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Drag Reduction on a Square Prism Using a Detached Splitter Plate

분리된 분할판에 의한 정방형주의 항력감소

  • 노기덕 (경상대학교 기계시스템공학과.해양산업연구소) ;
  • 윤성민 (경상대학교 기계시스템공학과) ;
  • 최동현 (경상대학교 기계시스템공학과) ;
  • 김재현 (경상대학교 기계시스템공학과) ;
  • 심은총 (경상대학교 기계시스템공학과)
  • Received : 2012.06.08
  • Accepted : 2012.09.17
  • Published : 2012.09.30

Abstract

The Characteristics of the drag reduction of a square prism having a detached splitter plate at the wake side were investigated by measuring of lift and drag on the square prism. The experimental parameters were the width ratios(H/B=0.5~1.5) of splitters to the prism width and the gap ratios (G/B=0~2) between the prism and the splitter plate. As the results the amplitude of the lift on the square prism having a detached splitter plate was remarkably decreased by comparison with the prototypical square prism. The drag reduction rate of the square prism was increased with H/B in case of the same G/B, and was increased and decreased with G/B in case of the same H/B. The maximum drag reduction rate was represented by 24.2% at H/B=1.5 and G/B=0.5.

본 연구는 정방형주의 후류측으로 분리된 분할판(Detached splitter plate)을 설치한 경우 정방형주의 항력저감특성을 분할판의 폭과 정방형주 후면에서부터 분할판까지의 간격을 변수로 하여 양 항력측정 실험으로 파악한 것이다. 그 결과를 요약하면 다음과 같다. 양 항력의 시간변화를 측정해 본 결과 정방형주의 후류측에 분리된 분할판을 설치한 경우가 본래의 정방형주에 비해 양력의 진폭이 대폭 감소했다. 분할판의 폭비를 고정시킨 경우 정방형주의 항력감소율은 간격비가 증가할수록 증가하다 감소하는 특성을 보였다. 같은 간격비에서는 분할판의 폭비가 클수록 정방형주의 항력감소율이 컸으며, 폭비 H/B=1.5, 간격비 G/B=0.5에서 최대 24.2%의 항력감소율을 보였다.

Keywords

References

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