Volume 36 Issue 7
Jul.  2021
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Article Navigation >  Journal of Aerospace Power  > 2021  >  36(7): 1417-1425
ZHANG Wei, WANG Fei, ZHAO Qijun. Method on helicopter BVI noise reduction based onmiss-distance control[J]. Journal of Aerospace Power, 2021, 36(7): 1417-1425. doi: 10.13224/j.cnki.jasp.20200433
Citation: ZHANG Wei, WANG Fei, ZHAO Qijun. Method on helicopter BVI noise reduction based onmiss-distance control[J]. Journal of Aerospace Power, 2021, 36(7): 1417-1425. doi: 10.13224/j.cnki.jasp.20200433
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Method on helicopter BVI noise reduction based onmiss-distance control

doi: 10.13224/j.cnki.jasp.20200433

  • 1. National Laboratory of Science and Technology on Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

  • 2. China Helicopter Research and Development Institute, Aviation Industry Corporation of China, Limited, Jingdezhen Jiangxi 333001, China

  • Received Date: 2020-10-18
  • Publish Date: 2021-07-28
    Abstract
  • A method for calculating the miss-distance of helicopter rotor was proposed. For the calculation of miss-distance, rotor inflow and tip-path-plane angle were required firstly. The rotor coupled N-S(Navier-Stokes )/free-wake model and rotor trim model of high accuracy and high efficiency were developed respectively. The method was validated using several numerical examples in both hover and forward flight. Applying the developed method, the effect mechanism of longitudinal forces and flight parameters on miss-distance was analyzed. Further, the ground noise radiated from the helicopter rotor was calculated. It demonstrated that the maximum ground noise was reduced by 4dB through the longitudinal forces and acceleration. At the same time, the relationship between miss-distance and flight parameters was studied and some instructive conclusions for low-noise flight were obtained.

     

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