| Citation: | HE Xiang, ZHAO Zhenguo, SHU Taibo, et al. Numerical investigation of noise reduction law and acoustic mecha-nism of the sweepback propfan[J]. Journal of Aerospace Power, 2023, 38（4）：939-948 doi: 10.13224/j.cnki.jasp.20210214
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The propfan flow-field and acoustic features were investigated by combining the 3D numerical simulation with Ffowcs Williams-Hawkings equation. And the effects of propfan sweepback angle on aerodynamic performance and noise level were studied. It indicated that, with propfan sweepback angle increasing from 0° to 40°, the thrust efficiency was promoted about 1.5 percentage points at the high speed cruise condition but slightly at the take-off condition. The propfan noise level was directly related to the pressure fluctuation intensity of the rear blade suction surface. With the increase of sweepback angle, the pressure fluctuation intensity decreased, and then the noise level in all angular positions was reduced at the take-off condition. At the 75° angular position with the maximum sound pressure level, the sound pressure level decrease by more than 3 dB with propfan sweepback angle increasing from 0° to 40°.
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