한국항공우주학회지 (Journal of the Korean Society for Aeronautical & Space Sciences)

  • 제33권7호
  • /
  • Pages.18-25
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  • 2005
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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CFD/CAA Hybrid 기법을 이용한 뒷전에서 음향파의 산란모사

Simulation of Trailing Edge Scattering Using Linearized Euler Equations with Source terms

  • 박용환 (서울대학교 기계항공공학부 대학원) ;
  • 빈종훈 (서울대학교 기계항공공학부 대학원) ;
  • 정철웅 (한국표준과학연구원 물리표준부 음향진동그룹) ;
  • 이수갑 (서울대학교 기계항공공학부)
  • 발행 : 2005.07.01
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초록

본 연구에서는 뒷전, 전단류와 초기교란의 상호작용에 의한 불안정파의 생성 기제의 분석과 뒷전 산란현상을 고차의 전산공력음향학을 이용하여 모사하였다. 수치적 알고리즘은 Hybrid 기법에 기초하였으며, Simple Linearized Euler Equation과 Full Linearized Euler Equation의 결과를 비교를 통해 정상류 구배항이 불안정파의 생성에 중요한 역할을 함을 볼 수 있었다. 또한 Full Navier-Stokes Equation을 이용한 결과와 비교함으로써, Full Linearized Euler Equation은 뒷전의 초기 근접장에서 불안정파를 해석하는데 있어서 Full Navier-Stokes Equation 보다 효율적임을 알 수 있다.

In this study, the main focus is the simulation of acoustic wave scattering in trailing edge and the analysis of the generation mechanism of instability wave by the interaction of trailing edge, shear flow and initial disturbance. The numerical algorithm is based on CFD/CAA hybrid method with high-order computational aeroacoustic method. It is found that steady mean flow gradient terms play a crucial role on the generation of instability wave through the comparison of simulations of Simple Linearized Euler Equation and Full Linearized Euler Equation. Through the comparison with the results of Full Navier-Stokes Equation, it is reasonable and efficient to use the Full Linearized Euler Equation in the initial generation mechanism of the instability wave near the trailing edge.

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참고문헌

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