Effect of Tripping Wires on the Flow around a Circular Cylinder Normal to an Airstream

Experimental studies have been made to make clear the effect of tripping wires on the transition in a boundary layer on a circular cylinder in a cross flow. The flow patterns are variable according to the angle φR, namely, a contact point of the tangent to the cylinder from the top of the roughness,...

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Bibliographic Details
Published in:Bulletin of JSME 1986, Vol.29(255), pp.2917-2924
Main Author: IGARASHI, Tamotsu
Format: Article
Language:English
Subjects:
Boundary Layer
Boundary Layer Control
Circular Cylinder
Drag Coefficient
Flow Separation
Fluid Mechanics
Strouhal Number
Transition
Trippng Wires
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Summary:Experimental studies have been made to make clear the effect of tripping wires on the transition in a boundary layer on a circular cylinder in a cross flow. The flow patterns are variable according to the angle φR, namely, a contact point of the tangent to the cylinder from the top of the roughness, and to the roughness Reynolds number Rek, defined by the roughness height and the velocity at the outer edge of the boundary layer. In the range of φR < 70°, the roughness has no influence on the transition up to Rek =620, while, at Rek≥1220, it is found to has full effect on the transition. In this case, the Strouhal number S increases to 0.30 and the drag coefficient CD decreases to 0.60. In the range of 70°≤φR≤75°, the transition occurs at Rek = 620. Beyond φR =76°, the flow is separated by the roughness, and the values of S and CD are about 0.175 and 1.55, respectively.
ISSN:0021-3764
1881-1426
DOI:10.1299/jsme1958.29.2917