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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (9): 529960-529960.doi: 10.7527/S1000-6893.2023.29960

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Design of coaxial high⁃speed helicopter airfoil in reverse flow region and its drag reduction mechanism

Xuehe WANG(), Chunshuo CHAI, Shilong XING, Feng FAN, Shuilin HUANG   

  1. China Helicopter Research and Development Institute,Jingdezhen 333000,China
  • Received:2023-12-11 Revised:2024-01-07 Accepted:2024-03-05 Online:2024-05-15 Published:2024-03-13
  • Contact: Xuehe WANG E-mail:wangxh183@avic.com
  • Supported by:
    Shared Technology Project(50906010501)

Abstract:

Higher speed is the development tendency of helicopters in the future. Considering the wide region reverse flow of coaxial high-speed helicopters, a design of the airfoil in reverse flow region is proposed. Firstly, the flow characteristics surrounding the blunt trailing edge airfoil and the drag reduction mechanism deployed in the root of the rotor in high-speed forward flight are analyzed. Then, a blunt trailing edge airfoil characterized by large radius in the leading edge and smooth in the middle and rear parts of the suction surface is developed, in consideration of the reverse flow environment of the rotor. Compared with the standard elliptic airfoil, the modified airfoil improves the flow separation in both reverse flow and forward flow, with the drag coefficient decreasing more than 10% atMach number 0.1 in the reverse flow. Based on the modified airfoil, airfoil hybrid inverse design and design optimization are carried out considering the flow characteristics in the suction surface.Results indicate that the optimized airfoil maintains low drag coefficient in the reverse flow, and the lift-drag characteristic is promoted in the forward flow observably.

Key words: coaxial, high-speed helicopter, airfoil design, drag reduction, flow separation

CLC Number: