Aeroacoustic calculation for helicopter rotor in hover and in forward flight based on FW-H equation

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24 Scopus citations

Abstract

The Ffowcs Williams/Hawkings (FW-H) equation, which is directly derived from Navier-Stokes equations, has been the theoretical background of predicting the noise generated by moving bodies. For predicting the rotor noise, in the conventional solution of FW-H equation, the blade is utilized as the integration surface, and the complication is caused when calculating the quadrupole noise. In the present work, a form of FW-H equation applied for a permeable surface was employed for predicting the quadrupole noise aerodynamically generated by rotor both in hover and forward flight. Section 1 discusses the CFD calculation performed by solving the 3-D unsteady Euler's equations. Section 2 describes in detail the solution of the permeable-surface FW-H equation in the time domain. The computed results for all cases were compared with experimental data and a reasonable agreement has been achieved. It is also shown that the developed code is efficient and is capable of capturing the nonlinear quadrupole noise for transonic rotor.

Original languageEnglish
Pages (from-to)400-404
Number of pages5
JournalHangkong Xuebao/Acta Aeronautica et Astronautica Sinica
Volume24
Issue number5
StatePublished - Sep 2003

Keywords

  • Aeroacoustics
  • Ffowcs Williams/Hawkings equation
  • Rotor
  • Unsteady Euler's equations

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