| Citation: | FENG Heying, CUI Panwang, TONG Fan, et al. Influence mechanism of different axial spacings on aerodynamic and acoustic characteristics of counter-rotating propeller[J]. Journal of Aerospace Power, 2024, 39（X）：20220838 doi: 10.13224/j.cnki.jasp.20220838
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Based on the nonlinear harmonic method and acoustic analogy theory, the influences of rotor axial spacing on the aerodynamic characteristics and noise of counter-rotating propeller and its physical mechanism were studied. Taking a certain type of counter-rotating propeller as the research object, six kinds of counter-rotating propeller models with different rotor axial spacings were studied. The calculation results showed that change of the axial spacing of the counter-rotating propeller rotor had a certain influence on the overall efficiency of the counter-rotating propeller, but had little influence on the total pull coefficient and total power coefficient. The increase of rotor axial spacing had a significant impact on the axial velocity between the front and rear rotors, but had little impact on the axial velocity of air flow behind the rotor. With the increase of the axial distance between rotors, the radial velocity between the front and rear rotors decreased gradually, and then the slipstream contraction between rotors of counter-rotating propeller was weakened. By changing the axial spacing of the rotor, compared with the minimum axial spacing, the maximum noise of the counter-rotating propeller was reduced by about 10 dB, the interference noise was reduced by more than 10 dB, and the efficiency was increased by 1.4%. With the increase of rotor axial spacing, the amplitude of the first harmonic pressure on the pressure surface and suction surface at 85% of the blade height of the front rotor decreased by 1836 Pa (89%) and 1277 Pa (90%), respectively, at the trailing edge, and the amplitude of the third harmonic pressure on the pressure surface and suction surface at 75% of the blade height of the rear rotor decreased by 266 Pa (78%) and 209 Pa (85%), respectively, at the leading edge.
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