Numerical Study of the Effect of Three Different Types of Winglets onAerodynamic Performance Flow in With Low Reynolds Number

In this study, the effectiveness of three types of winglets such as Blended , Multi-tip, and Raked on a specific wing,is investigated by using a numerical method based on finite volume and pressure-based algorithms. In thisnumerical method, the Spalart-Allmaras turbulence model is used. In this simulation Reynolds number is 1.5×105and SD7032 airfoil is used for wing section by 4.6 aspect ratio. The stresses on the wing surface are calculated bythe wall functions, and the convective fluxes are computed by the second-order upwind accuracy. In this research,the specific airfoil is used for wing and winglet and the effectiveness on the aerodynamic performance of arectangular wing has been investigated. Evaluation of aerodynamic coefficients and flow physics have shown thatusing the same airfoil for wing and winglet with different angles of attack, It has increased the performance of theMulti-tip winglet by 3.1 percent compared to the case of using two airfoil and also for Blended and Multi-tipwinglets compared to the wing without winglet will increase an average aerodynamic performance by 10.5 and 10percent. But for Raked winglet, it has only a small effect on reducing the power of the vortex core.