March 6 - 8, 2017 | Berlin
LEADING ENGINEERING SIMULATION CONFERENCE
STAR-CCM+® Navier-Stokes solver has been applied to helicopter rotors in hover. Two tip planforms were analyzed: S-76 rotor with a swept tip and a swept tip with anhedral. The solidity of the three rotors was matched. Calculations have been done for a range of pitch settings. Comparisons of the measurements against computed thrust, power, and figure of merit values have been done. Where available, comparisons with other calculations. The simulations are in reasonable agreement with published data for the thrust, power, and figure of merit. The sectional load data and the inflow over the rotor disk have been analyzed to understand the physical mechanisms that cause the anhedral tip to be more efficient than a conventional swept tip. It is concluded that the rotor with the anhedral tip has a more uniform inflow over the rotor disk, reducing the induced power and the total power.