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On the Generation and Subsequent Development of Spiral Vortex Flow over a Swept-Back Wing,

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An experimental investigation has been performed to study the formation and development of spiral vortex flow over a swept-back wing. An aerofoil section with three alternative leading edge shapes was tested at sweep angles ranging from 0 deg to 56 deg for unit Reynolds number of 1000000m and 2000000m. The principal diagnostic tool was the surface oil-flow visualization technique supplemented by pressure distribution measurements in certain cases. No spiral vortex flow was observed for sweep angles of 0 deg and 15 deg but at higher sweep angles the oil-flows indicated that there were three different mechanisms for the formation of spiral vortices. The angle of incidence at the onset of vortex flow, and the mechanism responsible for its formation, were found to depend upon the sweep angle, the leading edge shape and the Reynolds number. It was also noted that the larger the leading edge radius the greater the dependence upon Reynolds number. However comparison with other work suggests that Reynolds number, incidence and sweep angle alone are insufficient to determine the type of spiral vortex flow occurring on a given wing. Author

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This article is from 'Aerodynamics of Vortical Type Flows in Three Dimensions: Conference Proceedings Held at Rotterdam, Netherlands on 25-28 April 1983,' AD-A135 157, p6-1-6-14.



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