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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한기계학회 Journal of Mechanical Science and Technology KSME International Journal Vol.17 No.8
발행연도
2003.8
수록면
1,234 - 1,245 (12page)

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초록· 키워드

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An experimental study was carried out to investigate the reduced frequency effect on the near-wake of an elliptic airfoil oscillating in pitch. The airfoil was sinusoidally pitched around
the center of the chord between -5° and +25° angles of attack at an airspeed of 3.4 m/s. The chord Reynolds number and reduced frequencies were 3.3 X 10⁴, and 0.1. 0.7, respectively. Phase-averaged axial velocity and turbulent intensity profiles are presented to show the reduced frequency effects on the near-wake behind the airfoil oscillating in pitch. Axial velocity defects in the near-wake region have a tendency to increase in response to a reduced frequency during pitch up motion, whereas it tends to decrease during pitch down motion at a positive angle of attack. Turbulent intensity at positive angles of attack during the pitch up motion decreased in response to a reduced frequency, whereas turbulent intensity during the pitch down motion varies considerably with downstream stations. Although the true instantaneous angle of attack compensated for a phase-lag is large, the wake thickness of an oscillating airfoil is not always large because of laminar or turbulent separation.

목차

Abstract

1.Introduction

2.Experimental Set-up and Procedure

3.Results and Discussion

4.Conclusions

Acknowledgment

References

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