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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2002.5
- 수록면
- 1,931 - 1,936 (6page)
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The effect of local forcing on the vortex pairing and the flow over a backward-facing step is investigated
through hot-wire measurements. The inlet boundary layer is laminar and the Reynolds number based on a free
stream velocity and a step height is 13800. The local forcing is given from a slit located at the step edge and
the forcing signal is always defined when the wind tunnel is in operation. In case of single frequency forcing,
the streamwise velocity and the reattachment length are measured under forcing with various forcing
frequencies. For the range of 0 013 . 0 010 . < < θ St , the forcing frequency component of the streamwise
velocity fluctuation grows exponentially and is saturated at 75 . 0 = h x , while its subharmonic component
grows following the fundamental and is saturated at 0 . 2 = h x . However, the saturated value of the
subharmonic is much lower than that of the fundamental. For double frequency forcing, natural instability
frequency is adopted as a fundamental frequency and its subharmonic is superposed to it. The fundamental
frequency component of the streamwise velocity grows exponentially and is saturated at 75 . 0 5 . 0 < < h x ,
while its subharmonic component grows following the fundamental and is saturated at 5 . 1 = h x which is
rather upstream than that for the single frequency forcing. Furthermore, the saturated value of the
subharmonic component is much higher than that for the single frequency forcing and is nearly the same or
higher than that of the fundamental. It is observed that the subharmonic component does not grow for the
narrow range of the initial phase difference. This means that there is a range of the initial phase difference
where the vortex pairing cannot be enhanced or amplified by double frequency forcing. In addition, this effect
of the initial phase difference on the development of the shear layer and the distribution of the reattachment
length shows a similar trend. From this, it can be inferred that the development of the shear layer and the
reattachment length are closely related to the vortex paring.
through hot-wire measurements. The inlet boundary layer is laminar and the Reynolds number based on a free
stream velocity and a step height is 13800. The local forcing is given from a slit located at the step edge and
the forcing signal is always defined when the wind tunnel is in operation. In case of single frequency forcing,
the streamwise velocity and the reattachment length are measured under forcing with various forcing
frequencies. For the range of 0 013 . 0 010 . < < θ St , the forcing frequency component of the streamwise
velocity fluctuation grows exponentially and is saturated at 75 . 0 = h x , while its subharmonic component
grows following the fundamental and is saturated at 0 . 2 = h x . However, the saturated value of the
subharmonic is much lower than that of the fundamental. For double frequency forcing, natural instability
frequency is adopted as a fundamental frequency and its subharmonic is superposed to it. The fundamental
frequency component of the streamwise velocity grows exponentially and is saturated at 75 . 0 5 . 0 < < h x ,
while its subharmonic component grows following the fundamental and is saturated at 5 . 1 = h x which is
rather upstream than that for the single frequency forcing. Furthermore, the saturated value of the
subharmonic component is much higher than that for the single frequency forcing and is nearly the same or
higher than that of the fundamental. It is observed that the subharmonic component does not grow for the
narrow range of the initial phase difference. This means that there is a range of the initial phase difference
where the vortex pairing cannot be enhanced or amplified by double frequency forcing. In addition, this effect
of the initial phase difference on the development of the shear layer and the distribution of the reattachment
length shows a similar trend. From this, it can be inferred that the development of the shear layer and the
reattachment length are closely related to the vortex paring.
목차
Abstract
1. 서론
2. 실험장치 및 방법
3. 실험결과
4. 결론
참고문헌
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UCI(KEPA) : I410-ECN-0101-2009-550-014201723