Multi-objective optimization of propeller airfoil for general aviation aircraft
In order to obtain an airfoil with higher aerodynamic performance and lower aerodynamic noise,the RAF-6 airfoil for a general aviation aircraft propeller was optimized.The flow field and sound field of the airfoil were simulated by CFD/FW-H(Ffowcs Williams-Hawkings)method.The influence laws of four design variables,i.e.the maximum thickness,the position of the maximum thickness,the downbending angle and position of trailing edge,on its aerodynamic performance and aerodynamic noise were studied respectively.Taking the cruise state as the design point,the airfoil multi-objective optimization design was carried out with higher lift-drag ratio and lower aerodynamic noise as the optimization objectives,and the Pareto solution set was obtained.The experimental results verified that the optimized airfoil increased the propeller thrust by 14.7％and reduced the aerodynamic noise by 2.3 dB.
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