共轴高速直升机反流区翼型设计及减阻机理

doi:10.7527/S1000-6893.2023.29960

Abstract

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:

V275.1

Xuehe WANG, Chunshuo CHAI, Shilong XING, Feng FAN, Shuilin HUANG. Design of coaxial high⁃speed helicopter airfoil in reverse flow region and its drag reduction mechanism[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(9): 529960-529960.

Figures/Tables 22

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网格量/10⁴	α/（°）	C_D
2.8	0	0.020 10
5.65	0	0.021 90
11.2	0	0.021 81

站位/R	相位/（°）	Ma	α/（°）	C_L
0.32	0	0.172	0.44	0.69
0.32	90	0.504	0.78	0.11
0.32	180	0.167	10.56	0.69
0.32	270	0.176	-158.7	-1.17

序号	Ma	C_L	obj
1	0.3	0.9	C_D
2	0.5	0.4	C_p_tar
3	0.15	-0.4	C_p_tar

序号	Ma	C_L	s.t.
1			t/c=0.26±0.003
2	0.3	0.9	C_m <C_m₀
3	0.15	-0.4	C_D <C_D₀

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

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