한국전산유체공학회:학술대회논문집

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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Noise Reduction of Blade Vortex Interaction Using Tip Jet Blowing

  • Yang Choongmo (Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Baek Jehyun (Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Saito Shigeru (Rotary Wing Research Group, National Aerospace Laboratory) ;
  • Aoyama Takashi (Rotary Wing Research Group, National Aerospace Laboratory)
  • Published : 2003.10.01
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Abstract

Nnumerical investigations of the tip vortical characteristics were conducted with lateral tip blowing to reduce Blade-Vortex Interaction (BVI) noise. The predictions of BVI noise were performed using a combined method of an unsteady Euler code with an aeroacoustic code based on Ffowcs- Williams and Hawkings formulation. A moving overlapped grid system with three types of grids (blade grid, inner and outer background grid) was used to simulate BVI of helicopter with two OLS-airfoil blades in forward/ descending flight condition. The calculated waveform of BVI noise, which is characterized by the distinct peaks caused during blade vortex interaction, clearly shows the effect of lateral blowing at tip to reduce BVI noise

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