Transactions of the Korean Society of Mechanical Engineers (대한기계학회논문집)
- Volume 19 Issue 4
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- Pages.1102-1115
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- 1995
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- 1225-5963(pISSN)
DOI QR Code
Effect Of The Separating Shear Layer on the Flow Over an Axisymmetric Backward-Facing Step
박리전단층이 축대칭 하향단흐름에 미치는 영향
Abstract
An experimental study on the flow over the axisymmetric backward-facing step was carried out. The purpose of the present study is to investigate the effect of the boundary layer thickness at the separation point on the reattachment length and to understand the structure of the recirculating flows. Local mean and fluctuating velocity components were measured in the separating and reattaching axisymmetric turbulent boundary layer over the wall of convex cylinder placed in a water tunnel by using 2-color 4-beam fiber optics laser Doppler velocimetry. The study demonstrated that the reattachment length increases with increasing boundary layer thickness. It was also observed that the reverse flow velocity and turbulent kinetic energy decrease with an increase in the momentum thickness at the separation point. The measured velocity field suggests that the boundary layer thickness at the separation can affect definitely on the formation of corner eddy.
Keywords
- Axisymmetric Backward-Facing Step;
- LDV Measurement;
- Sparating Shear Layer;
- Boundary layer Thickness;
- Recirculating Zone
- 축대칭 하향단;
- 레이저 유속계 측정;
- 박리전단층;
- 경꼐층두께;
- 재순환영역;