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벽면의 형상 변화에 의한 난류 드래그 관련 Pocket Length Scale 저감연구

원문정보

A Reduction Study of Pocket Length Scale Involved in Turbulence Drag by Wall Modification

유성출, 조장현

피인용수 : 0(자료제공 : 네이버학술정보)

초록

영어

The flow-surface interaction and resulting pockets is the case of a turbulence boundary layer. Conditionally sampled hot-wire measurements within the wall region show that a strong vortex forms within the pocket, bordering the upstream portion, which stay in the wall region. This vortex is the result of the rearrangement of existing sublayer vorticity and its amplification. The work in this area has been applied to the prediction and reduction of drag. The study is focused on determining change in the length scale of the pockets. An important relationship between pocket and modified wall has been found. By changing the upstream boundary condition at the wall, the length scale of pockets were decreased.

목차

ABSTRACT
기호설명
1. 서론
2. 실험장치 및 방법
2.1 저속 풍동
2.2 가시화 마커 분사
2.3 밝은 조명
2.4 고속 사진촬영 시스템
2.5 속도 데이터 취득 시스템
2.6 벽면의 형상 변화
2.7 평균속도 프로파일 데이터 처리 기술
2.8 가시화 데이터
2.9 포켓 측정방법
3. 결과 및 고찰
3.1 평균속도 프로파일 데이터
3.2 포켓 length scale
4. 결론
References

저자정보

  • 유성출 Seoung-Chool Yoo. Professor, Dept. of mechanical & automotive Engr., Halla University
  • 조장현 Jang-Hyen Jo. Member, Professor, Dept. of mechanical & automotive Engr., Halla University

참고문헌

자료제공 : 네이버학술정보

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