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Acta Aeronautica et Astronautica Sinica ›› 2026, Vol. 47 ›› Issue (3): 132182.doi: 10.7527/S1000-6893.2025.32182

• Fluid Mechanics and Flight Mechanics • Previous Articles    

Experiment on influence mechanism of rotor flow on blade-vortex interaction noise

Wei SUN1(), Yuni ZHANG1, Ting LIU2, Zheyu SHI3, Yongfeng LIN1   

  1. 1.National Key Laboratory of Helicopter Aeromechanics,China Helicopter Research and Development Institute,Jingdezhen 333001,China
    2.Aerospace Times FeiHong Technology Company Limited,Beijing 100094,China
    3.China Aerodynamics Research and Development Center,Mianyang 621000,China
  • Received:2025-04-29 Revised:2025-05-19 Accepted:2025-06-13 Online:2025-07-18 Published:2025-07-03
  • Contact: Wei SUN E-mail:sunw017@avic.com
  • Supported by:
    National Key Laboratory of Helicopter Aeromechanics Funding(2024-CXPT-GF-JJ-093-05)

Abstract:

The Blade-Vortex Interaction (BVI) noise of helicopter rotor is a severe impulsive noise source. In order to investigate the influence mechanism of the unsteady flow of the rotor on the BVI noise characteristics, the noise characteristics, pressure distribution, and unsteady flow characteristics of the different rotor conditions are measured based on the microphone spherical array measurement technology, the blade surface pressure measurement technology, and the Particle Image Velocimetry (PIV) technology in an acoustic tunnel environment. The influences of the advance ratio,oblique descent angle, and lift coefficient on the BVI noise are obtained. The influence mechanism of the rotor surface pressure and the vortex motion trajectory on the BVI noise are revealed. The analysis results show that the main radiation direction of BVI noise covers most of the first to third quadrants. In the time domain, it shows a high peak pulse noise pressure, and the main sound energy frequency is concentrated on the multiples of the rotational frequency in the medium- and high-frequency bands. The BVI noise mainly occurs at the blade leading edge, generally within 0.3 times of the chord length, with intensity inversely proportional to the distance. Upper and lower surface interaction loads exhibit opposing impulsive directions. For 5-bladed rotors, parallel BVI phases approximate 60°. Spanwise cumulative noise effects arise from extensive BVI during parallel BVI. The change of the rotor advance ratio and oblique descent angle will cause the change of the flow near the rotor, which will change the motion trajectory of the blade tip vortex, and then change the relative angle, distance, and interference phase between the blade and the vortex, thus affecting the BVI noise. Vertical force coefficient modifications impact vortex strength rather than trajectory, which directly influence BVI noise intensity.

Key words: rotor, Blade-Vortex Interaction (BVI) noise, pressure measurement, PIV, influence mechanism, wind tunnel test

CLC Number: