同軸反転ロータ系の最良ホバリング性能と最適荷重分担

抄録

The experimental investigations were carried out to explore the wake-rotor interference effects on the however performance of the co-axial rotor.
The effect of various combinations of variable geometry parameters such as the axial spacing and the pitch difference between rotors on the hover performance were systematically tested.
Flow visualization testings were also conducted to clarify the relationships between the rotor performance and the tip vortex behaviours at the near wake of each rotor.
It was found that the performance of co-axial rotor was largely depended on these parameters and there was the optimum combination of the parameters which could offer more efficient performance than a single rotor one.
It was also shown that the optimum pitch difference and the load sharing of the rotor had a unique property to define the optimum condition of the co-axial rotor.
The possibility to improve the hover performance might be originated from the fact that the co-axial rotor arrangement could alleviate the wake-rotor interference effects by the relocation of the tip vortex in the near wake structure.