Noise reduction of the unmanned aerial vehicle rotor with wavy tip structure

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (22) : 135-145.

ZHANG Xiaozheng*，WANG Yajie，LI Jiazhu，BI Chuanxing，XU Ying

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Abstract

As an important source of unmanned aerial vehicle noise, reducing the aerodynamic noise of rotor is of great significance to improve public's acceptance of unmanned aerial vehicle. In view of this, a rotor design scheme with wavy-shaped blade tip structure was proposed. This scheme only used a specific wave line type as the wire for lofting design at the blade tip of the rotor. At the same time, the three characteristics of wavy-shaped leading edge, wavy-shaped trailing edge and wavy surface structure were coupled. This scheme can reduce the noise and retain the aerodynamic performance to the greatest extent. Then, the influence of wavy blade tip structure on rotor aerodynamic performance and aerodynamic noise were analyzed with computational fluid dynamics simulation and experimental research. The noise reduction mechanism was revealed, and the parameter optimization design of wavy tip was carried out. The simulation and experimental results showed that the rotor with wavy tip structure still has good aerodynamic performance. In terms of acoustic performance, the wavy blade tip structure reduced the broadband noise in the middle and high frequency ranges of the rotor. The rotor with waveform parameter N=8 has the best noise reduction effect, and the noise reduction was significant near the downwash flow of the rotor. The total sound pressure level was 1.5~4 dB lower than that of the Base rotor.

Key words

unmanned aerial vehicle rotor / noise reduction design / aerodynamic performance / aerodynamic noise / computational fluid dynamics simulation

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ZHANG Xiaozheng, WANG Yajie, LI Jiazhu, BI Chuanxing, XU Ying. Noise reduction of the unmanned aerial vehicle rotor with wavy tip structure[J]. Journal of Vibration and Shock, 2024, 43(22): 135-145

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