关键词：
Phase control
摘要：
Propeller phase control technology is an effective active noise control method for turboprop aircraft. Current research on this technology primarily relies on theoretical analysis and experimental studies,which have certain limitations in revealing flow field details and understanding noise reduction mechanisms. An improved delayed detached eddy simulation (IDDES) combined with the Ffowcs Williams-Hawkings (FW-H) acoustic analogy method was employed to conduct phase control noise reduction research on a scaled twin-propeller model of a specific turboprop aircraft. Detailed analysis of the impact of phase angle differences on the noise reduction performance of a twin-propeller system was conducted, offering an in-depth exploration of the flow mechanisms associated with propeller phase control. The results indicated that the numerical method used can effectively simulate the phase control noise reduction effects of twin engines. By adjusting the phase angle differences between the propellers,a significant reduction in noise levels was achieved at specific observation points. For instance, at the midpoint of the shaft line in the twin-propeller disk plane,when the phase angle difference was set to 30°, the overall sound pressure level at this observation point was reduced by 15.37 dB compared with 0° phase angle difference. The pressure and density fluctuation amplitudes at this point were significantly reduced, demonstrating the typical phase control noise reduction characteristic of interference cancellation between high and low-pressure areas. The distribution of pressure and density fluctuations on the disk plane exhibited a swirling petal-like radiation pattern. Further analysis showed that as the phase angle difference between the twin propellers increased,the thickness noise and loading noise components at the midpoint of the centerline between the propellers first decreased and then increased,reaching their minimum values at a phase angle difference of 30°. © 2
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