Rotorcraft are facing multiple adverse phenomena which are directly linked to the strong, concentrated blade tip vortices trailed from the main rotor. Such phenomena include, but are not limited to, high induced vibratory structural loads, blade-vortex interaction (BVI) noise, and rotorcraft brownout. In order to mitigate these adverse effects, one possible way is to modify the vortex structure to significantly diffuse the concentrated vorticity [1, 2]. Passive systems, such as blade planform optimizations, do not need a control logic or energy supply, and thus promise to have an advantage over active systems in terms of weight, cost, and reliability.
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