Optimization of Tri–Rotor Propeller for Maximum Lift Efficiency

This paper presents the simulation of a tri-rotor contra-rotating propeller for the thrust and lift efficiency during vertical take-off. In fact, the second rotor worked in the opposite direction in respect to the first and the third rotors. Our multi-rotor system includes three rotors with two blades for each rotor. For this study, NACA 0012 untwisted and symmetric airfoil was chosen. The airflow analysis experimented with CFD (Computational Fluid Dynamics) simulation. Therefore, the optimization of the tri-rotor propeller was performed with different pitch combinations to achieve adequate lift efficiency with sufficient overall thrust value. Critical angle of attack for the chosen airfoil gave the boundary conditions for the pitch of rotors. The results of simulations showed us the most efficient combinations for three rotors work better with increasing pitch angle from top to bottom.