Quieter and Greener rotorcraft: concurrent aerodynamic and acoustic optimization

Abstract Within the DLR project VicToria an aerodynamic and aero-acoustic optimization of helicopter rotor blades is performed. During optimization, three independent flight conditions are considered: hover, cruise descent flight. The first two drive power requirements rotor, while loudest condition for current generations. To down required emitted noise, a multi-objective design approach coupled with surrogate models utilized to find Pareto optimal set rotors. This allows identify trade-offs be made when laying emphasis on either goal function. underlying CFD simulations utilize fourth-order accurate spatial schemes capture vortex dominated flow blades. paper presents validation setups, results off-design analysis chosen from front. conclusion that utilization front necessary good designs, high-order methods efficient setups.