Planform Design for a Five Bladed Isolated Helicopter Rotor Using Fluid-Structure Coupled CFD Simulations

摘要

The planform of a helicopter rotor blade is studied by describing the blade tip with eight parameters. The effect of those parameters on the performance of the isolated five bladed rotor in cruise speed condition is analysed using the lift over drag ratio as quality criterion. Trimmed and fluid-structure coupled Computational Fluid Dynamics computations are required to account for the deformation of the rotor blades as well as to obtain a steady flight state necessary for comparing different blade shapes with each other. The parametric domain is systematically investigated and areas with beneficial effect on the forward flight performance are identified. Improvements of up to 5 % compared to a rectangularly shaped reference blade with the same thrust weighted equivalent chord are achieved.