Numerical Simulations of an Unsteady Shock Wave Propagating into a Helmholtz Resonator

Helmholtz 공명기 내부를 전파하는 비정상 충격파의 수치해석

  • 이영기 (안동대학교 기계공학부) ;
  • 권용훈 (일본 큐슈대학 총합이공학 연구과) ;
  • 신현동 (안동대학교 기계공학부 대학원) ;
  • 김희동 (안동대학교 기계공학부) ;
  • 청목준지 (일본 큐슈대학 총합이공학 연구과)
  • Published : 2004.04.28

Abstract

When a shock wave propagates into a Helmholtz resonator, very complicated wave phenomena are formed both inside and outside the resonator tube. Shock wave reflection, shock focusing phenomena and shock-vortex interactions cause strong pressure fluctuations inside the resonator, consequently leading to powerful sound emission. In the present study, the wave phenomena inside and outside the Helmholtz resonator are, in detail, investigated with a help of CFD. The Mach number of the incident shock wave is varied below 2.0 and several types of resonators are tested to investigate the influence of resonator geometry on the wave phenomena. A TVD scheme is employed to solve the axisymmetric, compressible, Euler equations. The results obtained show that the configuration of the Helmholtz resonator significantly affects the peak pressure of shock wave focusing, its location, the amplitude of the discharged wave and resonance frequency.

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