كاظم يزديان ورجاني

The wing can be considered the most important part of an aircraft because flight is not possible without it. The wing is very important in terms of lift force generation and aerodynamic considerations in unmanned aerial vehicles. Today, Uavs occupy a major part of the world's aerospace industry. L/D is very important in aerial vehicle that require high durability and range. A higher lift-to-drag ratio gives a higher aerodynamic efficiency to the uav. Winglets weaken wing tip vortex and this device is used to reduce drag and improve aerodynamic performance of aircraft. Overall improvement of aerodynamic efficiency reduces fuel consumption. In this research, the simulation and optimization of the winglet of has been studied. the main geometry has been investigated and eva‎luated using the numerical solution at the AOA= 0 with the aim of maximizing the lift-to-drag ratio through the design of experiment and the response surface method The speed was 150 km/h and the angle of attack was 0 degrees. The results show that the aerodynamic performance (lift-to-drag ratio) of the optimized geometry has increased by 17.66% at AOA=0 . Using the optimal winglet in AOA of -4 to 20 degrees, a numerical solution was also performed, which shows improvement aerodynamic performance. Investigations showed that the numerical simulation results agree with the reference data with an acceptable value. The results for the case without a winglet indicate a vortex structure at the wing tip which is due to the pressure distribution on the upper and lower surfaces of the wing. The wingtip and winglet vortex become larger with increasing angle of attack, and the optimization by winglet weakens the vortex.

بهينه سازي , تحليل عددي , آيروديناميك , بالك

Optimization , Numerical Analysis , Aerodynamics , winglet

Kazem yazdiyan verjani

Dr. hosseinalipour