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

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Blockage Correction Method for Separated Flows over an Aircraft in a Closed Test-Section Wind Tunnel

폐쇄형 풍동 시험부내의 항공기 실속 흐름에 대한 Blockage 보정 기법 연구

  • Published : 2005.08.01
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Abstract

A new blockage correction method has been developed for the wall interference correction of closed test-section subsonic wind tunnels based on the nonlinear relationship between separation blockage and separation drag. This method can be applied continuously from the linear lift-slope region to the highly nonlinear post-stall region by on-line processing. The present method was validated by comparing the results with a classical method based on the test results of a bluff body and a measured-boundary-condition method. It was shown that the present method is in good agreement with the measured-boundary-condition method, enabling better wall corrections than the bluff body method in both near-stall and post-stall regions.

아음속풍동 폐쇄형 시험부의 벽면효과 보정을 위한 새로운 blockage 보정 기법을 개발하였다. 개발된 보정 기법은 실속항력계수와 separation blockage의 비선형 관계를 이용하여 선형 양력곡선 기울기 영역에서 후실속 영역까지 실시간으로 보정이 가능하게 하였다. 본 연구에서 제시한 방법은 bluff body 시험 결과를 사용하는 고전적 방법과 벽면압력측정 방법과 비교하여 그 타당성을 검증하였다. 그 결과 본 연구에서 제시한 보정 방법은 실속 및 후실속 영역에서 bluff body 방법보다 우수한 보정 결과를 보이며 벽면압력측정 방법과 같은 정확도로 보정됨을 확인할 수 있었다.

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References

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