| Citation: | YANG K L，HAN D. Influence of rotor/wing aerodynamic interference on performance of compound helicopters[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（7）：1761-1771 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0561
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To investigate the influence of rotor/wing aerodynamic interference on the high-speed flight performance of a dual-propeller propelled compound helicopter, a flight performance prediction model of compound helicopters is established. Taking the AS365N ‘Dolphin’ helicopter equipped with a wing and propeller as an example, the influence and mechanism of rotor/wing aerodynamic interference on the flight performance are investigated at a high speed of 400 km/h. The change rule of the helicopter power is investigated when the aileron control is utilized to trim the wing rolling moment caused by the aerodynamic interference. The studies indicate that the aerodynamic interference increases the induced velocity of the wing, resulting in a decrease in the lift coefficient and an increase in the drag coefficient of the wing. Due to the asymmetrical vortex of main rotor, the induced velocity, lift and drag coefficients of the wing under the advancing side of the rotor change more significantly than those on the retreating side. Aerodynamic interference decreases the wing lift share from 80.00% to 71.59%, and increases the rotor lift share from 20.04% to 28.48%. The power of the main rotor, propeller and helicopter is increased by 16.60%, 1.86% and 3.76% respectively. Aerodynamic interference increases the wing rolling moment and decreases the main rotor rolling moment, which is conducive to the aircraft trim, but is inconducive for the power reduction of the aircraft. When the aileron is utilized to balance the wing rolling moment caused by the aerodynamic interference, the lateral cyclic pitch and drag of main rotor are reduced, and hence the aircraft power is decreased.
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