한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
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초음속 제트의 스크리치 톤 주파수 특성에 관한 수치적 연구

NUMERICAL STUDY ON THE FREQUENCY CHARACTERISTICS OF SCREECH TONE IN A SUPERSONIC JET

  • 김용석 (순천대학교 기계우주항공공학부) ;
  • 유기완 (전북대학교 기계항공시스템공학부) ;
  • 황창전 (한국항공우주연구원) ;
  • 이덕주 (한국과학기술원 항공우주공학)
  • 발행 : 2007.03.31
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초록

An axisymmetric supersonic screeching jet is numerically simulated to examine the length scales of screech frequency as well as screech tone generation mechanism. The axisymmetric Reynolds-averaged Navier-Stokes equations in conjuction with a modified Spalart-Allmaras turbulence model are employed. It is demonstrated that the axisymmetric jet screech tones can be simulated correctly and the numerical results are in good agreement with the experimental data. Instability waves, shock-cell structures and the phenomena of shock motion are investigated in detail to identify the screech tone generation mechanism. Shock spacings and standing wave length are analyzed to determine the dominent length scale crucial to the screech frequency formulation.

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참고문헌

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