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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Magnus effect on a rotating sphere at high Reynolds numbers
Abstract Aerodynamic force measurements and a flow field survey were carried out on a sphere rotating perpendicular to the flow direction in order to investigate the effect of the rotation on the flow parameters at Reynolds numbers in the range of 0.68×105<Re D<5.07×105. Experiments were performed using a support system based on the classic approach of a rod driving the sphere. Additionally, an innovative rear sting support was developed where the sphere was split into two hemispheres that were driven by a motor inside them. The results show considerable changes of the mean force coefficients with Reynolds number Re D and spin parameter SP, which can be attributed to the altered boundary layer separation. These changes also lead to significant changes of size and orientation of the wake zones. A negative Magnus effect occurs in a wide range of Reynolds numbers Re D and spin parameters SP.
Highlights ► Experimental investigation of the Magnus effect on rotating spheres. ► Examination of high Reynolds numbers. ► Effect of rotation on boundary layer separation. ► Visualization of the negative Magnus effect. ► Effect of support interference on boundary layer separation.
Magnus effect on a rotating sphere at high Reynolds numbers
Abstract Aerodynamic force measurements and a flow field survey were carried out on a sphere rotating perpendicular to the flow direction in order to investigate the effect of the rotation on the flow parameters at Reynolds numbers in the range of 0.68×105<Re D<5.07×105. Experiments were performed using a support system based on the classic approach of a rod driving the sphere. Additionally, an innovative rear sting support was developed where the sphere was split into two hemispheres that were driven by a motor inside them. The results show considerable changes of the mean force coefficients with Reynolds number Re D and spin parameter SP, which can be attributed to the altered boundary layer separation. These changes also lead to significant changes of size and orientation of the wake zones. A negative Magnus effect occurs in a wide range of Reynolds numbers Re D and spin parameters SP.
Highlights ► Experimental investigation of the Magnus effect on rotating spheres. ► Examination of high Reynolds numbers. ► Effect of rotation on boundary layer separation. ► Visualization of the negative Magnus effect. ► Effect of support interference on boundary layer separation.
Magnus effect on a rotating sphere at high Reynolds numbers
Kray, Thorsten (Autor:in) / Franke, Jörg (Autor:in) / Frank, Wolfram (Autor:in)
09.07.2012
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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