A dynamic inflow model is used to calculate minimum induced power for a helicopter in high-speed forward flight with a finite number of blades. Comparisons between analytical and numerical results are shown, and they show good agreement. Different flow conditions (such as with and without reverse flow or inflow feedback) are used to show how each condition affects optimum induced power. Several results confirm the findings of earlier investigations, such as a singularity in rotor power in reverse flow and induced power reduction with an increase in blade number. One of the new findings is that the induced power is affected by rotor solidity (in the absence of inflow feedback) and the effect of inflow feedback does not always reduce the induced power. Results obtained using higher harmonic blade pitch control show that induced power can thereby be reduced for all conditions with a finite number of blades.
Minimum Induced Power for a Rotor with a Finite Number of Blades
Journal of Aircraft ; 55 , 2 ; 652-659
2017-08-30
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch