Development of Optimization Algorithm for Low Speed UAVs Propellers

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Miraghaei Jafari, Zahra Sadat | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45632 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Mazaheri, Karim
Abstract:
Aerodynamic shape optimization has been always of great importance in aerospace design. Recent advancements in computational algorithms and hardware, has made it feasible to have advanced optimization as a standard part of desing procedure. Here we have promoted aerodynamic optimization of air propeller.
Propeller optimization process requires a propeller performance analysis program and an efficient optimization algorithm. A vortex lattice model is used for the propeller performance analysis and a computer program is developed based on it. Experiment and litritures are used for validation of VLM code. In order to optimize the propeller peformance, propeller efficiency is applied as cost function and blade twist angle is the optimization variable. Propeller efficiency is optimized using gradiant-based algorithm. This procedure is apply to two 2-blade propellers, G/F and Super Nylon. As optimization result, propeller efficiency is increased about 4 and 7 percent.
Keywords:
Optimization ; Unsteady Vortex Lattic Method ; Unsteady Flow ; Air Propeller ; Gradient Based Method