Ahmad Sedaghat - Department of Mechanical Engineering, Isfahan University of Technology, Isfahan ۸۴۱۵۶-۸۳۱۱۱, Iran

design of HAWT is introduced here.Aerodynamic design of horizontal axis wind turbines is presently obtained using the combined momentum and blade element theory(BEM). Further improvements were achieved by incorporating wake rotation, tip losses, and some off-design amendments. In all of these, noclosed analytical solutions exist, drag coefficient is always taken to be zero when calculating axial and angular induction factors,and some cumbersome iterative numerical methods are employed to obtain wind turbine parameters. The iterative methods usuallyexhibit poor convergence and also sometimeslead to non-unique multiple solutions. In our new analytical approach, the mentioned theories are advanced into a new level of closedform unique solution in which all the effects of drag coefficient, wake rotation, and tip losses are incorporated for the design of newgeneration of HAWT. It is observed from this study that the classical optimum Glauert type wind turbines are not necessarily the best initialdesign; because some modification to the near root of HAWT blades introduced in our modelling can substantially enhancecharacteristics and performance of HAWTs particularly at high wind speeds

Wind turbine, Aerodynamics design, Blade element momentum theory