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Penna, P.J. (author), Beyers, M.E. (author)A flow visualization study was undertaken to investigate the unobstructed vortical flows generated by a cone-cylinder model in steady coning motion at high angle of attack. Using an orbital platform apparatus in a water tunnel, spatial measurements of vortex breakdown could be made with and without a rotary support sector downstream of the model...report 1994
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Beyers, M.E. (author), Cai, H.J. (author), Penna, P.J. (author)The interference flow field associated with an asymmetrical strut-mounted aircraft model was studied visually and through floor pressure measurements in a low-speed wind tunnel. The work was undertaken to shed light on the unsteady interference phenomena which are expected to prevail in oscillatory tests. The conditions under which direct...report 1993
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Huang, X.Z. (author), Beyers, M.E. (author)A new concept is introduced for large-amplitude nonplanar testing at high incidence. The dynamic test apparatus is characterized by an annular, orbital platform on which the model support and secondary drive mechanisms are mounted. The device can be used as a rotary apparatus, while arbitrary epicyclic motions (including fixed-plane, orbital...report 1988
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Beyers, M.E. (author)This paper presents a review and extension of methods for determining the effects of sting oscillations on the measurement of dynamic moment derivatives, based on linear as well as nonlinear models. It is shown that two of the linearized methods will reduce to the same result, applicable to low-lift configurations and suitable for on-line data...report 1983