mechanical and Industrial Engineering, Gadjah Mada University, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia;dDepartment of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan |
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| Abstract: | The performance of a Wells turbine with various non-uniform tip clearances was investigated using computational fluid dynamics (CFD). The investigation was performed on numerical models of a NACA0020 blade profile under steady flow conditions. The performance of turbines with uniform and non-uniform tip clearances was compared. The results were also compared with experimental results in literature. It was shown that the performance of turbine with non-uniform tip clearance is similar with that of turbine with uniform one in terms of torque coefficient, input power coefficient, and efficiency. However, the turbine with non-uniform tip clearance seems to have a preferable overall performance. An investigation on the flow-field around the turbine blade was performed in order to explain the phenomena. |
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| Keywords: | Wells turbine NACA0020 blade profile Tip clearance CFD |
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