Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 6 2 2016 06 21 Experimental and numerical investigation of blade shape effect on the Hunter wind turbines efficiency Experimental and numerical investigation of blade shape effect on the Hunter wind turbines efficiency 329 339 778 10.22044/jsfm.2016.778 FA M. Nakhaee P. Ghorbanianfard M. Kahrom M. Ayani Journal Article 2015 06 17 In the present study, the blade shape of a new kind of VAWT that has a different structure in comparison with other drag-based wind turbines, hunter turbine, is investigated and then optimized. The purpose of this study is designing a blade with the greatest drag coefficient in order to increase the power coefficient of the turbine. In this study 4 kinds of flat blades, including squared, circular, semi-circular and compound flat plates, have been investigated in static state experimentally and numerically. The numerically simulation has been carried out by assuming the in compressible, unsteady two-dimensional and steady three-dimensional flow. Flow simulation has been accomplished by discretizing and solving the Navier-Stokes equations with shear-stress transport (SST) k-ω turbulence model. This model simulates the near-wall flow by directly solving Navier-Stokes equations. In experimental method, the drag force is measured by a load-cell and the drag coefficient has been calculated by using the blade area. The results show a great agreement between the experimental and numerical data. It is concluded that the squared blade has the greatest drag coefficient among the considered cases, which is 1.18. In the present study, the blade shape of a new kind of VAWT that has a different structure in comparison with other drag-based wind turbines, hunter turbine, is investigated and then optimized. The purpose of this study is designing a blade with the greatest drag coefficient in order to increase the power coefficient of the turbine. In this study 4 kinds of flat blades, including squared, circular, semi-circular and compound flat plates, have been investigated in static state experimentally and numerically. The numerically simulation has been carried out by assuming the in compressible, unsteady two-dimensional and steady three-dimensional flow. Flow simulation has been accomplished by discretizing and solving the Navier-Stokes equations with shear-stress transport (SST) k-ω turbulence model. This model simulates the near-wall flow by directly solving Navier-Stokes equations. In experimental method, the drag force is measured by a load-cell and the drag coefficient has been calculated by using the blade area. The results show a great agreement between the experimental and numerical data. It is concluded that the squared blade has the greatest drag coefficient among the considered cases, which is 1.18. https://jsfm.shahroodut.ac.ir/article_778_6e2b14897a17971d646fcf45ef1e48be.pdf